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Provide tags and a correct Python 3 solution for this coding contest problem.
A has a string consisting of some number of lowercase English letters 'a'. He gives it to his friend B who appends some number of letters 'b' to the end of this string. Since both A and B like the characters 'a' and 'b', they have made sure that at this point, at least one 'a' and one 'b' exist in the string.
B now gives this string to C and he appends some number of letters 'c' to the end of the string. However, since C is a good friend of A and B, the number of letters 'c' he appends is equal to the number of 'a' or to the number of 'b' in the string. It is also possible that the number of letters 'c' equals both to the number of letters 'a' and to the number of letters 'b' at the same time.
You have a string in your hands, and you want to check if it is possible to obtain the string in this way or not. If it is possible to obtain the string, print "YES", otherwise print "NO" (without the quotes).
Input
The first and only line consists of a string S ( 1 ≤ |S| ≤ 5 000 ). It is guaranteed that the string will only consist of the lowercase English letters 'a', 'b', 'c'.
Output
Print "YES" or "NO", according to the condition.
Examples
Input
aaabccc
Output
YES
Input
bbacc
Output
NO
Input
aabc
Output
YES
Note
Consider first example: the number of 'c' is equal to the number of 'a'.
Consider second example: although the number of 'c' is equal to the number of the 'b', the order is not correct.
Consider third example: the number of 'c' is equal to the number of 'b'.
Tags: implementation
Correct Solution:
```
s = input()
i1 = 0
i = 0
while s[i] == "a":
i += 1
i1 += 1
if i == len(s):
break
i2 = 0
if i != len(s):
while s[i] == "b":
i += 1
i2 += 1
if i == len(s):
break
i3 = 0
if i != len(s):
while s[i] == "c":
i += 1
i3 += 1
if i == len(s):
break
if i == len(s) and i1 > 0 and i2 > 0 and (i3 == i1 or i3 == i2):
print("YES")
else:
print("NO")
```
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
A has a string consisting of some number of lowercase English letters 'a'. He gives it to his friend B who appends some number of letters 'b' to the end of this string. Since both A and B like the characters 'a' and 'b', they have made sure that at this point, at least one 'a' and one 'b' exist in the string.
B now gives this string to C and he appends some number of letters 'c' to the end of the string. However, since C is a good friend of A and B, the number of letters 'c' he appends is equal to the number of 'a' or to the number of 'b' in the string. It is also possible that the number of letters 'c' equals both to the number of letters 'a' and to the number of letters 'b' at the same time.
You have a string in your hands, and you want to check if it is possible to obtain the string in this way or not. If it is possible to obtain the string, print "YES", otherwise print "NO" (without the quotes).
Input
The first and only line consists of a string S ( 1 ≤ |S| ≤ 5 000 ). It is guaranteed that the string will only consist of the lowercase English letters 'a', 'b', 'c'.
Output
Print "YES" or "NO", according to the condition.
Examples
Input
aaabccc
Output
YES
Input
bbacc
Output
NO
Input
aabc
Output
YES
Note
Consider first example: the number of 'c' is equal to the number of 'a'.
Consider second example: although the number of 'c' is equal to the number of the 'b', the order is not correct.
Consider third example: the number of 'c' is equal to the number of 'b'.
Tags: implementation
Correct Solution:
```
state = 1
s = input()
if ((s.count('a') == 0) or (s.count('b') == 0) or ((s.count('c') != s.count('a') and (s.count('c') != s.count('b'))))):
print('NO')
exit()
for el in s:
if el == 'b':
state = max(state, 2)
if el == 'c':
state = max(state, 3)
if state != 1 and el == 'a':
print("NO")
exit()
if state != 2 and el == 'b':
print("NO")
exit()
if state != 3 and el == 'c':
print("NO")
exit()
print("YES")
```
| 56,910
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
A has a string consisting of some number of lowercase English letters 'a'. He gives it to his friend B who appends some number of letters 'b' to the end of this string. Since both A and B like the characters 'a' and 'b', they have made sure that at this point, at least one 'a' and one 'b' exist in the string.
B now gives this string to C and he appends some number of letters 'c' to the end of the string. However, since C is a good friend of A and B, the number of letters 'c' he appends is equal to the number of 'a' or to the number of 'b' in the string. It is also possible that the number of letters 'c' equals both to the number of letters 'a' and to the number of letters 'b' at the same time.
You have a string in your hands, and you want to check if it is possible to obtain the string in this way or not. If it is possible to obtain the string, print "YES", otherwise print "NO" (without the quotes).
Input
The first and only line consists of a string S ( 1 ≤ |S| ≤ 5 000 ). It is guaranteed that the string will only consist of the lowercase English letters 'a', 'b', 'c'.
Output
Print "YES" or "NO", according to the condition.
Examples
Input
aaabccc
Output
YES
Input
bbacc
Output
NO
Input
aabc
Output
YES
Note
Consider first example: the number of 'c' is equal to the number of 'a'.
Consider second example: although the number of 'c' is equal to the number of the 'b', the order is not correct.
Consider third example: the number of 'c' is equal to the number of 'b'.
Tags: implementation
Correct Solution:
```
import sys
import os
import math
import re
s = input()
#first b, last a
#first c, last b
#last a,
As = [ i for i, ltr in enumerate(s) if ltr == 'a']
Bs = [i for i, ltr in enumerate(s) if ltr == 'b']
Cs = [i for i, ltr in enumerate(s) if ltr == 'c']
if (len(s) < 3 or len(Bs) == 0 or len(As) == 0 or len(Cs) == 0):
print('NO')
exit(0)
if Bs[0] < As[len(As)-1] or Cs[0] < Bs[len(Bs)-1] or Cs[0] < As[len(As) -1]:
print('NO')
exit(0)
#if count of cs is same as count of as or bs then yes
if len(Cs) == len(As) or len(Cs) == len(Bs):
print('YES')
exit(0)
print('NO')
```
| 56,911
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
A has a string consisting of some number of lowercase English letters 'a'. He gives it to his friend B who appends some number of letters 'b' to the end of this string. Since both A and B like the characters 'a' and 'b', they have made sure that at this point, at least one 'a' and one 'b' exist in the string.
B now gives this string to C and he appends some number of letters 'c' to the end of the string. However, since C is a good friend of A and B, the number of letters 'c' he appends is equal to the number of 'a' or to the number of 'b' in the string. It is also possible that the number of letters 'c' equals both to the number of letters 'a' and to the number of letters 'b' at the same time.
You have a string in your hands, and you want to check if it is possible to obtain the string in this way or not. If it is possible to obtain the string, print "YES", otherwise print "NO" (without the quotes).
Input
The first and only line consists of a string S ( 1 ≤ |S| ≤ 5 000 ). It is guaranteed that the string will only consist of the lowercase English letters 'a', 'b', 'c'.
Output
Print "YES" or "NO", according to the condition.
Examples
Input
aaabccc
Output
YES
Input
bbacc
Output
NO
Input
aabc
Output
YES
Note
Consider first example: the number of 'c' is equal to the number of 'a'.
Consider second example: although the number of 'c' is equal to the number of the 'b', the order is not correct.
Consider third example: the number of 'c' is equal to the number of 'b'.
Tags: implementation
Correct Solution:
```
S = input()
A, B, C = [], [], []
for i, v in enumerate(S):
if v == 'a':
A += [i]
if v == 'b':
B += [i]
if v == 'c':
C += [i]
if A != [] and B != [] and C != [] and A[-1] < B[0] and B[-1] < C[0] and (len(C) == len(A) or len(C) == len(B)):
print("YES")
else:
print("NO")
```
| 56,912
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
A has a string consisting of some number of lowercase English letters 'a'. He gives it to his friend B who appends some number of letters 'b' to the end of this string. Since both A and B like the characters 'a' and 'b', they have made sure that at this point, at least one 'a' and one 'b' exist in the string.
B now gives this string to C and he appends some number of letters 'c' to the end of the string. However, since C is a good friend of A and B, the number of letters 'c' he appends is equal to the number of 'a' or to the number of 'b' in the string. It is also possible that the number of letters 'c' equals both to the number of letters 'a' and to the number of letters 'b' at the same time.
You have a string in your hands, and you want to check if it is possible to obtain the string in this way or not. If it is possible to obtain the string, print "YES", otherwise print "NO" (without the quotes).
Input
The first and only line consists of a string S ( 1 ≤ |S| ≤ 5 000 ). It is guaranteed that the string will only consist of the lowercase English letters 'a', 'b', 'c'.
Output
Print "YES" or "NO", according to the condition.
Examples
Input
aaabccc
Output
YES
Input
bbacc
Output
NO
Input
aabc
Output
YES
Note
Consider first example: the number of 'c' is equal to the number of 'a'.
Consider second example: although the number of 'c' is equal to the number of the 'b', the order is not correct.
Consider third example: the number of 'c' is equal to the number of 'b'.
Tags: implementation
Correct Solution:
```
import sys
s = input()
a = 0
b = 0
c = 0
state = 'a'
for i in s:
if state == 'a':
if i == 'a':
a += 1
elif i == 'b':
b += 1
state = 'b'
elif i == 'c':
state = 'c'
c += 1
else:
print("NO")
sys.exit()
elif state == 'b':
if i == 'a':
print("NO")
sys.exit()
elif i == 'b':
b += 1
elif i == 'c':
state = 'c'
c += 1
else:
print("NO")
sys.exit()
elif state == 'c':
if i == 'a':
print("NO")
sys.exit()
elif i == 'b':
print("NO")
sys.exit()
elif i == 'c':
state = 'c'
c += 1
else:
print("NO")
sys.exit()
if a == 0 or b == 0 or (c != a and c != b):
print("NO")
else:
print("YES")
```
| 56,913
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
A has a string consisting of some number of lowercase English letters 'a'. He gives it to his friend B who appends some number of letters 'b' to the end of this string. Since both A and B like the characters 'a' and 'b', they have made sure that at this point, at least one 'a' and one 'b' exist in the string.
B now gives this string to C and he appends some number of letters 'c' to the end of the string. However, since C is a good friend of A and B, the number of letters 'c' he appends is equal to the number of 'a' or to the number of 'b' in the string. It is also possible that the number of letters 'c' equals both to the number of letters 'a' and to the number of letters 'b' at the same time.
You have a string in your hands, and you want to check if it is possible to obtain the string in this way or not. If it is possible to obtain the string, print "YES", otherwise print "NO" (without the quotes).
Input
The first and only line consists of a string S ( 1 ≤ |S| ≤ 5 000 ). It is guaranteed that the string will only consist of the lowercase English letters 'a', 'b', 'c'.
Output
Print "YES" or "NO", according to the condition.
Examples
Input
aaabccc
Output
YES
Input
bbacc
Output
NO
Input
aabc
Output
YES
Note
Consider first example: the number of 'c' is equal to the number of 'a'.
Consider second example: although the number of 'c' is equal to the number of the 'b', the order is not correct.
Consider third example: the number of 'c' is equal to the number of 'b'.
Tags: implementation
Correct Solution:
```
I = lambda:int(input())
ID = lambda:map(int, input().split())
IL = lambda:list(ID())
s = input()
a = s.count('a')
b = s.count('b')
c = s.count('c')
n = len(s)
aa = s[:a]
ba = s[a:a+b]
ca = s[a+b:]
if (c ==a or c == b) and list(set(aa))==['a'] and list(set(ba))== ['b']:
print('YES')
else:
print('NO')
```
| 56,914
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
A has a string consisting of some number of lowercase English letters 'a'. He gives it to his friend B who appends some number of letters 'b' to the end of this string. Since both A and B like the characters 'a' and 'b', they have made sure that at this point, at least one 'a' and one 'b' exist in the string.
B now gives this string to C and he appends some number of letters 'c' to the end of the string. However, since C is a good friend of A and B, the number of letters 'c' he appends is equal to the number of 'a' or to the number of 'b' in the string. It is also possible that the number of letters 'c' equals both to the number of letters 'a' and to the number of letters 'b' at the same time.
You have a string in your hands, and you want to check if it is possible to obtain the string in this way or not. If it is possible to obtain the string, print "YES", otherwise print "NO" (without the quotes).
Input
The first and only line consists of a string S ( 1 ≤ |S| ≤ 5 000 ). It is guaranteed that the string will only consist of the lowercase English letters 'a', 'b', 'c'.
Output
Print "YES" or "NO", according to the condition.
Examples
Input
aaabccc
Output
YES
Input
bbacc
Output
NO
Input
aabc
Output
YES
Note
Consider first example: the number of 'c' is equal to the number of 'a'.
Consider second example: although the number of 'c' is equal to the number of the 'b', the order is not correct.
Consider third example: the number of 'c' is equal to the number of 'b'.
Tags: implementation
Correct Solution:
```
s = input()
a = [0] * 3
k = 0
ok = True
for i in s:
c = ord(i) - ord('a')
if c == k:
a[k] += 1
elif c == k + 1:
k += 1
a[k] += 1
else:
ok = False
break
if a[0] == 0 or a[1] == 0 or (a[0] != a[2] and a[1] != a[2]):
ok = False
if ok: print('YES')
else: print('NO')
```
| 56,915
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
<image>
Input
The first line of the input is a string (between 1 and 50 characters long, inclusive). Each character will be a letter of English alphabet, lowercase or uppercase.
The second line of the input is an integer between 0 and 26, inclusive.
Output
Output the required string.
Examples
Input
AprilFool
14
Output
AprILFooL
Tags: *special, implementation
Correct Solution:
```
_27 = input()
_16 = int(input())
_27 = _27.lower()
_4 = ""
for _26 in range(len(_27)):
_19 = _27[_26]
if ord(_19) < _16 + 97:
_4 = _4 + _19.upper()
else:
_4 = _4 + _19.lower()
print(_4)
```
| 57,412
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
<image>
Input
The first line of the input is a string (between 1 and 50 characters long, inclusive). Each character will be a letter of English alphabet, lowercase or uppercase.
The second line of the input is an integer between 0 and 26, inclusive.
Output
Output the required string.
Examples
Input
AprilFool
14
Output
AprILFooL
Tags: *special, implementation
Correct Solution:
```
a = list(input().lower())
b = int(input())
for i in range(len(a)):
if ord(a[i]) - ord('a') < b:
a[i] = a[i].upper()
print(''.join(a))
```
| 57,413
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
<image>
Input
The first line of the input is a string (between 1 and 50 characters long, inclusive). Each character will be a letter of English alphabet, lowercase or uppercase.
The second line of the input is an integer between 0 and 26, inclusive.
Output
Output the required string.
Examples
Input
AprilFool
14
Output
AprILFooL
Tags: *special, implementation
Correct Solution:
```
text = input().lower()
caps = int(input())+97
for letter in text:
print(letter.upper(), end='')if letter < chr(caps) else print(letter, end='')
print()
```
| 57,414
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
<image>
Input
The first line of the input is a string (between 1 and 50 characters long, inclusive). Each character will be a letter of English alphabet, lowercase or uppercase.
The second line of the input is an integer between 0 and 26, inclusive.
Output
Output the required string.
Examples
Input
AprilFool
14
Output
AprILFooL
Tags: *special, implementation
Correct Solution:
```
s = input()
n = int(input())
d = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
e = 'abcdefghijklmnopqrstuvwxyz'
for i in s:
z = ord(i) - ord('a') if ord('a') <= ord(i) and ord(i) <= ord('z') else ord(i) - ord('A')
if z < n:
print(d[z], end = '')
else:
print(e[z], end = '')
```
| 57,415
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Let’s define a grid to be a set of tiles with 2 rows and 13 columns. Each tile has an English letter written in it. The letters don't have to be unique: there might be two or more tiles with the same letter written on them. Here is an example of a grid:
ABCDEFGHIJKLM
NOPQRSTUVWXYZ
We say that two tiles are adjacent if they share a side or a corner. In the example grid above, the tile with the letter 'A' is adjacent only to the tiles with letters 'B', 'N', and 'O'. A tile is not adjacent to itself.
A sequence of tiles is called a path if each tile in the sequence is adjacent to the tile which follows it (except for the last tile in the sequence, which of course has no successor). In this example, "ABC" is a path, and so is "KXWIHIJK". "MAB" is not a path because 'M' is not adjacent to 'A'. A single tile can be used more than once by a path (though the tile cannot occupy two consecutive places in the path because no tile is adjacent to itself).
You’re given a string s which consists of 27 upper-case English letters. Each English letter occurs at least once in s. Find a grid that contains a path whose tiles, viewed in the order that the path visits them, form the string s. If there’s no solution, print "Impossible" (without the quotes).
Input
The only line of the input contains the string s, consisting of 27 upper-case English letters. Each English letter occurs at least once in s.
Output
Output two lines, each consisting of 13 upper-case English characters, representing the rows of the grid. If there are multiple solutions, print any of them. If there is no solution print "Impossible".
Examples
Input
ABCDEFGHIJKLMNOPQRSGTUVWXYZ
Output
YXWVUTGHIJKLM
ZABCDEFSRQPON
Input
BUVTYZFQSNRIWOXXGJLKACPEMDH
Output
Impossible
Tags: brute force, constructive algorithms, implementation, strings
Correct Solution:
```
l, d = [], {}
for i, c in enumerate(input()):
if c in d:
u, v = (d[c] + i + 1) // 2, i
else:
l.append(c)
d[c] = i
s = ''.join(l * 2)
print(s[u:u + 13] + '\n' + s[u + 25:u + 12:-1] if u < v else "Impossible")
```
| 58,517
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Let’s define a grid to be a set of tiles with 2 rows and 13 columns. Each tile has an English letter written in it. The letters don't have to be unique: there might be two or more tiles with the same letter written on them. Here is an example of a grid:
ABCDEFGHIJKLM
NOPQRSTUVWXYZ
We say that two tiles are adjacent if they share a side or a corner. In the example grid above, the tile with the letter 'A' is adjacent only to the tiles with letters 'B', 'N', and 'O'. A tile is not adjacent to itself.
A sequence of tiles is called a path if each tile in the sequence is adjacent to the tile which follows it (except for the last tile in the sequence, which of course has no successor). In this example, "ABC" is a path, and so is "KXWIHIJK". "MAB" is not a path because 'M' is not adjacent to 'A'. A single tile can be used more than once by a path (though the tile cannot occupy two consecutive places in the path because no tile is adjacent to itself).
You’re given a string s which consists of 27 upper-case English letters. Each English letter occurs at least once in s. Find a grid that contains a path whose tiles, viewed in the order that the path visits them, form the string s. If there’s no solution, print "Impossible" (without the quotes).
Input
The only line of the input contains the string s, consisting of 27 upper-case English letters. Each English letter occurs at least once in s.
Output
Output two lines, each consisting of 13 upper-case English characters, representing the rows of the grid. If there are multiple solutions, print any of them. If there is no solution print "Impossible".
Examples
Input
ABCDEFGHIJKLMNOPQRSGTUVWXYZ
Output
YXWVUTGHIJKLM
ZABCDEFSRQPON
Input
BUVTYZFQSNRIWOXXGJLKACPEMDH
Output
Impossible
Tags: brute force, constructive algorithms, implementation, strings
Correct Solution:
```
s = input()
arr = [0] * 26
for i in s:
arr[ord(i) - 65] += 1
l = chr(arr.index(2) + 65)
a = s.find(l)
b = s.rfind(l)
ans = b - a - 1
x = 27 + a + ans // 2
if ans == 0:
print('Impossible')
else:
s = 3 * s
print(s[x - 12:x + 1])
s1 = s[x + 1:x + 15][::-1]
s1 = s1[:s1.find(l)] + s1[s1.find(l) + 1:]
print(s1)
```
| 58,518
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Let’s define a grid to be a set of tiles with 2 rows and 13 columns. Each tile has an English letter written in it. The letters don't have to be unique: there might be two or more tiles with the same letter written on them. Here is an example of a grid:
ABCDEFGHIJKLM
NOPQRSTUVWXYZ
We say that two tiles are adjacent if they share a side or a corner. In the example grid above, the tile with the letter 'A' is adjacent only to the tiles with letters 'B', 'N', and 'O'. A tile is not adjacent to itself.
A sequence of tiles is called a path if each tile in the sequence is adjacent to the tile which follows it (except for the last tile in the sequence, which of course has no successor). In this example, "ABC" is a path, and so is "KXWIHIJK". "MAB" is not a path because 'M' is not adjacent to 'A'. A single tile can be used more than once by a path (though the tile cannot occupy two consecutive places in the path because no tile is adjacent to itself).
You’re given a string s which consists of 27 upper-case English letters. Each English letter occurs at least once in s. Find a grid that contains a path whose tiles, viewed in the order that the path visits them, form the string s. If there’s no solution, print "Impossible" (without the quotes).
Input
The only line of the input contains the string s, consisting of 27 upper-case English letters. Each English letter occurs at least once in s.
Output
Output two lines, each consisting of 13 upper-case English characters, representing the rows of the grid. If there are multiple solutions, print any of them. If there is no solution print "Impossible".
Examples
Input
ABCDEFGHIJKLMNOPQRSGTUVWXYZ
Output
YXWVUTGHIJKLM
ZABCDEFSRQPON
Input
BUVTYZFQSNRIWOXXGJLKACPEMDH
Output
Impossible
Tags: brute force, constructive algorithms, implementation, strings
Correct Solution:
```
#!/usr/bin/env python3
l, d = [], {}
for i, c in enumerate(input()):
if c in d:
d1, len = d[c], (i-d[c]-1)//2 +1
d2 = i
else:
l.append(c)
d[c] = i
s = ''.join(l*2)
if d2-d1 <= 1:
print("Impossible")
else:
print(s[d1+26-13+len:d1+26] + s[d1:d1+len] + '\n' + s[d1+len:d1+len+13][::-1])
```
| 58,519
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Let’s define a grid to be a set of tiles with 2 rows and 13 columns. Each tile has an English letter written in it. The letters don't have to be unique: there might be two or more tiles with the same letter written on them. Here is an example of a grid:
ABCDEFGHIJKLM
NOPQRSTUVWXYZ
We say that two tiles are adjacent if they share a side or a corner. In the example grid above, the tile with the letter 'A' is adjacent only to the tiles with letters 'B', 'N', and 'O'. A tile is not adjacent to itself.
A sequence of tiles is called a path if each tile in the sequence is adjacent to the tile which follows it (except for the last tile in the sequence, which of course has no successor). In this example, "ABC" is a path, and so is "KXWIHIJK". "MAB" is not a path because 'M' is not adjacent to 'A'. A single tile can be used more than once by a path (though the tile cannot occupy two consecutive places in the path because no tile is adjacent to itself).
You’re given a string s which consists of 27 upper-case English letters. Each English letter occurs at least once in s. Find a grid that contains a path whose tiles, viewed in the order that the path visits them, form the string s. If there’s no solution, print "Impossible" (without the quotes).
Input
The only line of the input contains the string s, consisting of 27 upper-case English letters. Each English letter occurs at least once in s.
Output
Output two lines, each consisting of 13 upper-case English characters, representing the rows of the grid. If there are multiple solutions, print any of them. If there is no solution print "Impossible".
Examples
Input
ABCDEFGHIJKLMNOPQRSGTUVWXYZ
Output
YXWVUTGHIJKLM
ZABCDEFSRQPON
Input
BUVTYZFQSNRIWOXXGJLKACPEMDH
Output
Impossible
Tags: brute force, constructive algorithms, implementation, strings
Correct Solution:
```
__author__ = 'Think'
word=input()
found=False
for i in range(2, 27):
if word[i] in word[:i-1]:
place2=i
place1=word[:i-1].index(word[i])
found=True
break
if not found:
print("Impossible")
else:
rows=[[""]*13, [""]*13]
start=(place1+place2+1)//2
pos=0
skip=0
while pos<26:
if (start+pos+skip)%27==place2:
skip=1
else:
point=(start+pos+skip)%27
if pos<13:
rows[0][pos]=word[point]
else:
rows[1][25-pos]=word[point]
pos+=1
for i in rows[0]:
print(i, end="")
print()
for j in rows[1]:
print(j, end="")
```
| 58,520
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Let’s define a grid to be a set of tiles with 2 rows and 13 columns. Each tile has an English letter written in it. The letters don't have to be unique: there might be two or more tiles with the same letter written on them. Here is an example of a grid:
ABCDEFGHIJKLM
NOPQRSTUVWXYZ
We say that two tiles are adjacent if they share a side or a corner. In the example grid above, the tile with the letter 'A' is adjacent only to the tiles with letters 'B', 'N', and 'O'. A tile is not adjacent to itself.
A sequence of tiles is called a path if each tile in the sequence is adjacent to the tile which follows it (except for the last tile in the sequence, which of course has no successor). In this example, "ABC" is a path, and so is "KXWIHIJK". "MAB" is not a path because 'M' is not adjacent to 'A'. A single tile can be used more than once by a path (though the tile cannot occupy two consecutive places in the path because no tile is adjacent to itself).
You’re given a string s which consists of 27 upper-case English letters. Each English letter occurs at least once in s. Find a grid that contains a path whose tiles, viewed in the order that the path visits them, form the string s. If there’s no solution, print "Impossible" (without the quotes).
Input
The only line of the input contains the string s, consisting of 27 upper-case English letters. Each English letter occurs at least once in s.
Output
Output two lines, each consisting of 13 upper-case English characters, representing the rows of the grid. If there are multiple solutions, print any of them. If there is no solution print "Impossible".
Examples
Input
ABCDEFGHIJKLMNOPQRSGTUVWXYZ
Output
YXWVUTGHIJKLM
ZABCDEFSRQPON
Input
BUVTYZFQSNRIWOXXGJLKACPEMDH
Output
Impossible
Tags: brute force, constructive algorithms, implementation, strings
Correct Solution:
```
s = input()
from collections import Counter
cnt = Counter(s)
sc = sorted(cnt.items(), key=(lambda x: x[1]), reverse=True)[0][0]
s = s[s.index(sc):] + s[:s.index(sc)]
if s[0] == s[1]:
print('Impossible')
exit(0)
sl, sr = s[:1+s[1:].index(sc)], s[s[1:].index(sc)+2:]
slu = sl[:(len(sl)+1)//2][::-1]
sru = sr[:13-len(slu)]
sld = sl[len(slu):]
srd = sr[len(sru):][::-1]
print(slu+sru)
print(sld+srd)
```
| 58,521
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Let’s define a grid to be a set of tiles with 2 rows and 13 columns. Each tile has an English letter written in it. The letters don't have to be unique: there might be two or more tiles with the same letter written on them. Here is an example of a grid:
ABCDEFGHIJKLM
NOPQRSTUVWXYZ
We say that two tiles are adjacent if they share a side or a corner. In the example grid above, the tile with the letter 'A' is adjacent only to the tiles with letters 'B', 'N', and 'O'. A tile is not adjacent to itself.
A sequence of tiles is called a path if each tile in the sequence is adjacent to the tile which follows it (except for the last tile in the sequence, which of course has no successor). In this example, "ABC" is a path, and so is "KXWIHIJK". "MAB" is not a path because 'M' is not adjacent to 'A'. A single tile can be used more than once by a path (though the tile cannot occupy two consecutive places in the path because no tile is adjacent to itself).
You’re given a string s which consists of 27 upper-case English letters. Each English letter occurs at least once in s. Find a grid that contains a path whose tiles, viewed in the order that the path visits them, form the string s. If there’s no solution, print "Impossible" (without the quotes).
Input
The only line of the input contains the string s, consisting of 27 upper-case English letters. Each English letter occurs at least once in s.
Output
Output two lines, each consisting of 13 upper-case English characters, representing the rows of the grid. If there are multiple solutions, print any of them. If there is no solution print "Impossible".
Examples
Input
ABCDEFGHIJKLMNOPQRSGTUVWXYZ
Output
YXWVUTGHIJKLM
ZABCDEFSRQPON
Input
BUVTYZFQSNRIWOXXGJLKACPEMDH
Output
Impossible
Tags: brute force, constructive algorithms, implementation, strings
Correct Solution:
```
d = {} # chars to ints
di = {} # ints to chars
ct = 0
x = input()
bad = []
for i in x:
if (i not in d):
ct+=1
d[i] = ct
di[ct] = i
else:
bad = [ct, d[i]]
if (bad[0] == bad[1]):
print("Impossible")
quit()
def gen(x):
bot = []
for i in range(x+13, x, -1):
bot.append(i)
top = []
for i in range(x+14, 27): top.append(i)
for i in range(1, x+1): top.append(i)
return [top, bot]
def gen2(x):
top = []
bot = []
for i in range(x-1):
top.append(2*i+1)
bot.append(2*i+2)
for i in range(2*x-1, x+13):
top.append(i)
bot.append(2*x+25-i)
return [top, bot]
for i in range(1, 14):
if (bad[0]+bad[1] == 2*i or bad[0]+bad[1] == 2*i+1):
a, b = gen(i)
for j in a:
print(di[j], end = '')
print()
for j in b:
print(di[j], end = '')
for i in range(2, 15):
if bad[0]+bad[1] in [2*i+24, 2*i+25]:
a, b = gen2(i)
for j in a:
print(di[j], end = '')
print()
for j in b:
print(di[j], end = '')
```
| 58,522
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Let’s define a grid to be a set of tiles with 2 rows and 13 columns. Each tile has an English letter written in it. The letters don't have to be unique: there might be two or more tiles with the same letter written on them. Here is an example of a grid:
ABCDEFGHIJKLM
NOPQRSTUVWXYZ
We say that two tiles are adjacent if they share a side or a corner. In the example grid above, the tile with the letter 'A' is adjacent only to the tiles with letters 'B', 'N', and 'O'. A tile is not adjacent to itself.
A sequence of tiles is called a path if each tile in the sequence is adjacent to the tile which follows it (except for the last tile in the sequence, which of course has no successor). In this example, "ABC" is a path, and so is "KXWIHIJK". "MAB" is not a path because 'M' is not adjacent to 'A'. A single tile can be used more than once by a path (though the tile cannot occupy two consecutive places in the path because no tile is adjacent to itself).
You’re given a string s which consists of 27 upper-case English letters. Each English letter occurs at least once in s. Find a grid that contains a path whose tiles, viewed in the order that the path visits them, form the string s. If there’s no solution, print "Impossible" (without the quotes).
Input
The only line of the input contains the string s, consisting of 27 upper-case English letters. Each English letter occurs at least once in s.
Output
Output two lines, each consisting of 13 upper-case English characters, representing the rows of the grid. If there are multiple solutions, print any of them. If there is no solution print "Impossible".
Examples
Input
ABCDEFGHIJKLMNOPQRSGTUVWXYZ
Output
YXWVUTGHIJKLM
ZABCDEFSRQPON
Input
BUVTYZFQSNRIWOXXGJLKACPEMDH
Output
Impossible
Tags: brute force, constructive algorithms, implementation, strings
Correct Solution:
```
s = input()
l, r = -1, -1
for c in 'QWERTYUIOPLKJHGFDSAZXCVBNM':
if s.count(c) == 2:
l, r = s.find(c), s.rfind(c)
break
if r - l < 2:
print('Impossible')
else:
res = [['_'] * 13 for x in range(2)]
i, j = 0, -1 - (r - l - 1) // 2
s = s[l:r] + s[r + 1:] + s[:l]
for c in s:
res[i][j] = c
if (i == 0 and j == -1) or (i == 1 and j == -13):
i ^= 1
else:
j += 1 if i == 0 else -1
for line in res:
print(*line, sep='')
```
| 58,523
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Let’s define a grid to be a set of tiles with 2 rows and 13 columns. Each tile has an English letter written in it. The letters don't have to be unique: there might be two or more tiles with the same letter written on them. Here is an example of a grid:
ABCDEFGHIJKLM
NOPQRSTUVWXYZ
We say that two tiles are adjacent if they share a side or a corner. In the example grid above, the tile with the letter 'A' is adjacent only to the tiles with letters 'B', 'N', and 'O'. A tile is not adjacent to itself.
A sequence of tiles is called a path if each tile in the sequence is adjacent to the tile which follows it (except for the last tile in the sequence, which of course has no successor). In this example, "ABC" is a path, and so is "KXWIHIJK". "MAB" is not a path because 'M' is not adjacent to 'A'. A single tile can be used more than once by a path (though the tile cannot occupy two consecutive places in the path because no tile is adjacent to itself).
You’re given a string s which consists of 27 upper-case English letters. Each English letter occurs at least once in s. Find a grid that contains a path whose tiles, viewed in the order that the path visits them, form the string s. If there’s no solution, print "Impossible" (without the quotes).
Input
The only line of the input contains the string s, consisting of 27 upper-case English letters. Each English letter occurs at least once in s.
Output
Output two lines, each consisting of 13 upper-case English characters, representing the rows of the grid. If there are multiple solutions, print any of them. If there is no solution print "Impossible".
Examples
Input
ABCDEFGHIJKLMNOPQRSGTUVWXYZ
Output
YXWVUTGHIJKLM
ZABCDEFSRQPON
Input
BUVTYZFQSNRIWOXXGJLKACPEMDH
Output
Impossible
Tags: brute force, constructive algorithms, implementation, strings
Correct Solution:
```
s1=["" for j in range(13)]
s2=["" for j in range(13)]
s=input()
f=0
for i in range(27):
if f==0 and s.count(s[i])==2:
f=1
sp1=i
elif f==1 and s[i]==s[sp1]:
sp2=i
break
if sp2-sp1==1:
print("Impossible")
else:
tp=12-(sp2-sp1-1)//2
for i in range(27):
if i<=sp1:
if sp1-i<=tp:
s1[tp-sp1+i]=s[i]
elif sp1-i-tp-1<=12:
s2[sp1-i-tp-1]=s[i]
else:
s1[25-(sp1-i-tp-1)]=s[i]
else:
if i==sp2:
continue
elif i<sp2:
j=i
else:
j=i-1
if tp+(j-sp1)<=12:
s1[tp+(j-sp1)]=s[i]
elif 25-(tp+(j-sp1))<=12 and 25-(tp+(j-sp1))>=0:
s2[25-(tp+(j-sp1))]=s[i]
else:
s1[abs(26-(tp+(j-sp1)))]=s[i]
print("".join(s1))
print("".join(s2))
```
| 58,524
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Oleg the client and Igor the analyst are good friends. However, sometimes they argue over little things. Recently, they started a new company, but they are having trouble finding a name for the company.
To settle this problem, they've decided to play a game. The company name will consist of n letters. Oleg and Igor each have a set of n letters (which might contain multiple copies of the same letter, the sets can be different). Initially, the company name is denoted by n question marks. Oleg and Igor takes turns to play the game, Oleg moves first. In each turn, a player can choose one of the letters c in his set and replace any of the question marks with c. Then, a copy of the letter c is removed from his set. The game ends when all the question marks has been replaced by some letter.
For example, suppose Oleg has the set of letters {i, o, i} and Igor has the set of letters {i, m, o}. One possible game is as follows :
Initially, the company name is ???.
Oleg replaces the second question mark with 'i'. The company name becomes ?i?. The set of letters Oleg have now is {i, o}.
Igor replaces the third question mark with 'o'. The company name becomes ?io. The set of letters Igor have now is {i, m}.
Finally, Oleg replaces the first question mark with 'o'. The company name becomes oio. The set of letters Oleg have now is {i}.
In the end, the company name is oio.
Oleg wants the company name to be as lexicographically small as possible while Igor wants the company name to be as lexicographically large as possible. What will be the company name if Oleg and Igor always play optimally?
A string s = s1s2...sm is called lexicographically smaller than a string t = t1t2...tm (where s ≠ t) if si < ti where i is the smallest index such that si ≠ ti. (so sj = tj for all j < i)
Input
The first line of input contains a string s of length n (1 ≤ n ≤ 3·105). All characters of the string are lowercase English letters. This string denotes the set of letters Oleg has initially.
The second line of input contains a string t of length n. All characters of the string are lowercase English letters. This string denotes the set of letters Igor has initially.
Output
The output should contain a string of n lowercase English letters, denoting the company name if Oleg and Igor plays optimally.
Examples
Input
tinkoff
zscoder
Output
fzfsirk
Input
xxxxxx
xxxxxx
Output
xxxxxx
Input
ioi
imo
Output
ioi
Note
One way to play optimally in the first sample is as follows :
* Initially, the company name is ???????.
* Oleg replaces the first question mark with 'f'. The company name becomes f??????.
* Igor replaces the second question mark with 'z'. The company name becomes fz?????.
* Oleg replaces the third question mark with 'f'. The company name becomes fzf????.
* Igor replaces the fourth question mark with 's'. The company name becomes fzfs???.
* Oleg replaces the fifth question mark with 'i'. The company name becomes fzfsi??.
* Igor replaces the sixth question mark with 'r'. The company name becomes fzfsir?.
* Oleg replaces the seventh question mark with 'k'. The company name becomes fzfsirk.
For the second sample, no matter how they play, the company name will always be xxxxxx.
Tags: games, greedy, sortings
Correct Solution:
```
s = list(map(str,input()))
c = list(map(str,input()))
n = len(s)
s.sort()
c.sort(reverse = True)
s = s[:(n+1)//2]
c = c[:n//2]
l_s = len(s)
l_c = len(c)
begin_s = 0
begin_c = 0
end_s = l_s-1
end_c = l_c-1
ans1 = []
ans2 = []
for i in range(n-1):
if i%2 == 0:
if s[begin_s] >= c[begin_c]:
ans2.append(s[end_s])
end_s -= 1
else:
ans1.append(s[begin_s])
begin_s += 1
else:
if c[begin_c] <= s[begin_s]:
ans2.append(c[end_c])
end_c -= 1
else:
ans1.append(c[begin_c])
begin_c += 1
if n%2:
ans1.append(s[begin_s])
else:
ans1.append(c[begin_c])
print(*ans1+list(reversed(ans2)),sep='')
```
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Oleg the client and Igor the analyst are good friends. However, sometimes they argue over little things. Recently, they started a new company, but they are having trouble finding a name for the company.
To settle this problem, they've decided to play a game. The company name will consist of n letters. Oleg and Igor each have a set of n letters (which might contain multiple copies of the same letter, the sets can be different). Initially, the company name is denoted by n question marks. Oleg and Igor takes turns to play the game, Oleg moves first. In each turn, a player can choose one of the letters c in his set and replace any of the question marks with c. Then, a copy of the letter c is removed from his set. The game ends when all the question marks has been replaced by some letter.
For example, suppose Oleg has the set of letters {i, o, i} and Igor has the set of letters {i, m, o}. One possible game is as follows :
Initially, the company name is ???.
Oleg replaces the second question mark with 'i'. The company name becomes ?i?. The set of letters Oleg have now is {i, o}.
Igor replaces the third question mark with 'o'. The company name becomes ?io. The set of letters Igor have now is {i, m}.
Finally, Oleg replaces the first question mark with 'o'. The company name becomes oio. The set of letters Oleg have now is {i}.
In the end, the company name is oio.
Oleg wants the company name to be as lexicographically small as possible while Igor wants the company name to be as lexicographically large as possible. What will be the company name if Oleg and Igor always play optimally?
A string s = s1s2...sm is called lexicographically smaller than a string t = t1t2...tm (where s ≠ t) if si < ti where i is the smallest index such that si ≠ ti. (so sj = tj for all j < i)
Input
The first line of input contains a string s of length n (1 ≤ n ≤ 3·105). All characters of the string are lowercase English letters. This string denotes the set of letters Oleg has initially.
The second line of input contains a string t of length n. All characters of the string are lowercase English letters. This string denotes the set of letters Igor has initially.
Output
The output should contain a string of n lowercase English letters, denoting the company name if Oleg and Igor plays optimally.
Examples
Input
tinkoff
zscoder
Output
fzfsirk
Input
xxxxxx
xxxxxx
Output
xxxxxx
Input
ioi
imo
Output
ioi
Note
One way to play optimally in the first sample is as follows :
* Initially, the company name is ???????.
* Oleg replaces the first question mark with 'f'. The company name becomes f??????.
* Igor replaces the second question mark with 'z'. The company name becomes fz?????.
* Oleg replaces the third question mark with 'f'. The company name becomes fzf????.
* Igor replaces the fourth question mark with 's'. The company name becomes fzfs???.
* Oleg replaces the fifth question mark with 'i'. The company name becomes fzfsi??.
* Igor replaces the sixth question mark with 'r'. The company name becomes fzfsir?.
* Oleg replaces the seventh question mark with 'k'. The company name becomes fzfsirk.
For the second sample, no matter how they play, the company name will always be xxxxxx.
Tags: games, greedy, sortings
Correct Solution:
```
import sys
def main():
s=sys.stdin.readline().rstrip()
t=sys.stdin.readline().rstrip()
result=[]
iisl=0
iisr=len(s)//2+len(s)%2-1
iitl=0
iitr=len(s)//2-1
aas=list(sorted(list(s)))
aat=list(sorted(list(t),reverse=True))
rl=0
rr=len(s)-1
result=['?']*len(s)
for i in range(len(s)):
if i%2==0:
if aas[iisl]<aat[iitl]:
result[rl]=aas[iisl]
iisl+=1
rl+=1
else:
result[rr]=aas[iisr]
iisr-=1
rr-=1
else:
if aat[iitl]>aas[iisl]:
result[rl]=aat[iitl]
iitl+=1
rl+=1
else:
result[rr]=aat[iitr]
iitr-=1
rr-=1
sys.stdout.write(''.join(result)+'\n')
main()
```
| 58,554
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Oleg the client and Igor the analyst are good friends. However, sometimes they argue over little things. Recently, they started a new company, but they are having trouble finding a name for the company.
To settle this problem, they've decided to play a game. The company name will consist of n letters. Oleg and Igor each have a set of n letters (which might contain multiple copies of the same letter, the sets can be different). Initially, the company name is denoted by n question marks. Oleg and Igor takes turns to play the game, Oleg moves first. In each turn, a player can choose one of the letters c in his set and replace any of the question marks with c. Then, a copy of the letter c is removed from his set. The game ends when all the question marks has been replaced by some letter.
For example, suppose Oleg has the set of letters {i, o, i} and Igor has the set of letters {i, m, o}. One possible game is as follows :
Initially, the company name is ???.
Oleg replaces the second question mark with 'i'. The company name becomes ?i?. The set of letters Oleg have now is {i, o}.
Igor replaces the third question mark with 'o'. The company name becomes ?io. The set of letters Igor have now is {i, m}.
Finally, Oleg replaces the first question mark with 'o'. The company name becomes oio. The set of letters Oleg have now is {i}.
In the end, the company name is oio.
Oleg wants the company name to be as lexicographically small as possible while Igor wants the company name to be as lexicographically large as possible. What will be the company name if Oleg and Igor always play optimally?
A string s = s1s2...sm is called lexicographically smaller than a string t = t1t2...tm (where s ≠ t) if si < ti where i is the smallest index such that si ≠ ti. (so sj = tj for all j < i)
Input
The first line of input contains a string s of length n (1 ≤ n ≤ 3·105). All characters of the string are lowercase English letters. This string denotes the set of letters Oleg has initially.
The second line of input contains a string t of length n. All characters of the string are lowercase English letters. This string denotes the set of letters Igor has initially.
Output
The output should contain a string of n lowercase English letters, denoting the company name if Oleg and Igor plays optimally.
Examples
Input
tinkoff
zscoder
Output
fzfsirk
Input
xxxxxx
xxxxxx
Output
xxxxxx
Input
ioi
imo
Output
ioi
Note
One way to play optimally in the first sample is as follows :
* Initially, the company name is ???????.
* Oleg replaces the first question mark with 'f'. The company name becomes f??????.
* Igor replaces the second question mark with 'z'. The company name becomes fz?????.
* Oleg replaces the third question mark with 'f'. The company name becomes fzf????.
* Igor replaces the fourth question mark with 's'. The company name becomes fzfs???.
* Oleg replaces the fifth question mark with 'i'. The company name becomes fzfsi??.
* Igor replaces the sixth question mark with 'r'. The company name becomes fzfsir?.
* Oleg replaces the seventh question mark with 'k'. The company name becomes fzfsirk.
For the second sample, no matter how they play, the company name will always be xxxxxx.
Tags: games, greedy, sortings
Correct Solution:
```
# Author : raj1307 - Raj Singh
# Date : 18.03.2021
from __future__ import division, print_function
import os,sys
from io import BytesIO, IOBase
if sys.version_info[0] < 3:
from __builtin__ import xrange as range
from future_builtins import ascii, filter, hex, map, oct, zip
def ii(): return int(input())
def si(): return input()
def mi(): return map(int,input().strip().split(" "))
def msi(): return map(str,input().strip().split(" "))
def li(): return list(mi())
def dmain():
sys.setrecursionlimit(1000000)
threading.stack_size(1024000)
thread = threading.Thread(target=main)
thread.start()
#from collections import deque, Counter, OrderedDict,defaultdict
#from heapq import nsmallest, nlargest, heapify,heappop ,heappush, heapreplace
#from math import log,sqrt,factorial,cos,tan,sin,radians
#from bisect import bisect,bisect_left,bisect_right,insort,insort_left,insort_right
#from decimal import *
#import threading
#from itertools import permutations
#Copy 2D list m = [x[:] for x in mark] .. Avoid Using Deepcopy
abc='abcdefghijklmnopqrstuvwxyz'
abd={'a': 0, 'b': 1, 'c': 2, 'd': 3, 'e': 4, 'f': 5, 'g': 6, 'h': 7, 'i': 8, 'j': 9, 'k': 10, 'l': 11, 'm': 12, 'n': 13, 'o': 14, 'p': 15, 'q': 16, 'r': 17, 's': 18, 't': 19, 'u': 20, 'v': 21, 'w': 22, 'x': 23, 'y': 24, 'z': 25}
mod=1000000007
#mod=998244353
inf = float("inf")
vow=['a','e','i','o','u']
dx,dy=[-1,1,0,0],[0,0,1,-1]
def getKey(item): return item[1]
def sort2(l):return sorted(l, key=getKey,reverse=True)
def d2(n,m,num):return [[num for x in range(m)] for y in range(n)]
def isPowerOfTwo (x): return (x and (not(x & (x - 1))) )
def decimalToBinary(n): return bin(n).replace("0b","")
def ntl(n):return [int(i) for i in str(n)]
def ncr(n,r): return factorial(n)//(factorial(r)*factorial(max(n-r,1)))
def ceil(x,y):
if x%y==0:
return x//y
else:
return x//y+1
def powerMod(x,y,p):
res = 1
x %= p
while y > 0:
if y&1:
res = (res*x)%p
y = y>>1
x = (x*x)%p
return res
def gcd(x, y):
while y:
x, y = y, x % y
return x
def isPrime(n) : # Check Prime Number or not
if (n <= 1) : return False
if (n <= 3) : return True
if (n % 2 == 0 or n % 3 == 0) : return False
i = 5
while(i * i <= n) :
if (n % i == 0 or n % (i + 2) == 0) :
return False
i = i + 6
return True
def read():
sys.stdin = open('input.txt', 'r')
sys.stdout = open('output.txt', 'w')
def main():
#for _ in range(1):
s=list(si())
t=list(si())
a=['']*len(s)
n=len(s)
i1=0
i2=n//2+(n%2)-1
j1=ceil(n,2)
j2=n-1
p=0
q=n-1
s.sort()
t.sort()
turn=0
f=[0]*26
g=[0]*26
for i in range(n):
f[ord(s[i])-ord('a')]+=1
g[ord(t[i])-ord('a')]+=1
cnt=0
while cnt<n:
if turn==0:
flag=1
for k in range(26):
if g[k] and k>(ord(s[i1])-ord('a')):
flag=0
break
if flag==0:
a[p]=s[i1]
p+=1
f[ord(s[i1])-ord('a')]-=1
i1+=1
else:
a[q]=s[i2]
f[ord(s[i2])-ord('a')]-=1
i2-=1
q-=1
else:
flag=1
for k in range(26):
if f[k] and k<(ord(t[j2])-ord('a')):
flag=0
break
if flag==0:
a[p]=t[j2]
p+=1
g[ord(t[j2])-ord('a')]-=1
j2-=1
else:
a[q]=t[j1]
g[ord(t[j1])-ord('a')]-=1
j1+=1
q-=1
cnt+=1
turn^=1
for i in a:
print(i,end='')
# region fastio
# template taken from https://github.com/cheran-senthil/PyRival/blob/master/templates/template.py
BUFSIZE = 8192
class FastIO(IOBase):
newlines = 0
def __init__(self, file):
self._fd = file.fileno()
self.buffer = BytesIO()
self.writable = "x" in file.mode or "r" not in file.mode
self.write = self.buffer.write if self.writable else None
def read(self):
while True:
b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
if not b:
break
ptr = self.buffer.tell()
self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
self.newlines = 0
return self.buffer.read()
def readline(self):
while self.newlines == 0:
b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
self.newlines = b.count(b"\n") + (not b)
ptr = self.buffer.tell()
self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
self.newlines -= 1
return self.buffer.readline()
def flush(self):
if self.writable:
os.write(self._fd, self.buffer.getvalue())
self.buffer.truncate(0), self.buffer.seek(0)
class IOWrapper(IOBase):
def __init__(self, file):
self.buffer = FastIO(file)
self.flush = self.buffer.flush
self.writable = self.buffer.writable
self.write = lambda s: self.buffer.write(s.encode("ascii"))
self.read = lambda: self.buffer.read().decode("ascii")
self.readline = lambda: self.buffer.readline().decode("ascii")
def print(*args, **kwargs):
"""Prints the values to a stream, or to sys.stdout by default."""
sep, file = kwargs.pop("sep", " "), kwargs.pop("file", sys.stdout)
at_start = True
for x in args:
if not at_start:
file.write(sep)
file.write(str(x))
at_start = False
file.write(kwargs.pop("end", "\n"))
if kwargs.pop("flush", False):
file.flush()
if sys.version_info[0] < 3:
sys.stdin, sys.stdout = FastIO(sys.stdin), FastIO(sys.stdout)
else:
sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)
input = lambda: sys.stdin.readline().rstrip("\r\n")
# endregion
if __name__ == "__main__":
#read()
main()
#dmain()
# Comment Read()
```
| 58,555
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Oleg the client and Igor the analyst are good friends. However, sometimes they argue over little things. Recently, they started a new company, but they are having trouble finding a name for the company.
To settle this problem, they've decided to play a game. The company name will consist of n letters. Oleg and Igor each have a set of n letters (which might contain multiple copies of the same letter, the sets can be different). Initially, the company name is denoted by n question marks. Oleg and Igor takes turns to play the game, Oleg moves first. In each turn, a player can choose one of the letters c in his set and replace any of the question marks with c. Then, a copy of the letter c is removed from his set. The game ends when all the question marks has been replaced by some letter.
For example, suppose Oleg has the set of letters {i, o, i} and Igor has the set of letters {i, m, o}. One possible game is as follows :
Initially, the company name is ???.
Oleg replaces the second question mark with 'i'. The company name becomes ?i?. The set of letters Oleg have now is {i, o}.
Igor replaces the third question mark with 'o'. The company name becomes ?io. The set of letters Igor have now is {i, m}.
Finally, Oleg replaces the first question mark with 'o'. The company name becomes oio. The set of letters Oleg have now is {i}.
In the end, the company name is oio.
Oleg wants the company name to be as lexicographically small as possible while Igor wants the company name to be as lexicographically large as possible. What will be the company name if Oleg and Igor always play optimally?
A string s = s1s2...sm is called lexicographically smaller than a string t = t1t2...tm (where s ≠ t) if si < ti where i is the smallest index such that si ≠ ti. (so sj = tj for all j < i)
Input
The first line of input contains a string s of length n (1 ≤ n ≤ 3·105). All characters of the string are lowercase English letters. This string denotes the set of letters Oleg has initially.
The second line of input contains a string t of length n. All characters of the string are lowercase English letters. This string denotes the set of letters Igor has initially.
Output
The output should contain a string of n lowercase English letters, denoting the company name if Oleg and Igor plays optimally.
Examples
Input
tinkoff
zscoder
Output
fzfsirk
Input
xxxxxx
xxxxxx
Output
xxxxxx
Input
ioi
imo
Output
ioi
Note
One way to play optimally in the first sample is as follows :
* Initially, the company name is ???????.
* Oleg replaces the first question mark with 'f'. The company name becomes f??????.
* Igor replaces the second question mark with 'z'. The company name becomes fz?????.
* Oleg replaces the third question mark with 'f'. The company name becomes fzf????.
* Igor replaces the fourth question mark with 's'. The company name becomes fzfs???.
* Oleg replaces the fifth question mark with 'i'. The company name becomes fzfsi??.
* Igor replaces the sixth question mark with 'r'. The company name becomes fzfsir?.
* Oleg replaces the seventh question mark with 'k'. The company name becomes fzfsirk.
For the second sample, no matter how they play, the company name will always be xxxxxx.
Tags: games, greedy, sortings
Correct Solution:
```
import sys
import math
from collections import defaultdict,deque
import heapq
oleg=list(sys.stdin.readline()[:-1])
igor=list(sys.stdin.readline()[:-1])
oleg.sort()
igor.sort()
igor.reverse()
n=len(oleg)
ans=[0 for _ in range(n)]
cnto,cnti=n//2+n%2,n//2
indo,indi=0,0
ind=0
oleg=oleg[:cnto]
igor=igor[:cnti]
igor.reverse()
sto,endo=0,len(oleg)-1
sti,endi=0,len(igor)-1
turn =True
indst,indend=0,n-1
'''if n==1:
print(min(oleg))
sys.exit()
if n==2:
if min(oleg)<max(igor):
print(oleg[0]+igor[-1])
else:
print(igor[-1]+oleg[0])
sys.exit()'''
#print(sto,'sto',endo,'endo',sti,'sti',endi,'endi')
#print(oleg,'oleg')
#print(igor,'igor')
while indst<=indend and (sto<=endo) and (sti<=endi):
#print(sto,'sto',endo,'endo',sti,'sti',endi,'endi')
if turn :
if oleg[sto]<igor[endi]:
ans[indst]=oleg[sto]
sto+=1
indst+=1
else:
ans[indend]=oleg[endo]
endo-=1
indend-=1
turn =False
else:
if igor[endi]>oleg[sto]:
ans[indst]=igor[endi]
endi-=1
indst+=1
else:
ans[indend]=igor[sti]
sti+=1
indend-=1
turn =True
if sto<=endo and indst<=indend:
ans[indst]=oleg[sto]
indst+=1
if sti<=endi and indst<=indend:
ans[indst]=igor[sti]
#print(ans,'as')
#print(indst,'indst',indend,'indend')
print(''.join(x for x in ans))
```
| 58,556
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Oleg the client and Igor the analyst are good friends. However, sometimes they argue over little things. Recently, they started a new company, but they are having trouble finding a name for the company.
To settle this problem, they've decided to play a game. The company name will consist of n letters. Oleg and Igor each have a set of n letters (which might contain multiple copies of the same letter, the sets can be different). Initially, the company name is denoted by n question marks. Oleg and Igor takes turns to play the game, Oleg moves first. In each turn, a player can choose one of the letters c in his set and replace any of the question marks with c. Then, a copy of the letter c is removed from his set. The game ends when all the question marks has been replaced by some letter.
For example, suppose Oleg has the set of letters {i, o, i} and Igor has the set of letters {i, m, o}. One possible game is as follows :
Initially, the company name is ???.
Oleg replaces the second question mark with 'i'. The company name becomes ?i?. The set of letters Oleg have now is {i, o}.
Igor replaces the third question mark with 'o'. The company name becomes ?io. The set of letters Igor have now is {i, m}.
Finally, Oleg replaces the first question mark with 'o'. The company name becomes oio. The set of letters Oleg have now is {i}.
In the end, the company name is oio.
Oleg wants the company name to be as lexicographically small as possible while Igor wants the company name to be as lexicographically large as possible. What will be the company name if Oleg and Igor always play optimally?
A string s = s1s2...sm is called lexicographically smaller than a string t = t1t2...tm (where s ≠ t) if si < ti where i is the smallest index such that si ≠ ti. (so sj = tj for all j < i)
Input
The first line of input contains a string s of length n (1 ≤ n ≤ 3·105). All characters of the string are lowercase English letters. This string denotes the set of letters Oleg has initially.
The second line of input contains a string t of length n. All characters of the string are lowercase English letters. This string denotes the set of letters Igor has initially.
Output
The output should contain a string of n lowercase English letters, denoting the company name if Oleg and Igor plays optimally.
Examples
Input
tinkoff
zscoder
Output
fzfsirk
Input
xxxxxx
xxxxxx
Output
xxxxxx
Input
ioi
imo
Output
ioi
Note
One way to play optimally in the first sample is as follows :
* Initially, the company name is ???????.
* Oleg replaces the first question mark with 'f'. The company name becomes f??????.
* Igor replaces the second question mark with 'z'. The company name becomes fz?????.
* Oleg replaces the third question mark with 'f'. The company name becomes fzf????.
* Igor replaces the fourth question mark with 's'. The company name becomes fzfs???.
* Oleg replaces the fifth question mark with 'i'. The company name becomes fzfsi??.
* Igor replaces the sixth question mark with 'r'. The company name becomes fzfsir?.
* Oleg replaces the seventh question mark with 'k'. The company name becomes fzfsirk.
For the second sample, no matter how they play, the company name will always be xxxxxx.
Tags: games, greedy, sortings
Correct Solution:
```
a = sorted(input())
b = sorted(input(), reverse=True)
n = len(a)
a = ''.join(a[:(n+1)//2])
b = ''.join(b[:n//2])
name = ['']*(len(a)+len(b))
ia = ib = ic = 0
ja = len(a)-1
jb = len(b)-1
jc = len(name)-1
turn = 1
while ic <= jc:
if turn == 1:
if ib > jb: name[ic] = a[ia]; ic+= 1
elif a[ia] < b[ib]: name[ic] = a[ia]; ia+= 1; ic+= 1
else: name[jc] = a[ja]; ja-= 1; jc-= 1
else:
if ia > ja: name[ic] = b[ib]; ic+= 1
elif b[ib] > a[ia]: name[ic] = b[ib]; ib+= 1; ic+= 1
else: name[jc] = b[jb]; jb-= 1; jc-= 1
turn = 3-turn
print(''.join(name))
```
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Oleg the client and Igor the analyst are good friends. However, sometimes they argue over little things. Recently, they started a new company, but they are having trouble finding a name for the company.
To settle this problem, they've decided to play a game. The company name will consist of n letters. Oleg and Igor each have a set of n letters (which might contain multiple copies of the same letter, the sets can be different). Initially, the company name is denoted by n question marks. Oleg and Igor takes turns to play the game, Oleg moves first. In each turn, a player can choose one of the letters c in his set and replace any of the question marks with c. Then, a copy of the letter c is removed from his set. The game ends when all the question marks has been replaced by some letter.
For example, suppose Oleg has the set of letters {i, o, i} and Igor has the set of letters {i, m, o}. One possible game is as follows :
Initially, the company name is ???.
Oleg replaces the second question mark with 'i'. The company name becomes ?i?. The set of letters Oleg have now is {i, o}.
Igor replaces the third question mark with 'o'. The company name becomes ?io. The set of letters Igor have now is {i, m}.
Finally, Oleg replaces the first question mark with 'o'. The company name becomes oio. The set of letters Oleg have now is {i}.
In the end, the company name is oio.
Oleg wants the company name to be as lexicographically small as possible while Igor wants the company name to be as lexicographically large as possible. What will be the company name if Oleg and Igor always play optimally?
A string s = s1s2...sm is called lexicographically smaller than a string t = t1t2...tm (where s ≠ t) if si < ti where i is the smallest index such that si ≠ ti. (so sj = tj for all j < i)
Input
The first line of input contains a string s of length n (1 ≤ n ≤ 3·105). All characters of the string are lowercase English letters. This string denotes the set of letters Oleg has initially.
The second line of input contains a string t of length n. All characters of the string are lowercase English letters. This string denotes the set of letters Igor has initially.
Output
The output should contain a string of n lowercase English letters, denoting the company name if Oleg and Igor plays optimally.
Examples
Input
tinkoff
zscoder
Output
fzfsirk
Input
xxxxxx
xxxxxx
Output
xxxxxx
Input
ioi
imo
Output
ioi
Note
One way to play optimally in the first sample is as follows :
* Initially, the company name is ???????.
* Oleg replaces the first question mark with 'f'. The company name becomes f??????.
* Igor replaces the second question mark with 'z'. The company name becomes fz?????.
* Oleg replaces the third question mark with 'f'. The company name becomes fzf????.
* Igor replaces the fourth question mark with 's'. The company name becomes fzfs???.
* Oleg replaces the fifth question mark with 'i'. The company name becomes fzfsi??.
* Igor replaces the sixth question mark with 'r'. The company name becomes fzfsir?.
* Oleg replaces the seventh question mark with 'k'. The company name becomes fzfsirk.
For the second sample, no matter how they play, the company name will always be xxxxxx.
Tags: games, greedy, sortings
Correct Solution:
```
s1 = input()
s2 = input()
n = len(s1)
s1 = sorted(s1)
s2 = sorted(s2)[::-1]
i = 0
j = 0
res = ["?"]*n
rear = n-1
front = 0
Neven = n % 2 == 0
n1 = (n+1)//2 - 1
n2 = n//2 - 1
for k in range(n):
if k % 2 == 0:
if s1[i] < s2[j]:
res[front] = s1[i]
front += 1
i += 1
else:
res[rear] = s1[n1]
rear -= 1
n1 -= 1
else:
if s1[i] < s2[j]:
res[front] = s2[j]
front += 1
j += 1
else:
res[rear] = s2[n2]
rear -= 1
n2 -= 1
print("".join(res))
```
| 58,558
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Oleg the client and Igor the analyst are good friends. However, sometimes they argue over little things. Recently, they started a new company, but they are having trouble finding a name for the company.
To settle this problem, they've decided to play a game. The company name will consist of n letters. Oleg and Igor each have a set of n letters (which might contain multiple copies of the same letter, the sets can be different). Initially, the company name is denoted by n question marks. Oleg and Igor takes turns to play the game, Oleg moves first. In each turn, a player can choose one of the letters c in his set and replace any of the question marks with c. Then, a copy of the letter c is removed from his set. The game ends when all the question marks has been replaced by some letter.
For example, suppose Oleg has the set of letters {i, o, i} and Igor has the set of letters {i, m, o}. One possible game is as follows :
Initially, the company name is ???.
Oleg replaces the second question mark with 'i'. The company name becomes ?i?. The set of letters Oleg have now is {i, o}.
Igor replaces the third question mark with 'o'. The company name becomes ?io. The set of letters Igor have now is {i, m}.
Finally, Oleg replaces the first question mark with 'o'. The company name becomes oio. The set of letters Oleg have now is {i}.
In the end, the company name is oio.
Oleg wants the company name to be as lexicographically small as possible while Igor wants the company name to be as lexicographically large as possible. What will be the company name if Oleg and Igor always play optimally?
A string s = s1s2...sm is called lexicographically smaller than a string t = t1t2...tm (where s ≠ t) if si < ti where i is the smallest index such that si ≠ ti. (so sj = tj for all j < i)
Input
The first line of input contains a string s of length n (1 ≤ n ≤ 3·105). All characters of the string are lowercase English letters. This string denotes the set of letters Oleg has initially.
The second line of input contains a string t of length n. All characters of the string are lowercase English letters. This string denotes the set of letters Igor has initially.
Output
The output should contain a string of n lowercase English letters, denoting the company name if Oleg and Igor plays optimally.
Examples
Input
tinkoff
zscoder
Output
fzfsirk
Input
xxxxxx
xxxxxx
Output
xxxxxx
Input
ioi
imo
Output
ioi
Note
One way to play optimally in the first sample is as follows :
* Initially, the company name is ???????.
* Oleg replaces the first question mark with 'f'. The company name becomes f??????.
* Igor replaces the second question mark with 'z'. The company name becomes fz?????.
* Oleg replaces the third question mark with 'f'. The company name becomes fzf????.
* Igor replaces the fourth question mark with 's'. The company name becomes fzfs???.
* Oleg replaces the fifth question mark with 'i'. The company name becomes fzfsi??.
* Igor replaces the sixth question mark with 'r'. The company name becomes fzfsir?.
* Oleg replaces the seventh question mark with 'k'. The company name becomes fzfsirk.
For the second sample, no matter how they play, the company name will always be xxxxxx.
Tags: games, greedy, sortings
Correct Solution:
```
s=input()
s1=input()
n=len(s1)
sl=[]
sl1=[]
for i in range(n):
sl+=[s[i]]
sl1+=[s1[i]]
ans=sl1[::]
sl1.sort()
sl.sort()
sl1.reverse()
i=0;
i2=(n-1)//2
k=0
k2=(n//2)-1
j=len(s)-1
temp=0
for x in range(len(s1)):
if (x%2==0):
if (sl[i]<sl1[k]) :
ans[temp]=sl[i]
temp+=1
i+=1
elif (sl[i]>=sl1[k]) :
ans[j]=sl[i2]
i2-=1
j-=1
if (x%2==1) :
if (sl[i]<sl1[k]) :
ans[temp]=sl1[k]
temp+=1
k+=1
elif (sl[i]>=sl1[k]) :
ans[j]=sl1[k2]
j-=1
k2-=1
print(''.join(ans))
```
| 58,559
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Oleg the client and Igor the analyst are good friends. However, sometimes they argue over little things. Recently, they started a new company, but they are having trouble finding a name for the company.
To settle this problem, they've decided to play a game. The company name will consist of n letters. Oleg and Igor each have a set of n letters (which might contain multiple copies of the same letter, the sets can be different). Initially, the company name is denoted by n question marks. Oleg and Igor takes turns to play the game, Oleg moves first. In each turn, a player can choose one of the letters c in his set and replace any of the question marks with c. Then, a copy of the letter c is removed from his set. The game ends when all the question marks has been replaced by some letter.
For example, suppose Oleg has the set of letters {i, o, i} and Igor has the set of letters {i, m, o}. One possible game is as follows :
Initially, the company name is ???.
Oleg replaces the second question mark with 'i'. The company name becomes ?i?. The set of letters Oleg have now is {i, o}.
Igor replaces the third question mark with 'o'. The company name becomes ?io. The set of letters Igor have now is {i, m}.
Finally, Oleg replaces the first question mark with 'o'. The company name becomes oio. The set of letters Oleg have now is {i}.
In the end, the company name is oio.
Oleg wants the company name to be as lexicographically small as possible while Igor wants the company name to be as lexicographically large as possible. What will be the company name if Oleg and Igor always play optimally?
A string s = s1s2...sm is called lexicographically smaller than a string t = t1t2...tm (where s ≠ t) if si < ti where i is the smallest index such that si ≠ ti. (so sj = tj for all j < i)
Input
The first line of input contains a string s of length n (1 ≤ n ≤ 3·105). All characters of the string are lowercase English letters. This string denotes the set of letters Oleg has initially.
The second line of input contains a string t of length n. All characters of the string are lowercase English letters. This string denotes the set of letters Igor has initially.
Output
The output should contain a string of n lowercase English letters, denoting the company name if Oleg and Igor plays optimally.
Examples
Input
tinkoff
zscoder
Output
fzfsirk
Input
xxxxxx
xxxxxx
Output
xxxxxx
Input
ioi
imo
Output
ioi
Note
One way to play optimally in the first sample is as follows :
* Initially, the company name is ???????.
* Oleg replaces the first question mark with 'f'. The company name becomes f??????.
* Igor replaces the second question mark with 'z'. The company name becomes fz?????.
* Oleg replaces the third question mark with 'f'. The company name becomes fzf????.
* Igor replaces the fourth question mark with 's'. The company name becomes fzfs???.
* Oleg replaces the fifth question mark with 'i'. The company name becomes fzfsi??.
* Igor replaces the sixth question mark with 'r'. The company name becomes fzfsir?.
* Oleg replaces the seventh question mark with 'k'. The company name becomes fzfsirk.
For the second sample, no matter how they play, the company name will always be xxxxxx.
Tags: games, greedy, sortings
Correct Solution:
```
import sys
from math import sqrt
def solve():
s = input() # Oleg's letters
t = input() # Igor's letters
n = len(s)
s = sorted(s)[:(n + 1) // 2]
t = sorted(t, reverse=True)[:n // 2]
'''
print(s)
print(t)
'''
ans = [None] * n
ansl = 0
ansr = n - 1
olgl = 0
olgr = len(s) - 1
igol = 0
igor = len(t) - 1
for i in range(n):
if i % 2 == 0:
if igol > igor or s[olgl] < t[igol]:
ans[ansl] = s[olgl]
ansl += 1
olgl += 1
else:
ans[ansr] = s[olgr]
ansr -= 1
olgr -= 1
pass
else:
if olgl > olgr or t[igol] > s[olgl]:
ans[ansl] = t[igol]
ansl += 1
igol += 1
else:
ans[ansr] = t[igor]
ansr -= 1
igor -= 1
pass
# print(ans)
ans = ''.join(ans)
print(ans)
if __name__ == '__main__':
solve()
```
| 58,560
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
An African crossword is a rectangular table n × m in size. Each cell of the table contains exactly one letter. This table (it is also referred to as grid) contains some encrypted word that needs to be decoded.
To solve the crossword you should cross out all repeated letters in rows and columns. In other words, a letter should only be crossed out if and only if the corresponding column or row contains at least one more letter that is exactly the same. Besides, all such letters are crossed out simultaneously.
When all repeated letters have been crossed out, we should write the remaining letters in a string. The letters that occupy a higher position follow before the letters that occupy a lower position. If the letters are located in one row, then the letter to the left goes first. The resulting word is the answer to the problem.
You are suggested to solve an African crossword and print the word encrypted there.
Input
The first line contains two integers n and m (1 ≤ n, m ≤ 100). Next n lines contain m lowercase Latin letters each. That is the crossword grid.
Output
Print the encrypted word on a single line. It is guaranteed that the answer consists of at least one letter.
Examples
Input
3 3
cba
bcd
cbc
Output
abcd
Input
5 5
fcofd
ooedo
afaoa
rdcdf
eofsf
Output
codeforces
Tags: implementation, strings
Correct Solution:
```
n, m = map(int, input().split())
a = [input() for i in range(n)]
ans = ''
for i in range(n):
for j in range(m):
if a[i].count(a[i][j]) == 1 and ''.join(a[k][j] for k in range(n)).count(a[i][j]) == 1:
ans += a[i][j]
print(ans)
```
| 58,612
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
An African crossword is a rectangular table n × m in size. Each cell of the table contains exactly one letter. This table (it is also referred to as grid) contains some encrypted word that needs to be decoded.
To solve the crossword you should cross out all repeated letters in rows and columns. In other words, a letter should only be crossed out if and only if the corresponding column or row contains at least one more letter that is exactly the same. Besides, all such letters are crossed out simultaneously.
When all repeated letters have been crossed out, we should write the remaining letters in a string. The letters that occupy a higher position follow before the letters that occupy a lower position. If the letters are located in one row, then the letter to the left goes first. The resulting word is the answer to the problem.
You are suggested to solve an African crossword and print the word encrypted there.
Input
The first line contains two integers n and m (1 ≤ n, m ≤ 100). Next n lines contain m lowercase Latin letters each. That is the crossword grid.
Output
Print the encrypted word on a single line. It is guaranteed that the answer consists of at least one letter.
Examples
Input
3 3
cba
bcd
cbc
Output
abcd
Input
5 5
fcofd
ooedo
afaoa
rdcdf
eofsf
Output
codeforces
Tags: implementation, strings
Correct Solution:
```
import sys
def readlines(type=int):
return list(map(type, sys.stdin.readline().split()))
def read(type=int):
return type(sys.stdin.readline().strip())
joint = lambda it, sep=" ": sep.join(
[str(i) if type(i) != list else sep.join(map(str, i)) for i in it])
def solve(crossword, n, m):
rowarr = [set() for _ in range(n)]
colarr = [set() for _ in range(m)]
for i, row in enumerate(crossword):
seen = set()
for letter in row:
if letter not in seen:
seen.add(letter)
else:
rowarr[i].add(letter)
for i in range(m):
seen = set()
for j in range(n):
if crossword[j][i] not in seen:
seen.add(crossword[j][i])
else:
colarr[i].add(crossword[j][i])
solution = ""
for i in range(n):
for j in range(m):
if crossword[i][j] not in rowarr[i] and crossword[i][j] not in colarr[j]:
solution += crossword[i][j]
return solution
def main():
n, m = readlines()
crossword = [read(str) for _ in range(n)]
print(solve(crossword, n, m))
main()
```
| 58,613
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
An African crossword is a rectangular table n × m in size. Each cell of the table contains exactly one letter. This table (it is also referred to as grid) contains some encrypted word that needs to be decoded.
To solve the crossword you should cross out all repeated letters in rows and columns. In other words, a letter should only be crossed out if and only if the corresponding column or row contains at least one more letter that is exactly the same. Besides, all such letters are crossed out simultaneously.
When all repeated letters have been crossed out, we should write the remaining letters in a string. The letters that occupy a higher position follow before the letters that occupy a lower position. If the letters are located in one row, then the letter to the left goes first. The resulting word is the answer to the problem.
You are suggested to solve an African crossword and print the word encrypted there.
Input
The first line contains two integers n and m (1 ≤ n, m ≤ 100). Next n lines contain m lowercase Latin letters each. That is the crossword grid.
Output
Print the encrypted word on a single line. It is guaranteed that the answer consists of at least one letter.
Examples
Input
3 3
cba
bcd
cbc
Output
abcd
Input
5 5
fcofd
ooedo
afaoa
rdcdf
eofsf
Output
codeforces
Tags: implementation, strings
Correct Solution:
```
X = list(map(int, input().split()))
Sentence, Answer = "", ""
for i in range(X[0]):
Sentence += input()
for i in range(X[0]):
Temp = Sentence[i * X[1]:(i + 1) * X[1]]
for j in range(X[1]):
if Temp.count(Temp[j]) == 1 and Sentence[j::X[1]].count(Temp[j]) == 1:
Answer += Temp[j]
print(Answer)
# UB_CodeForces
# Advice: Falling down is an accident, staying down is a choice
# Location: Behind my desk in Bojnurd
# Caption: Waiting for going to Tehran
# CodeNumber: 683
```
| 58,614
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
An African crossword is a rectangular table n × m in size. Each cell of the table contains exactly one letter. This table (it is also referred to as grid) contains some encrypted word that needs to be decoded.
To solve the crossword you should cross out all repeated letters in rows and columns. In other words, a letter should only be crossed out if and only if the corresponding column or row contains at least one more letter that is exactly the same. Besides, all such letters are crossed out simultaneously.
When all repeated letters have been crossed out, we should write the remaining letters in a string. The letters that occupy a higher position follow before the letters that occupy a lower position. If the letters are located in one row, then the letter to the left goes first. The resulting word is the answer to the problem.
You are suggested to solve an African crossword and print the word encrypted there.
Input
The first line contains two integers n and m (1 ≤ n, m ≤ 100). Next n lines contain m lowercase Latin letters each. That is the crossword grid.
Output
Print the encrypted word on a single line. It is guaranteed that the answer consists of at least one letter.
Examples
Input
3 3
cba
bcd
cbc
Output
abcd
Input
5 5
fcofd
ooedo
afaoa
rdcdf
eofsf
Output
codeforces
Tags: implementation, strings
Correct Solution:
```
# 90B
from sys import stdin
__author__ = 'artyom'
def index(ch):
return ord(ch) - 97
n, m = map(int, stdin.readline().strip().split())
grid = []
for _ in range(n):
grid.append(stdin.readline().strip())
a, res = [0] * 26, [[''] * m for __ in range(n)]
for j in range(m):
for i in range(n):
a[index(grid[i][j])] += 1
for i in range(n):
ind = index(grid[i][j])
res[i][j] = grid[i][j] if a[ind] == 1 and res[i][j] != '.' else '.'
a[ind] = 0
for i in range(n):
for j in range(m):
a[index(grid[i][j])] += 1
for j in range(m):
ind = index(grid[i][j])
res[i][j] = grid[i][j] if a[ind] == 1 and res[i][j] != '.' else '.'
a[ind] = 0
st = ''
for i in range(n):
for j in range(m):
if res[i][j] != '.':
st += res[i][j]
print(st)
```
| 58,615
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
An African crossword is a rectangular table n × m in size. Each cell of the table contains exactly one letter. This table (it is also referred to as grid) contains some encrypted word that needs to be decoded.
To solve the crossword you should cross out all repeated letters in rows and columns. In other words, a letter should only be crossed out if and only if the corresponding column or row contains at least one more letter that is exactly the same. Besides, all such letters are crossed out simultaneously.
When all repeated letters have been crossed out, we should write the remaining letters in a string. The letters that occupy a higher position follow before the letters that occupy a lower position. If the letters are located in one row, then the letter to the left goes first. The resulting word is the answer to the problem.
You are suggested to solve an African crossword and print the word encrypted there.
Input
The first line contains two integers n and m (1 ≤ n, m ≤ 100). Next n lines contain m lowercase Latin letters each. That is the crossword grid.
Output
Print the encrypted word on a single line. It is guaranteed that the answer consists of at least one letter.
Examples
Input
3 3
cba
bcd
cbc
Output
abcd
Input
5 5
fcofd
ooedo
afaoa
rdcdf
eofsf
Output
codeforces
Tags: implementation, strings
Correct Solution:
```
x,y=map(int,(input()).split())
a=""
for __ in range(x):
a+=input()
i=0
b=""
while i<x*y:
n=i%y
f=0
m=i-n
for j in range(m,m+y):
if a[j]==a[i] and i!=j:
f=1
for j in range(n,len(a),y):
if a[j]==a[i] and i!=j:
f=1
if f==0:
b+=a[i]
i+=1
print(b)
```
| 58,616
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
An African crossword is a rectangular table n × m in size. Each cell of the table contains exactly one letter. This table (it is also referred to as grid) contains some encrypted word that needs to be decoded.
To solve the crossword you should cross out all repeated letters in rows and columns. In other words, a letter should only be crossed out if and only if the corresponding column or row contains at least one more letter that is exactly the same. Besides, all such letters are crossed out simultaneously.
When all repeated letters have been crossed out, we should write the remaining letters in a string. The letters that occupy a higher position follow before the letters that occupy a lower position. If the letters are located in one row, then the letter to the left goes first. The resulting word is the answer to the problem.
You are suggested to solve an African crossword and print the word encrypted there.
Input
The first line contains two integers n and m (1 ≤ n, m ≤ 100). Next n lines contain m lowercase Latin letters each. That is the crossword grid.
Output
Print the encrypted word on a single line. It is guaranteed that the answer consists of at least one letter.
Examples
Input
3 3
cba
bcd
cbc
Output
abcd
Input
5 5
fcofd
ooedo
afaoa
rdcdf
eofsf
Output
codeforces
Tags: implementation, strings
Correct Solution:
```
n , m = map(int,input().split())
arr = []
for i in range(n):
arr.append(input())
res = list(zip(*arr))
for i in range(n):
for j in range(m):
if arr[i].count(arr[i][j])==1:
if res[j].count(arr[i][j])==1:
print(arr[i][j],end="")
```
| 58,617
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
An African crossword is a rectangular table n × m in size. Each cell of the table contains exactly one letter. This table (it is also referred to as grid) contains some encrypted word that needs to be decoded.
To solve the crossword you should cross out all repeated letters in rows and columns. In other words, a letter should only be crossed out if and only if the corresponding column or row contains at least one more letter that is exactly the same. Besides, all such letters are crossed out simultaneously.
When all repeated letters have been crossed out, we should write the remaining letters in a string. The letters that occupy a higher position follow before the letters that occupy a lower position. If the letters are located in one row, then the letter to the left goes first. The resulting word is the answer to the problem.
You are suggested to solve an African crossword and print the word encrypted there.
Input
The first line contains two integers n and m (1 ≤ n, m ≤ 100). Next n lines contain m lowercase Latin letters each. That is the crossword grid.
Output
Print the encrypted word on a single line. It is guaranteed that the answer consists of at least one letter.
Examples
Input
3 3
cba
bcd
cbc
Output
abcd
Input
5 5
fcofd
ooedo
afaoa
rdcdf
eofsf
Output
codeforces
Tags: implementation, strings
Correct Solution:
```
def main():
n, m = map(int, input().split())
grid = [list(input()) for _ in range(n)]
res = ''
for r in range(n):
for c in range(m):
cur = grid[r][c]
found = False
for i in range(m):
if i != c and grid[r][i] == cur:
found = True
for i in range(n):
if i != r and grid[i][c] == cur:
found = True
if not found:
res += cur
print(res)
if __name__ == '__main__':
main()
```
| 58,618
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
An African crossword is a rectangular table n × m in size. Each cell of the table contains exactly one letter. This table (it is also referred to as grid) contains some encrypted word that needs to be decoded.
To solve the crossword you should cross out all repeated letters in rows and columns. In other words, a letter should only be crossed out if and only if the corresponding column or row contains at least one more letter that is exactly the same. Besides, all such letters are crossed out simultaneously.
When all repeated letters have been crossed out, we should write the remaining letters in a string. The letters that occupy a higher position follow before the letters that occupy a lower position. If the letters are located in one row, then the letter to the left goes first. The resulting word is the answer to the problem.
You are suggested to solve an African crossword and print the word encrypted there.
Input
The first line contains two integers n and m (1 ≤ n, m ≤ 100). Next n lines contain m lowercase Latin letters each. That is the crossword grid.
Output
Print the encrypted word on a single line. It is guaranteed that the answer consists of at least one letter.
Examples
Input
3 3
cba
bcd
cbc
Output
abcd
Input
5 5
fcofd
ooedo
afaoa
rdcdf
eofsf
Output
codeforces
Tags: implementation, strings
Correct Solution:
```
import re
[n, m], rows = [int(i) for i in input().split()], []
cols = [''] * m
for i in range(n):
rows.append(input())
for row in rows:
for i, char in enumerate(row):
cols[i] += char
rows_copy, cols_copy = list(rows), list(cols)
for i, row in enumerate(rows_copy):
for j, char in enumerate(row):
if row.count(char) > 1 or cols_copy[j].count(char) > 1:
rows[i] = re.sub(char, '_', rows[i])
cols[j] = re.sub(char, '_', cols[j])
ans = []
for row in rows:
for i, c in enumerate(row):
if c != '_' and c in cols[i]:
ans.append(c)
print(''.join([str(x) for x in ans]))
```
| 58,619
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
IA has so many colorful magnets on her fridge! Exactly one letter is written on each magnet, 'a' or 'b'. She loves to play with them, placing all magnets in a row. However, the girl is quickly bored and usually thinks how to make her entertainment more interesting.
Today, when IA looked at the fridge, she noticed that the word formed by magnets is really messy. "It would look much better when I'll swap some of them!" — thought the girl — "but how to do it?". After a while, she got an idea. IA will look at all prefixes with lengths from 1 to the length of the word and for each prefix she will either reverse this prefix or leave it as it is. She will consider the prefixes in the fixed order: from the shortest to the largest. She wants to get the lexicographically smallest possible word after she considers all prefixes. Can you help her, telling which prefixes should be chosen for reversing?
A string a is lexicographically smaller than a string b if and only if one of the following holds:
* a is a prefix of b, but a ≠ b;
* in the first position where a and b differ, the string a has a letter that appears earlier in the alphabet than the corresponding letter in b.
Input
The first and the only line contains a string s (1 ≤ |s| ≤ 1000), describing the initial string formed by magnets. The string s consists only of characters 'a' and 'b'.
Output
Output exactly |s| integers. If IA should reverse the i-th prefix (that is, the substring from 1 to i), the i-th integer should be equal to 1, and it should be equal to 0 otherwise.
If there are multiple possible sequences leading to the optimal answer, print any of them.
Examples
Input
bbab
Output
0 1 1 0
Input
aaaaa
Output
1 0 0 0 1
Note
In the first example, IA can reverse the second and the third prefix and get a string "abbb". She cannot get better result, since it is also lexicographically smallest string obtainable by permuting characters of the initial string.
In the second example, she can reverse any subset of prefixes — all letters are 'a'.
Tags: constructive algorithms, greedy, implementation
Correct Solution:
```
import sys
input = lambda :sys.stdin.readline().rstrip()
s=[*input()]
ans=[0]*(len(s))
for i in range(1,len(s)):
if s[i]=='a':
ans[i-1]^=1
ans[i]=1
print(*ans)
```
| 58,832
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
IA has so many colorful magnets on her fridge! Exactly one letter is written on each magnet, 'a' or 'b'. She loves to play with them, placing all magnets in a row. However, the girl is quickly bored and usually thinks how to make her entertainment more interesting.
Today, when IA looked at the fridge, she noticed that the word formed by magnets is really messy. "It would look much better when I'll swap some of them!" — thought the girl — "but how to do it?". After a while, she got an idea. IA will look at all prefixes with lengths from 1 to the length of the word and for each prefix she will either reverse this prefix or leave it as it is. She will consider the prefixes in the fixed order: from the shortest to the largest. She wants to get the lexicographically smallest possible word after she considers all prefixes. Can you help her, telling which prefixes should be chosen for reversing?
A string a is lexicographically smaller than a string b if and only if one of the following holds:
* a is a prefix of b, but a ≠ b;
* in the first position where a and b differ, the string a has a letter that appears earlier in the alphabet than the corresponding letter in b.
Input
The first and the only line contains a string s (1 ≤ |s| ≤ 1000), describing the initial string formed by magnets. The string s consists only of characters 'a' and 'b'.
Output
Output exactly |s| integers. If IA should reverse the i-th prefix (that is, the substring from 1 to i), the i-th integer should be equal to 1, and it should be equal to 0 otherwise.
If there are multiple possible sequences leading to the optimal answer, print any of them.
Examples
Input
bbab
Output
0 1 1 0
Input
aaaaa
Output
1 0 0 0 1
Note
In the first example, IA can reverse the second and the third prefix and get a string "abbb". She cannot get better result, since it is also lexicographically smallest string obtainable by permuting characters of the initial string.
In the second example, she can reverse any subset of prefixes — all letters are 'a'.
Tags: constructive algorithms, greedy, implementation
Correct Solution:
```
s = input()
ans = [0]*len(s)
for i in range(1, len(s)):
if s[i] != s[i-1]:
ans[i-1] = 1
ans[-1] = 1 if s[-1] == 'a' else 0
print(*ans)
```
| 58,833
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
IA has so many colorful magnets on her fridge! Exactly one letter is written on each magnet, 'a' or 'b'. She loves to play with them, placing all magnets in a row. However, the girl is quickly bored and usually thinks how to make her entertainment more interesting.
Today, when IA looked at the fridge, she noticed that the word formed by magnets is really messy. "It would look much better when I'll swap some of them!" — thought the girl — "but how to do it?". After a while, she got an idea. IA will look at all prefixes with lengths from 1 to the length of the word and for each prefix she will either reverse this prefix or leave it as it is. She will consider the prefixes in the fixed order: from the shortest to the largest. She wants to get the lexicographically smallest possible word after she considers all prefixes. Can you help her, telling which prefixes should be chosen for reversing?
A string a is lexicographically smaller than a string b if and only if one of the following holds:
* a is a prefix of b, but a ≠ b;
* in the first position where a and b differ, the string a has a letter that appears earlier in the alphabet than the corresponding letter in b.
Input
The first and the only line contains a string s (1 ≤ |s| ≤ 1000), describing the initial string formed by magnets. The string s consists only of characters 'a' and 'b'.
Output
Output exactly |s| integers. If IA should reverse the i-th prefix (that is, the substring from 1 to i), the i-th integer should be equal to 1, and it should be equal to 0 otherwise.
If there are multiple possible sequences leading to the optimal answer, print any of them.
Examples
Input
bbab
Output
0 1 1 0
Input
aaaaa
Output
1 0 0 0 1
Note
In the first example, IA can reverse the second and the third prefix and get a string "abbb". She cannot get better result, since it is also lexicographically smallest string obtainable by permuting characters of the initial string.
In the second example, she can reverse any subset of prefixes — all letters are 'a'.
Tags: constructive algorithms, greedy, implementation
Correct Solution:
```
s = input()
l = []
i = 0
while i < len(s):
l.append(0)
while i < len(s) and s[i] == 'b':
l[-1] += 1
i += 1
l.append(0)
while i < len(s) and s[i] == 'a':
l[-1] += 1
i += 1
# print(l)
i = 0
res = []
for j, e in enumerate(l):
i += e
if j % 2 == 0:
if i != e and l[j + 1] > 0:
if e:
res.append(i - 1)
elif e:
res.append(i - 1)
v = ['0'] * len(s)
for e in res:
v[e] = '1'
print(' '.join(v))
```
| 58,834
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
IA has so many colorful magnets on her fridge! Exactly one letter is written on each magnet, 'a' or 'b'. She loves to play with them, placing all magnets in a row. However, the girl is quickly bored and usually thinks how to make her entertainment more interesting.
Today, when IA looked at the fridge, she noticed that the word formed by magnets is really messy. "It would look much better when I'll swap some of them!" — thought the girl — "but how to do it?". After a while, she got an idea. IA will look at all prefixes with lengths from 1 to the length of the word and for each prefix she will either reverse this prefix or leave it as it is. She will consider the prefixes in the fixed order: from the shortest to the largest. She wants to get the lexicographically smallest possible word after she considers all prefixes. Can you help her, telling which prefixes should be chosen for reversing?
A string a is lexicographically smaller than a string b if and only if one of the following holds:
* a is a prefix of b, but a ≠ b;
* in the first position where a and b differ, the string a has a letter that appears earlier in the alphabet than the corresponding letter in b.
Input
The first and the only line contains a string s (1 ≤ |s| ≤ 1000), describing the initial string formed by magnets. The string s consists only of characters 'a' and 'b'.
Output
Output exactly |s| integers. If IA should reverse the i-th prefix (that is, the substring from 1 to i), the i-th integer should be equal to 1, and it should be equal to 0 otherwise.
If there are multiple possible sequences leading to the optimal answer, print any of them.
Examples
Input
bbab
Output
0 1 1 0
Input
aaaaa
Output
1 0 0 0 1
Note
In the first example, IA can reverse the second and the third prefix and get a string "abbb". She cannot get better result, since it is also lexicographically smallest string obtainable by permuting characters of the initial string.
In the second example, she can reverse any subset of prefixes — all letters are 'a'.
Tags: constructive algorithms, greedy, implementation
Correct Solution:
```
"""
Greedy solution where if we are looking at a, then move b to front as much as possible
"""
def solve(s):
res = [0 for _ in range(len(s))]
for i in range(1, len(s)):
if s[i] == "a":
res[i] = 1
res[i-1] = 1 - res[i-1]
return res
lst = list((input()))
print ((" ").join(list(map(str, solve(lst)))))
```
| 58,835
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
IA has so many colorful magnets on her fridge! Exactly one letter is written on each magnet, 'a' or 'b'. She loves to play with them, placing all magnets in a row. However, the girl is quickly bored and usually thinks how to make her entertainment more interesting.
Today, when IA looked at the fridge, she noticed that the word formed by magnets is really messy. "It would look much better when I'll swap some of them!" — thought the girl — "but how to do it?". After a while, she got an idea. IA will look at all prefixes with lengths from 1 to the length of the word and for each prefix she will either reverse this prefix or leave it as it is. She will consider the prefixes in the fixed order: from the shortest to the largest. She wants to get the lexicographically smallest possible word after she considers all prefixes. Can you help her, telling which prefixes should be chosen for reversing?
A string a is lexicographically smaller than a string b if and only if one of the following holds:
* a is a prefix of b, but a ≠ b;
* in the first position where a and b differ, the string a has a letter that appears earlier in the alphabet than the corresponding letter in b.
Input
The first and the only line contains a string s (1 ≤ |s| ≤ 1000), describing the initial string formed by magnets. The string s consists only of characters 'a' and 'b'.
Output
Output exactly |s| integers. If IA should reverse the i-th prefix (that is, the substring from 1 to i), the i-th integer should be equal to 1, and it should be equal to 0 otherwise.
If there are multiple possible sequences leading to the optimal answer, print any of them.
Examples
Input
bbab
Output
0 1 1 0
Input
aaaaa
Output
1 0 0 0 1
Note
In the first example, IA can reverse the second and the third prefix and get a string "abbb". She cannot get better result, since it is also lexicographically smallest string obtainable by permuting characters of the initial string.
In the second example, she can reverse any subset of prefixes — all letters are 'a'.
Tags: constructive algorithms, greedy, implementation
Correct Solution:
```
from itertools import groupby
s = "#"+input()
l = len(s)
# ans = [0]*l
# for i in range(1,l):
# if s[i] == "a":
# ans[i-1] ^= 1
# ans[i] = 1
# print(*ans[1:])
ss = s[1:]
ans1 = [0]*(l-1)
gb = [list(g) for k,g in groupby(ss)]
ll,first_a,turn_a = 0,False,False
for i in gb:
if i[0] == "a":
if not first_a:
ll += len(i)
ans1[ll-1] = 1
first_a = True
turn_a = True
else:
ll += len(i)
ans1[ll-1] = 1
turn_a = True
else:
ll += len(i)
ans1[ll-1] = 1
turn_a = False
if not turn_a:
ans1[ll-1] = 0
print(*ans1)
```
| 58,836
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
IA has so many colorful magnets on her fridge! Exactly one letter is written on each magnet, 'a' or 'b'. She loves to play with them, placing all magnets in a row. However, the girl is quickly bored and usually thinks how to make her entertainment more interesting.
Today, when IA looked at the fridge, she noticed that the word formed by magnets is really messy. "It would look much better when I'll swap some of them!" — thought the girl — "but how to do it?". After a while, she got an idea. IA will look at all prefixes with lengths from 1 to the length of the word and for each prefix she will either reverse this prefix or leave it as it is. She will consider the prefixes in the fixed order: from the shortest to the largest. She wants to get the lexicographically smallest possible word after she considers all prefixes. Can you help her, telling which prefixes should be chosen for reversing?
A string a is lexicographically smaller than a string b if and only if one of the following holds:
* a is a prefix of b, but a ≠ b;
* in the first position where a and b differ, the string a has a letter that appears earlier in the alphabet than the corresponding letter in b.
Input
The first and the only line contains a string s (1 ≤ |s| ≤ 1000), describing the initial string formed by magnets. The string s consists only of characters 'a' and 'b'.
Output
Output exactly |s| integers. If IA should reverse the i-th prefix (that is, the substring from 1 to i), the i-th integer should be equal to 1, and it should be equal to 0 otherwise.
If there are multiple possible sequences leading to the optimal answer, print any of them.
Examples
Input
bbab
Output
0 1 1 0
Input
aaaaa
Output
1 0 0 0 1
Note
In the first example, IA can reverse the second and the third prefix and get a string "abbb". She cannot get better result, since it is also lexicographically smallest string obtainable by permuting characters of the initial string.
In the second example, she can reverse any subset of prefixes — all letters are 'a'.
Tags: constructive algorithms, greedy, implementation
Correct Solution:
```
s=input()
n=len(s)
a=s.count('a')
s1=''
count=[]
i=0
while i<n:
count.append(0)
s1=s1+s[i]
while i+count[-1]<n and s[i+count[-1]]==s[i]:
count[-1]+=1
i+=count[-1]
#print(s1)
#print(count)
nc=len(count)
if s1[nc-1]=='a':
for i in range(nc):
for j in range(1,count[i]):
print(0,end=' ')
print(1,end=' ')
else:
bs=0
while bs+1<=n and s[-bs-1]=='b':
bs+=1
for i in range(nc-1):
for j in range(1,count[i]):
print(0,end=' ')
print(1,end=' ')
for i in range(bs):
print(0,end=' ')
```
| 58,837
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
IA has so many colorful magnets on her fridge! Exactly one letter is written on each magnet, 'a' or 'b'. She loves to play with them, placing all magnets in a row. However, the girl is quickly bored and usually thinks how to make her entertainment more interesting.
Today, when IA looked at the fridge, she noticed that the word formed by magnets is really messy. "It would look much better when I'll swap some of them!" — thought the girl — "but how to do it?". After a while, she got an idea. IA will look at all prefixes with lengths from 1 to the length of the word and for each prefix she will either reverse this prefix or leave it as it is. She will consider the prefixes in the fixed order: from the shortest to the largest. She wants to get the lexicographically smallest possible word after she considers all prefixes. Can you help her, telling which prefixes should be chosen for reversing?
A string a is lexicographically smaller than a string b if and only if one of the following holds:
* a is a prefix of b, but a ≠ b;
* in the first position where a and b differ, the string a has a letter that appears earlier in the alphabet than the corresponding letter in b.
Input
The first and the only line contains a string s (1 ≤ |s| ≤ 1000), describing the initial string formed by magnets. The string s consists only of characters 'a' and 'b'.
Output
Output exactly |s| integers. If IA should reverse the i-th prefix (that is, the substring from 1 to i), the i-th integer should be equal to 1, and it should be equal to 0 otherwise.
If there are multiple possible sequences leading to the optimal answer, print any of them.
Examples
Input
bbab
Output
0 1 1 0
Input
aaaaa
Output
1 0 0 0 1
Note
In the first example, IA can reverse the second and the third prefix and get a string "abbb". She cannot get better result, since it is also lexicographically smallest string obtainable by permuting characters of the initial string.
In the second example, she can reverse any subset of prefixes — all letters are 'a'.
Tags: constructive algorithms, greedy, implementation
Correct Solution:
```
s = input()
def swap(i):
return s[:i:-1] + s[i + 1:]
for e in range(len(s) - 1):
if s[e] != s[e + 1]:
print(1, end=' ')
# s = swap(e)
# print(s)
else:
print(0, end=' ')
if s[-1] == 'a':
print(1, end=' ')
else:
print(0)
```
| 58,838
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
IA has so many colorful magnets on her fridge! Exactly one letter is written on each magnet, 'a' or 'b'. She loves to play with them, placing all magnets in a row. However, the girl is quickly bored and usually thinks how to make her entertainment more interesting.
Today, when IA looked at the fridge, she noticed that the word formed by magnets is really messy. "It would look much better when I'll swap some of them!" — thought the girl — "but how to do it?". After a while, she got an idea. IA will look at all prefixes with lengths from 1 to the length of the word and for each prefix she will either reverse this prefix or leave it as it is. She will consider the prefixes in the fixed order: from the shortest to the largest. She wants to get the lexicographically smallest possible word after she considers all prefixes. Can you help her, telling which prefixes should be chosen for reversing?
A string a is lexicographically smaller than a string b if and only if one of the following holds:
* a is a prefix of b, but a ≠ b;
* in the first position where a and b differ, the string a has a letter that appears earlier in the alphabet than the corresponding letter in b.
Input
The first and the only line contains a string s (1 ≤ |s| ≤ 1000), describing the initial string formed by magnets. The string s consists only of characters 'a' and 'b'.
Output
Output exactly |s| integers. If IA should reverse the i-th prefix (that is, the substring from 1 to i), the i-th integer should be equal to 1, and it should be equal to 0 otherwise.
If there are multiple possible sequences leading to the optimal answer, print any of them.
Examples
Input
bbab
Output
0 1 1 0
Input
aaaaa
Output
1 0 0 0 1
Note
In the first example, IA can reverse the second and the third prefix and get a string "abbb". She cannot get better result, since it is also lexicographically smallest string obtainable by permuting characters of the initial string.
In the second example, she can reverse any subset of prefixes — all letters are 'a'.
Tags: constructive algorithms, greedy, implementation
Correct Solution:
```
def not_last(c):
if c == 'a':
return 'b'
return 'a'
s = input()
last = 'b'
res = []
for i in range(len(s) - 1):
if s[i + 1] == last:
res += [0]
else:
last = not_last(last)
res += [1]
if last == 'a':
res += [1]
else:
res += [0]
print(' '.join(list(map(str, res))))
```
| 58,839
|
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
IA has so many colorful magnets on her fridge! Exactly one letter is written on each magnet, 'a' or 'b'. She loves to play with them, placing all magnets in a row. However, the girl is quickly bored and usually thinks how to make her entertainment more interesting.
Today, when IA looked at the fridge, she noticed that the word formed by magnets is really messy. "It would look much better when I'll swap some of them!" — thought the girl — "but how to do it?". After a while, she got an idea. IA will look at all prefixes with lengths from 1 to the length of the word and for each prefix she will either reverse this prefix or leave it as it is. She will consider the prefixes in the fixed order: from the shortest to the largest. She wants to get the lexicographically smallest possible word after she considers all prefixes. Can you help her, telling which prefixes should be chosen for reversing?
A string a is lexicographically smaller than a string b if and only if one of the following holds:
* a is a prefix of b, but a ≠ b;
* in the first position where a and b differ, the string a has a letter that appears earlier in the alphabet than the corresponding letter in b.
Input
The first and the only line contains a string s (1 ≤ |s| ≤ 1000), describing the initial string formed by magnets. The string s consists only of characters 'a' and 'b'.
Output
Output exactly |s| integers. If IA should reverse the i-th prefix (that is, the substring from 1 to i), the i-th integer should be equal to 1, and it should be equal to 0 otherwise.
If there are multiple possible sequences leading to the optimal answer, print any of them.
Examples
Input
bbab
Output
0 1 1 0
Input
aaaaa
Output
1 0 0 0 1
Note
In the first example, IA can reverse the second and the third prefix and get a string "abbb". She cannot get better result, since it is also lexicographically smallest string obtainable by permuting characters of the initial string.
In the second example, she can reverse any subset of prefixes — all letters are 'a'.
Submitted Solution:
```
from sys import stdin,stdout
a = list(input())
b = sorted(a)
l = len(a)
ans = ['0' for i in range(l)]
for i in range(1,l):
if a == b:
break
if a[0] == 'a':
if a[i] == 'a':
a[0:i-1] = a[i-1:0:-1]
ans[i-1] = '1'
else:
if a[i] == 'b':
a[0:i-1] = a[i-1:0:-1]
ans[i-1] = '1'
if a[0] == 'b':
ans[l-1] = '1'
stdout.write(' '.join(ans))
```
Yes
| 58,840
|
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|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
IA has so many colorful magnets on her fridge! Exactly one letter is written on each magnet, 'a' or 'b'. She loves to play with them, placing all magnets in a row. However, the girl is quickly bored and usually thinks how to make her entertainment more interesting.
Today, when IA looked at the fridge, she noticed that the word formed by magnets is really messy. "It would look much better when I'll swap some of them!" — thought the girl — "but how to do it?". After a while, she got an idea. IA will look at all prefixes with lengths from 1 to the length of the word and for each prefix she will either reverse this prefix or leave it as it is. She will consider the prefixes in the fixed order: from the shortest to the largest. She wants to get the lexicographically smallest possible word after she considers all prefixes. Can you help her, telling which prefixes should be chosen for reversing?
A string a is lexicographically smaller than a string b if and only if one of the following holds:
* a is a prefix of b, but a ≠ b;
* in the first position where a and b differ, the string a has a letter that appears earlier in the alphabet than the corresponding letter in b.
Input
The first and the only line contains a string s (1 ≤ |s| ≤ 1000), describing the initial string formed by magnets. The string s consists only of characters 'a' and 'b'.
Output
Output exactly |s| integers. If IA should reverse the i-th prefix (that is, the substring from 1 to i), the i-th integer should be equal to 1, and it should be equal to 0 otherwise.
If there are multiple possible sequences leading to the optimal answer, print any of them.
Examples
Input
bbab
Output
0 1 1 0
Input
aaaaa
Output
1 0 0 0 1
Note
In the first example, IA can reverse the second and the third prefix and get a string "abbb". She cannot get better result, since it is also lexicographically smallest string obtainable by permuting characters of the initial string.
In the second example, she can reverse any subset of prefixes — all letters are 'a'.
Submitted Solution:
```
a=list(input())
b=[]
c=0
for i in range(len(a)-1):
if a[i]!=a[i+1]:
b.append(i)
d=[0]*len(a)
for i in range(1,len(b)):
d[b[i]]=1
if a[-1]=="a":
d[-1]=1
print(*d)
```
Yes
| 58,841
|
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
IA has so many colorful magnets on her fridge! Exactly one letter is written on each magnet, 'a' or 'b'. She loves to play with them, placing all magnets in a row. However, the girl is quickly bored and usually thinks how to make her entertainment more interesting.
Today, when IA looked at the fridge, she noticed that the word formed by magnets is really messy. "It would look much better when I'll swap some of them!" — thought the girl — "but how to do it?". After a while, she got an idea. IA will look at all prefixes with lengths from 1 to the length of the word and for each prefix she will either reverse this prefix or leave it as it is. She will consider the prefixes in the fixed order: from the shortest to the largest. She wants to get the lexicographically smallest possible word after she considers all prefixes. Can you help her, telling which prefixes should be chosen for reversing?
A string a is lexicographically smaller than a string b if and only if one of the following holds:
* a is a prefix of b, but a ≠ b;
* in the first position where a and b differ, the string a has a letter that appears earlier in the alphabet than the corresponding letter in b.
Input
The first and the only line contains a string s (1 ≤ |s| ≤ 1000), describing the initial string formed by magnets. The string s consists only of characters 'a' and 'b'.
Output
Output exactly |s| integers. If IA should reverse the i-th prefix (that is, the substring from 1 to i), the i-th integer should be equal to 1, and it should be equal to 0 otherwise.
If there are multiple possible sequences leading to the optimal answer, print any of them.
Examples
Input
bbab
Output
0 1 1 0
Input
aaaaa
Output
1 0 0 0 1
Note
In the first example, IA can reverse the second and the third prefix and get a string "abbb". She cannot get better result, since it is also lexicographically smallest string obtainable by permuting characters of the initial string.
In the second example, she can reverse any subset of prefixes — all letters are 'a'.
Submitted Solution:
```
s=input()
n=len(s)
ans=[]
for i in range(n-1):
if s[i]!=s[i+1]:
ans.append(1)
else:
ans.append(0)
if s[-1]=="a":
ans.append(1)
else:
ans.append(0)
for t in ans:
print(t,end=" ")
```
Yes
| 58,842
|
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
IA has so many colorful magnets on her fridge! Exactly one letter is written on each magnet, 'a' or 'b'. She loves to play with them, placing all magnets in a row. However, the girl is quickly bored and usually thinks how to make her entertainment more interesting.
Today, when IA looked at the fridge, she noticed that the word formed by magnets is really messy. "It would look much better when I'll swap some of them!" — thought the girl — "but how to do it?". After a while, she got an idea. IA will look at all prefixes with lengths from 1 to the length of the word and for each prefix she will either reverse this prefix or leave it as it is. She will consider the prefixes in the fixed order: from the shortest to the largest. She wants to get the lexicographically smallest possible word after she considers all prefixes. Can you help her, telling which prefixes should be chosen for reversing?
A string a is lexicographically smaller than a string b if and only if one of the following holds:
* a is a prefix of b, but a ≠ b;
* in the first position where a and b differ, the string a has a letter that appears earlier in the alphabet than the corresponding letter in b.
Input
The first and the only line contains a string s (1 ≤ |s| ≤ 1000), describing the initial string formed by magnets. The string s consists only of characters 'a' and 'b'.
Output
Output exactly |s| integers. If IA should reverse the i-th prefix (that is, the substring from 1 to i), the i-th integer should be equal to 1, and it should be equal to 0 otherwise.
If there are multiple possible sequences leading to the optimal answer, print any of them.
Examples
Input
bbab
Output
0 1 1 0
Input
aaaaa
Output
1 0 0 0 1
Note
In the first example, IA can reverse the second and the third prefix and get a string "abbb". She cannot get better result, since it is also lexicographically smallest string obtainable by permuting characters of the initial string.
In the second example, she can reverse any subset of prefixes — all letters are 'a'.
Submitted Solution:
```
#codeforces_1043C
gi = lambda : list(map(int,input().split()))
s = input()
n = len(s)
ans = [0 for e in range(n)]
k = 1
while k < n:
if s[k] == 'a':
temp = k
while k < n and s[k] == 'a':k+=1
ans[temp-1] = ans[k-1] = 1
k += 1
print(*ans)
```
Yes
| 58,843
|
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
IA has so many colorful magnets on her fridge! Exactly one letter is written on each magnet, 'a' or 'b'. She loves to play with them, placing all magnets in a row. However, the girl is quickly bored and usually thinks how to make her entertainment more interesting.
Today, when IA looked at the fridge, she noticed that the word formed by magnets is really messy. "It would look much better when I'll swap some of them!" — thought the girl — "but how to do it?". After a while, she got an idea. IA will look at all prefixes with lengths from 1 to the length of the word and for each prefix she will either reverse this prefix or leave it as it is. She will consider the prefixes in the fixed order: from the shortest to the largest. She wants to get the lexicographically smallest possible word after she considers all prefixes. Can you help her, telling which prefixes should be chosen for reversing?
A string a is lexicographically smaller than a string b if and only if one of the following holds:
* a is a prefix of b, but a ≠ b;
* in the first position where a and b differ, the string a has a letter that appears earlier in the alphabet than the corresponding letter in b.
Input
The first and the only line contains a string s (1 ≤ |s| ≤ 1000), describing the initial string formed by magnets. The string s consists only of characters 'a' and 'b'.
Output
Output exactly |s| integers. If IA should reverse the i-th prefix (that is, the substring from 1 to i), the i-th integer should be equal to 1, and it should be equal to 0 otherwise.
If there are multiple possible sequences leading to the optimal answer, print any of them.
Examples
Input
bbab
Output
0 1 1 0
Input
aaaaa
Output
1 0 0 0 1
Note
In the first example, IA can reverse the second and the third prefix and get a string "abbb". She cannot get better result, since it is also lexicographically smallest string obtainable by permuting characters of the initial string.
In the second example, she can reverse any subset of prefixes — all letters are 'a'.
Submitted Solution:
```
from sys import maxsize, stdout, stdin,stderr
mod = int(1e9 + 7)
def I(): return int(stdin.readline())
def lint(): return [int(x) for x in stdin.readline().split()]
def S(): return input().strip()
def grid(r, c): return [lint() for i in range(r)]
from collections import defaultdict, Counter
import math
import heapq
from heapq import heappop , heappush
import bisect
from itertools import groupby
def gcd(a,b):
while b:
a %= b
tmp = a
a = b
b = tmp
return a
def lcm(a,b):
return a / gcd(a, b) * b
def check_prime(n):
for i in range(2, int(n ** (1 / 2)) + 1):
if not n % i:
return False
return True
def Bs(a, x):
i=0
j=0
left = 0
right = len(a)
flag=False
while left<right:
mi = (left+right)//2
#print(smi,a[mi],x)
if a[mi]<=x:
left = mi+1
i+=1
else:
right = mi
j+=1
#print(left,right,"----")
#print(i-1,j)
if left>0 and a[left-1]==x:
return i-1, j
else:
return -1, -1
s = input()
n = len(s)
ar=[0]*n
a=0
for i in range(1,n):
if s[i]=='a':
if i==n-1:
ar[i]=1
elif s[i+1]!='a':
if a==0:
ar[i-1]=1
ar[i]=1
a=0
else:
a+=1
print(*ar)
```
No
| 58,844
|
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
IA has so many colorful magnets on her fridge! Exactly one letter is written on each magnet, 'a' or 'b'. She loves to play with them, placing all magnets in a row. However, the girl is quickly bored and usually thinks how to make her entertainment more interesting.
Today, when IA looked at the fridge, she noticed that the word formed by magnets is really messy. "It would look much better when I'll swap some of them!" — thought the girl — "but how to do it?". After a while, she got an idea. IA will look at all prefixes with lengths from 1 to the length of the word and for each prefix she will either reverse this prefix or leave it as it is. She will consider the prefixes in the fixed order: from the shortest to the largest. She wants to get the lexicographically smallest possible word after she considers all prefixes. Can you help her, telling which prefixes should be chosen for reversing?
A string a is lexicographically smaller than a string b if and only if one of the following holds:
* a is a prefix of b, but a ≠ b;
* in the first position where a and b differ, the string a has a letter that appears earlier in the alphabet than the corresponding letter in b.
Input
The first and the only line contains a string s (1 ≤ |s| ≤ 1000), describing the initial string formed by magnets. The string s consists only of characters 'a' and 'b'.
Output
Output exactly |s| integers. If IA should reverse the i-th prefix (that is, the substring from 1 to i), the i-th integer should be equal to 1, and it should be equal to 0 otherwise.
If there are multiple possible sequences leading to the optimal answer, print any of them.
Examples
Input
bbab
Output
0 1 1 0
Input
aaaaa
Output
1 0 0 0 1
Note
In the first example, IA can reverse the second and the third prefix and get a string "abbb". She cannot get better result, since it is also lexicographically smallest string obtainable by permuting characters of the initial string.
In the second example, she can reverse any subset of prefixes — all letters are 'a'.
Submitted Solution:
```
#########################################################################################################\
#########################################################################################################
###################################The_Apurv_Rathore#####################################################
#########################################################################################################
#########################################################################################################
import sys,os,io
from sys import stdin
from math import log, gcd, ceil
from collections import defaultdict, deque, Counter
from heapq import heappush, heappop, heapify
from bisect import bisect_left , bisect_right
import math
alphabets = list('abcdefghijklmnopqrstuvwxyz')
#for deep recursion__________________________________________-
from types import GeneratorType
def bootstrap(f, stack=[]):
def wrappedfunc(*args, **kwargs):
if stack:
return f(*args, **kwargs)
else:
to = f(*args, **kwargs)
while True:
if type(to) is GeneratorType:
stack.append(to)
to = next(to)
else:
stack.pop()
if not stack:
break
to = stack[-1].send(to)
return to
return wrappedfunc
def ncr(n, r, p):
num = den = 1
for i in range(r):
num = (num * (n - i)) % p
den = (den * (i + 1)) % p
return (num * pow(den,p - 2, p)) % p
def primeFactors(n):
l = []
while n % 2 == 0:
l.append(2)
n = n / 2
for i in range(3,int(math.sqrt(n))+1,2):
while n % i== 0:
l.append(int(i))
n = n / i
if n > 2:
l.append(n)
c = dict(Counter(l))
return list(set(l))
# return c
def power(x, y, p) :
res = 1
x = x % p
if (x == 0) :
return 0
while (y > 0) :
if ((y & 1) == 1) :
res = (res * x) % p
y = y >> 1 # y = y/2
x = (x * x) % p
return res
#____________________GetPrimeFactors in log(n)________________________________________
def sieveForSmallestPrimeFactor():
MAXN = 100001
spf = [0 for i in range(MAXN)]
spf[1] = 1
for i in range(2, MAXN):
spf[i] = i
for i in range(4, MAXN, 2):
spf[i] = 2
for i in range(3, math.ceil(math.sqrt(MAXN))):
if (spf[i] == i):
for j in range(i * i, MAXN, i):
if (spf[j] == j):
spf[j] = i
return spf
def getPrimeFactorizationLOGN(x):
spf = sieveForSmallestPrimeFactor()
ret = list()
while (x != 1):
ret.append(spf[x])
x = x // spf[x]
return ret
#____________________________________________________________
def SieveOfEratosthenes(n):
#time complexity = nlog(log(n))
prime = [True for i in range(n+1)]
p = 2
while (p * p <= n):
if (prime[p] == True):
for i in range(p * p, n+1, p):
prime[i] = False
p += 1
return prime
def si():
return input()
def divideCeil(n,x):
if (n%x==0):
return n//x
return n//x+1
def ii():
return int(input())
def li():
return list(map(int,input().split()))
#__________________________TEMPLATE__________________OVER_______________________________________________________
if(os.path.exists('input.txt')):
sys.stdin = open("input.txt","r") ; sys.stdout = open("output.txt","w")
# else:
# input = io.BytesIO(os.read(0, os.fstat(0).st_size)).readline
def solve():
s = list(si())
ans = [0]*(len(s))
for i in range(len(s)):
s1 = s[:i][::-1]+s[i+1:]
if s1<s:
s = s1[:]
ans[i]=1
print(*ans)
t = 1
# t = ii()
for _ in range(t):
solve()
```
No
| 58,845
|
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
IA has so many colorful magnets on her fridge! Exactly one letter is written on each magnet, 'a' or 'b'. She loves to play with them, placing all magnets in a row. However, the girl is quickly bored and usually thinks how to make her entertainment more interesting.
Today, when IA looked at the fridge, she noticed that the word formed by magnets is really messy. "It would look much better when I'll swap some of them!" — thought the girl — "but how to do it?". After a while, she got an idea. IA will look at all prefixes with lengths from 1 to the length of the word and for each prefix she will either reverse this prefix or leave it as it is. She will consider the prefixes in the fixed order: from the shortest to the largest. She wants to get the lexicographically smallest possible word after she considers all prefixes. Can you help her, telling which prefixes should be chosen for reversing?
A string a is lexicographically smaller than a string b if and only if one of the following holds:
* a is a prefix of b, but a ≠ b;
* in the first position where a and b differ, the string a has a letter that appears earlier in the alphabet than the corresponding letter in b.
Input
The first and the only line contains a string s (1 ≤ |s| ≤ 1000), describing the initial string formed by magnets. The string s consists only of characters 'a' and 'b'.
Output
Output exactly |s| integers. If IA should reverse the i-th prefix (that is, the substring from 1 to i), the i-th integer should be equal to 1, and it should be equal to 0 otherwise.
If there are multiple possible sequences leading to the optimal answer, print any of them.
Examples
Input
bbab
Output
0 1 1 0
Input
aaaaa
Output
1 0 0 0 1
Note
In the first example, IA can reverse the second and the third prefix and get a string "abbb". She cannot get better result, since it is also lexicographically smallest string obtainable by permuting characters of the initial string.
In the second example, she can reverse any subset of prefixes — all letters are 'a'.
Submitted Solution:
```
s = input()
arr = [0 for _ in range(len(s))]
for i in range(len(s)):
# act = s[:i+1]
# k = len(act)
# a_left = act[:k//2].count('a')
# a_right = act[k//2:].count('a')
# print(act, act[:k//2], act[k//2 + 1:])
if ''.join(reversed(s[:i + 1])) + s[i+1:] <= s:
s = ''.join(reversed(s[:i + 1])) + s[i+1:]
arr[i] = 1
print(*arr)
```
No
| 58,846
|
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
IA has so many colorful magnets on her fridge! Exactly one letter is written on each magnet, 'a' or 'b'. She loves to play with them, placing all magnets in a row. However, the girl is quickly bored and usually thinks how to make her entertainment more interesting.
Today, when IA looked at the fridge, she noticed that the word formed by magnets is really messy. "It would look much better when I'll swap some of them!" — thought the girl — "but how to do it?". After a while, she got an idea. IA will look at all prefixes with lengths from 1 to the length of the word and for each prefix she will either reverse this prefix or leave it as it is. She will consider the prefixes in the fixed order: from the shortest to the largest. She wants to get the lexicographically smallest possible word after she considers all prefixes. Can you help her, telling which prefixes should be chosen for reversing?
A string a is lexicographically smaller than a string b if and only if one of the following holds:
* a is a prefix of b, but a ≠ b;
* in the first position where a and b differ, the string a has a letter that appears earlier in the alphabet than the corresponding letter in b.
Input
The first and the only line contains a string s (1 ≤ |s| ≤ 1000), describing the initial string formed by magnets. The string s consists only of characters 'a' and 'b'.
Output
Output exactly |s| integers. If IA should reverse the i-th prefix (that is, the substring from 1 to i), the i-th integer should be equal to 1, and it should be equal to 0 otherwise.
If there are multiple possible sequences leading to the optimal answer, print any of them.
Examples
Input
bbab
Output
0 1 1 0
Input
aaaaa
Output
1 0 0 0 1
Note
In the first example, IA can reverse the second and the third prefix and get a string "abbb". She cannot get better result, since it is also lexicographically smallest string obtainable by permuting characters of the initial string.
In the second example, she can reverse any subset of prefixes — all letters are 'a'.
Submitted Solution:
```
s=input()
n=len(s)
ans=[0]*n
for i in range(n-1,0,-1):
s1=s[0:n+1]
#print(s1)
if i==n-1 and s1[::-1]<s:
ans[i]=1
#print(s,s1[::-1])
s=s1[::-1]
elif s1[:i+1][::-1]+s1[i+1:]<s:
ans[i]=1
s=s1[:i+1][::-1]+s1[i+1:]
#print(s)
print(*ans)
```
No
| 58,847
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Vasya is developing his own programming language VPL (Vasya Programming Language). Right now he is busy making the system of exceptions. He thinks that the system of exceptions must function like that.
The exceptions are processed by try-catch-blocks. There are two operators that work with the blocks:
1. The try operator. It opens a new try-catch-block.
2. The catch(<exception_type>, <message>) operator. It closes the try-catch-block that was started last and haven't yet been closed. This block can be activated only via exception of type <exception_type>. When we activate this block, the screen displays the <message>. If at the given moment there is no open try-catch-block, then we can't use the catch operator.
The exceptions can occur in the program in only one case: when we use the throw operator. The throw(<exception_type>) operator creates the exception of the given type.
Let's suggest that as a result of using some throw operator the program created an exception of type a. In this case a try-catch-block is activated, such that this block's try operator was described in the program earlier than the used throw operator. Also, this block's catch operator was given an exception type a as a parameter and this block's catch operator is described later that the used throw operator. If there are several such try-catch-blocks, then the system activates the block whose catch operator occurs earlier than others. If no try-catch-block was activated, then the screen displays message "Unhandled Exception".
To test the system, Vasya wrote a program that contains only try, catch and throw operators, one line contains no more than one operator, the whole program contains exactly one throw operator.
Your task is: given a program in VPL, determine, what message will be displayed on the screen.
Input
The first line contains a single integer: n (1 ≤ n ≤ 105) the number of lines in the program. Next n lines contain the program in language VPL. Each line contains no more than one operator. It means that input file can contain empty lines and lines, consisting only of spaces.
The program contains only operators try, catch and throw. It is guaranteed that the program is correct. It means that each started try-catch-block was closed, the catch operators aren't used unless there is an open try-catch-block. The program has exactly one throw operator. The program may have spaces at the beginning of a line, at the end of a line, before and after a bracket, a comma or a quote mark.
The exception type is a nonempty string, that consists only of upper and lower case english letters. The length of the string does not exceed 20 symbols. Message is a nonempty string, that consists only of upper and lower case english letters, digits and spaces. Message is surrounded with quote marks. Quote marks shouldn't be printed. The length of the string does not exceed 20 symbols.
Length of any line in the input file does not exceed 50 symbols.
Output
Print the message the screen will show after the given program is executed.
Examples
Input
8
try
try
throw ( AE )
catch ( BE, "BE in line 3")
try
catch(AE, "AE in line 5")
catch(AE,"AE somewhere")
Output
AE somewhere
Input
8
try
try
throw ( AE )
catch ( AE, "AE in line 3")
try
catch(BE, "BE in line 5")
catch(AE,"AE somewhere")
Output
AE in line 3
Input
8
try
try
throw ( CE )
catch ( BE, "BE in line 3")
try
catch(AE, "AE in line 5")
catch(AE,"AE somewhere")
Output
Unhandled Exception
Note
In the first sample there are 2 try-catch-blocks such that try operator is described earlier than throw operator and catch operator is described later than throw operator: try-catch(BE,"BE in line 3") and try-catch(AE,"AE somewhere"). Exception type is AE, so the second block will be activated, because operator catch(AE,"AE somewhere") has exception type AE as parameter and operator catch(BE,"BE in line 3") has exception type BE.
In the second sample there are 2 try-catch-blocks such that try operator is described earlier than throw operator and catch operator is described later than throw operator: try-catch(AE,"AE in line 3") and try-catch(AE,"AE somewhere"). Exception type is AE, so both blocks can be activated, but only the first one will be activated, because operator catch(AE,"AE in line 3") is described earlier than catch(AE,"AE somewhere")
In the third sample there is no blocks that can be activated by an exception of type CE.
Tags: expression parsing, implementation
Correct Solution:
```
import re
n = int(input())
message = "Unhandled Exception"
S = []
throw_ind = -1
throw_symb = None
found = False
for i in range(n):
line = input().strip()
if len(line) > 0:
if line[:2] == 'tr':
S.append(i)
elif line[:2] == 'ca':
if throw_ind != -1 and not found and S[-1] < throw_ind:
tokens = list(map(str.strip, re.split('\(|\)|,', line)))
#tokens = line.split('(').split(')').split(',')
#tokens = line.split('(')
if tokens[1] == throw_symb:
message = eval(tokens[2])
found = True
S.pop()
elif line[:2] == 'th':
line.replace(' ', '')
throw_ind = i
#throw_symb = line.split('(').split(')')[1]
throw_symb = re.split('\(|\)', line)[1].strip()
print(message)
```
| 59,111
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Vasya is developing his own programming language VPL (Vasya Programming Language). Right now he is busy making the system of exceptions. He thinks that the system of exceptions must function like that.
The exceptions are processed by try-catch-blocks. There are two operators that work with the blocks:
1. The try operator. It opens a new try-catch-block.
2. The catch(<exception_type>, <message>) operator. It closes the try-catch-block that was started last and haven't yet been closed. This block can be activated only via exception of type <exception_type>. When we activate this block, the screen displays the <message>. If at the given moment there is no open try-catch-block, then we can't use the catch operator.
The exceptions can occur in the program in only one case: when we use the throw operator. The throw(<exception_type>) operator creates the exception of the given type.
Let's suggest that as a result of using some throw operator the program created an exception of type a. In this case a try-catch-block is activated, such that this block's try operator was described in the program earlier than the used throw operator. Also, this block's catch operator was given an exception type a as a parameter and this block's catch operator is described later that the used throw operator. If there are several such try-catch-blocks, then the system activates the block whose catch operator occurs earlier than others. If no try-catch-block was activated, then the screen displays message "Unhandled Exception".
To test the system, Vasya wrote a program that contains only try, catch and throw operators, one line contains no more than one operator, the whole program contains exactly one throw operator.
Your task is: given a program in VPL, determine, what message will be displayed on the screen.
Input
The first line contains a single integer: n (1 ≤ n ≤ 105) the number of lines in the program. Next n lines contain the program in language VPL. Each line contains no more than one operator. It means that input file can contain empty lines and lines, consisting only of spaces.
The program contains only operators try, catch and throw. It is guaranteed that the program is correct. It means that each started try-catch-block was closed, the catch operators aren't used unless there is an open try-catch-block. The program has exactly one throw operator. The program may have spaces at the beginning of a line, at the end of a line, before and after a bracket, a comma or a quote mark.
The exception type is a nonempty string, that consists only of upper and lower case english letters. The length of the string does not exceed 20 symbols. Message is a nonempty string, that consists only of upper and lower case english letters, digits and spaces. Message is surrounded with quote marks. Quote marks shouldn't be printed. The length of the string does not exceed 20 symbols.
Length of any line in the input file does not exceed 50 symbols.
Output
Print the message the screen will show after the given program is executed.
Examples
Input
8
try
try
throw ( AE )
catch ( BE, "BE in line 3")
try
catch(AE, "AE in line 5")
catch(AE,"AE somewhere")
Output
AE somewhere
Input
8
try
try
throw ( AE )
catch ( AE, "AE in line 3")
try
catch(BE, "BE in line 5")
catch(AE,"AE somewhere")
Output
AE in line 3
Input
8
try
try
throw ( CE )
catch ( BE, "BE in line 3")
try
catch(AE, "AE in line 5")
catch(AE,"AE somewhere")
Output
Unhandled Exception
Note
In the first sample there are 2 try-catch-blocks such that try operator is described earlier than throw operator and catch operator is described later than throw operator: try-catch(BE,"BE in line 3") and try-catch(AE,"AE somewhere"). Exception type is AE, so the second block will be activated, because operator catch(AE,"AE somewhere") has exception type AE as parameter and operator catch(BE,"BE in line 3") has exception type BE.
In the second sample there are 2 try-catch-blocks such that try operator is described earlier than throw operator and catch operator is described later than throw operator: try-catch(AE,"AE in line 3") and try-catch(AE,"AE somewhere"). Exception type is AE, so both blocks can be activated, but only the first one will be activated, because operator catch(AE,"AE in line 3") is described earlier than catch(AE,"AE somewhere")
In the third sample there is no blocks that can be activated by an exception of type CE.
Tags: expression parsing, implementation
Correct Solution:
```
opened, catched, typ = 0, -1, ''
n = int(input())
arr = list(input().strip() for _ in range(n))
for s in arr:
if s == '':
continue
if s.startswith('try'):
opened += 1
elif s.startswith('throw'):
catched = opened
typ = s[5:].strip()[1:-1].strip()
elif s.startswith('catch'):
if catched == opened:
e, m, _ = s[5:].strip()[1:-1].strip().split('\"')
e, _ = e.split(',')
e = e.strip()
if e == typ:
print(m)
break
catched -= 1
opened -= 1
else:
print("Unhandled Exception")
```
| 59,112
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Vasya is developing his own programming language VPL (Vasya Programming Language). Right now he is busy making the system of exceptions. He thinks that the system of exceptions must function like that.
The exceptions are processed by try-catch-blocks. There are two operators that work with the blocks:
1. The try operator. It opens a new try-catch-block.
2. The catch(<exception_type>, <message>) operator. It closes the try-catch-block that was started last and haven't yet been closed. This block can be activated only via exception of type <exception_type>. When we activate this block, the screen displays the <message>. If at the given moment there is no open try-catch-block, then we can't use the catch operator.
The exceptions can occur in the program in only one case: when we use the throw operator. The throw(<exception_type>) operator creates the exception of the given type.
Let's suggest that as a result of using some throw operator the program created an exception of type a. In this case a try-catch-block is activated, such that this block's try operator was described in the program earlier than the used throw operator. Also, this block's catch operator was given an exception type a as a parameter and this block's catch operator is described later that the used throw operator. If there are several such try-catch-blocks, then the system activates the block whose catch operator occurs earlier than others. If no try-catch-block was activated, then the screen displays message "Unhandled Exception".
To test the system, Vasya wrote a program that contains only try, catch and throw operators, one line contains no more than one operator, the whole program contains exactly one throw operator.
Your task is: given a program in VPL, determine, what message will be displayed on the screen.
Input
The first line contains a single integer: n (1 ≤ n ≤ 105) the number of lines in the program. Next n lines contain the program in language VPL. Each line contains no more than one operator. It means that input file can contain empty lines and lines, consisting only of spaces.
The program contains only operators try, catch and throw. It is guaranteed that the program is correct. It means that each started try-catch-block was closed, the catch operators aren't used unless there is an open try-catch-block. The program has exactly one throw operator. The program may have spaces at the beginning of a line, at the end of a line, before and after a bracket, a comma or a quote mark.
The exception type is a nonempty string, that consists only of upper and lower case english letters. The length of the string does not exceed 20 symbols. Message is a nonempty string, that consists only of upper and lower case english letters, digits and spaces. Message is surrounded with quote marks. Quote marks shouldn't be printed. The length of the string does not exceed 20 symbols.
Length of any line in the input file does not exceed 50 symbols.
Output
Print the message the screen will show after the given program is executed.
Examples
Input
8
try
try
throw ( AE )
catch ( BE, "BE in line 3")
try
catch(AE, "AE in line 5")
catch(AE,"AE somewhere")
Output
AE somewhere
Input
8
try
try
throw ( AE )
catch ( AE, "AE in line 3")
try
catch(BE, "BE in line 5")
catch(AE,"AE somewhere")
Output
AE in line 3
Input
8
try
try
throw ( CE )
catch ( BE, "BE in line 3")
try
catch(AE, "AE in line 5")
catch(AE,"AE somewhere")
Output
Unhandled Exception
Note
In the first sample there are 2 try-catch-blocks such that try operator is described earlier than throw operator and catch operator is described later than throw operator: try-catch(BE,"BE in line 3") and try-catch(AE,"AE somewhere"). Exception type is AE, so the second block will be activated, because operator catch(AE,"AE somewhere") has exception type AE as parameter and operator catch(BE,"BE in line 3") has exception type BE.
In the second sample there are 2 try-catch-blocks such that try operator is described earlier than throw operator and catch operator is described later than throw operator: try-catch(AE,"AE in line 3") and try-catch(AE,"AE somewhere"). Exception type is AE, so both blocks can be activated, but only the first one will be activated, because operator catch(AE,"AE in line 3") is described earlier than catch(AE,"AE somewhere")
In the third sample there is no blocks that can be activated by an exception of type CE.
Tags: expression parsing, implementation
Correct Solution:
```
'''input
3
try
throw ( try )
catch ( try, "try again")
'''
# A coding delight
from sys import stdin
def get_ans(org):
temp = org.split('"')
return temp[1]
def get_sign(arr):
arr = arr.split()
arr = ''.join(arr)
arr = arr.split('(')
first = arr[1].split(')')
return first[0]
# main starts
n = int(stdin.readline().strip())
stack = []
stack2 = []
sign = -1
ans = -1
for _ in range(n):
arr = stdin.readline().strip()
# print(arr)
org = arr[:]
# print(stack, stack2, sign)
if sign == -1:
if 'try' in arr and 'catch' not in arr and 'throw' not in arr:
stack.append(1)
elif 'catch' in arr and arr.find('catch') < arr.find('throw'):
stack.pop()
elif 'throw' in arr:
sign = get_sign(arr)
else:
if 'try' in arr and 'catch' not in arr and 'throw' not in arr:
stack2.append(1)
elif 'catch' in arr:
if len(stack2) == 0:
if sign in arr:
ans = get_ans(org)
break
else:
stack.pop()
else:
stack2.pop()
if ans != -1:
print(ans)
else:
print("Unhandled Exception")
```
| 59,113
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Vasya is developing his own programming language VPL (Vasya Programming Language). Right now he is busy making the system of exceptions. He thinks that the system of exceptions must function like that.
The exceptions are processed by try-catch-blocks. There are two operators that work with the blocks:
1. The try operator. It opens a new try-catch-block.
2. The catch(<exception_type>, <message>) operator. It closes the try-catch-block that was started last and haven't yet been closed. This block can be activated only via exception of type <exception_type>. When we activate this block, the screen displays the <message>. If at the given moment there is no open try-catch-block, then we can't use the catch operator.
The exceptions can occur in the program in only one case: when we use the throw operator. The throw(<exception_type>) operator creates the exception of the given type.
Let's suggest that as a result of using some throw operator the program created an exception of type a. In this case a try-catch-block is activated, such that this block's try operator was described in the program earlier than the used throw operator. Also, this block's catch operator was given an exception type a as a parameter and this block's catch operator is described later that the used throw operator. If there are several such try-catch-blocks, then the system activates the block whose catch operator occurs earlier than others. If no try-catch-block was activated, then the screen displays message "Unhandled Exception".
To test the system, Vasya wrote a program that contains only try, catch and throw operators, one line contains no more than one operator, the whole program contains exactly one throw operator.
Your task is: given a program in VPL, determine, what message will be displayed on the screen.
Input
The first line contains a single integer: n (1 ≤ n ≤ 105) the number of lines in the program. Next n lines contain the program in language VPL. Each line contains no more than one operator. It means that input file can contain empty lines and lines, consisting only of spaces.
The program contains only operators try, catch and throw. It is guaranteed that the program is correct. It means that each started try-catch-block was closed, the catch operators aren't used unless there is an open try-catch-block. The program has exactly one throw operator. The program may have spaces at the beginning of a line, at the end of a line, before and after a bracket, a comma or a quote mark.
The exception type is a nonempty string, that consists only of upper and lower case english letters. The length of the string does not exceed 20 symbols. Message is a nonempty string, that consists only of upper and lower case english letters, digits and spaces. Message is surrounded with quote marks. Quote marks shouldn't be printed. The length of the string does not exceed 20 symbols.
Length of any line in the input file does not exceed 50 symbols.
Output
Print the message the screen will show after the given program is executed.
Examples
Input
8
try
try
throw ( AE )
catch ( BE, "BE in line 3")
try
catch(AE, "AE in line 5")
catch(AE,"AE somewhere")
Output
AE somewhere
Input
8
try
try
throw ( AE )
catch ( AE, "AE in line 3")
try
catch(BE, "BE in line 5")
catch(AE,"AE somewhere")
Output
AE in line 3
Input
8
try
try
throw ( CE )
catch ( BE, "BE in line 3")
try
catch(AE, "AE in line 5")
catch(AE,"AE somewhere")
Output
Unhandled Exception
Note
In the first sample there are 2 try-catch-blocks such that try operator is described earlier than throw operator and catch operator is described later than throw operator: try-catch(BE,"BE in line 3") and try-catch(AE,"AE somewhere"). Exception type is AE, so the second block will be activated, because operator catch(AE,"AE somewhere") has exception type AE as parameter and operator catch(BE,"BE in line 3") has exception type BE.
In the second sample there are 2 try-catch-blocks such that try operator is described earlier than throw operator and catch operator is described later than throw operator: try-catch(AE,"AE in line 3") and try-catch(AE,"AE somewhere"). Exception type is AE, so both blocks can be activated, but only the first one will be activated, because operator catch(AE,"AE in line 3") is described earlier than catch(AE,"AE somewhere")
In the third sample there is no blocks that can be activated by an exception of type CE.
Tags: expression parsing, implementation
Correct Solution:
```
import re
s = []
tid = 0
gl = ""
reg1 = 'throw\s*\(\s*(.*?)\s*\)'
reg2 = 'catch\s*\(\s*(.*?)\s*,\s*"(.*?)"\s*\)'
# print(re.match(reg2, 'catch ( AE ,"asda")'))
def solve():
n = int(input())
gl = ""
for i in range(n):
st = input().strip()
if st == 'try':
s.append(i)
elif st[:2] == 'th':
gl = re.match(reg1, st).group(1)
if len(s) == 0:
tid = -1
else:
tid = s[-1]
elif st[:2] == 'ca':
pat = re.compile(str(reg2))
t = pat.match(st)
if t is not None and gl == t.group(1).strip() and s[-1] <= tid:
print(t.group(2).strip())
return None
s.pop()
print('Unhandled Exception')
if __name__ == "__main__":
solve()
```
| 59,114
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Vasya is developing his own programming language VPL (Vasya Programming Language). Right now he is busy making the system of exceptions. He thinks that the system of exceptions must function like that.
The exceptions are processed by try-catch-blocks. There are two operators that work with the blocks:
1. The try operator. It opens a new try-catch-block.
2. The catch(<exception_type>, <message>) operator. It closes the try-catch-block that was started last and haven't yet been closed. This block can be activated only via exception of type <exception_type>. When we activate this block, the screen displays the <message>. If at the given moment there is no open try-catch-block, then we can't use the catch operator.
The exceptions can occur in the program in only one case: when we use the throw operator. The throw(<exception_type>) operator creates the exception of the given type.
Let's suggest that as a result of using some throw operator the program created an exception of type a. In this case a try-catch-block is activated, such that this block's try operator was described in the program earlier than the used throw operator. Also, this block's catch operator was given an exception type a as a parameter and this block's catch operator is described later that the used throw operator. If there are several such try-catch-blocks, then the system activates the block whose catch operator occurs earlier than others. If no try-catch-block was activated, then the screen displays message "Unhandled Exception".
To test the system, Vasya wrote a program that contains only try, catch and throw operators, one line contains no more than one operator, the whole program contains exactly one throw operator.
Your task is: given a program in VPL, determine, what message will be displayed on the screen.
Input
The first line contains a single integer: n (1 ≤ n ≤ 105) the number of lines in the program. Next n lines contain the program in language VPL. Each line contains no more than one operator. It means that input file can contain empty lines and lines, consisting only of spaces.
The program contains only operators try, catch and throw. It is guaranteed that the program is correct. It means that each started try-catch-block was closed, the catch operators aren't used unless there is an open try-catch-block. The program has exactly one throw operator. The program may have spaces at the beginning of a line, at the end of a line, before and after a bracket, a comma or a quote mark.
The exception type is a nonempty string, that consists only of upper and lower case english letters. The length of the string does not exceed 20 symbols. Message is a nonempty string, that consists only of upper and lower case english letters, digits and spaces. Message is surrounded with quote marks. Quote marks shouldn't be printed. The length of the string does not exceed 20 symbols.
Length of any line in the input file does not exceed 50 symbols.
Output
Print the message the screen will show after the given program is executed.
Examples
Input
8
try
try
throw ( AE )
catch ( BE, "BE in line 3")
try
catch(AE, "AE in line 5")
catch(AE,"AE somewhere")
Output
AE somewhere
Input
8
try
try
throw ( AE )
catch ( AE, "AE in line 3")
try
catch(BE, "BE in line 5")
catch(AE,"AE somewhere")
Output
AE in line 3
Input
8
try
try
throw ( CE )
catch ( BE, "BE in line 3")
try
catch(AE, "AE in line 5")
catch(AE,"AE somewhere")
Output
Unhandled Exception
Note
In the first sample there are 2 try-catch-blocks such that try operator is described earlier than throw operator and catch operator is described later than throw operator: try-catch(BE,"BE in line 3") and try-catch(AE,"AE somewhere"). Exception type is AE, so the second block will be activated, because operator catch(AE,"AE somewhere") has exception type AE as parameter and operator catch(BE,"BE in line 3") has exception type BE.
In the second sample there are 2 try-catch-blocks such that try operator is described earlier than throw operator and catch operator is described later than throw operator: try-catch(AE,"AE in line 3") and try-catch(AE,"AE somewhere"). Exception type is AE, so both blocks can be activated, but only the first one will be activated, because operator catch(AE,"AE in line 3") is described earlier than catch(AE,"AE somewhere")
In the third sample there is no blocks that can be activated by an exception of type CE.
Tags: expression parsing, implementation
Correct Solution:
```
from sys import stdin, stdout
n = int(stdin.readline())
label = ''
cnt = 0
def first(s):
f = ''
for a in s:
if 'z' >= a >= 'a':
f += a
else:
break
return f
for i in range(n):
s = stdin.readline().strip()
if first(s) == 'throw':
label = s[s.index('(') + 1:s.index(')')].strip()
elif first(s) == 'try' and label:
cnt += 1
elif first(s) == 'catch' and cnt:
cnt -= 1
elif first(s) == 'catch' and s[s.index('(') + 1:s.index(',')].strip() == label:
f = s[s.index(',') + 1:s.index(')')].strip()
f = f.strip('"').strip()
stdout.write(f)
break
else:
stdout.write('Unhandled Exception')
```
| 59,115
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Vasya is developing his own programming language VPL (Vasya Programming Language). Right now he is busy making the system of exceptions. He thinks that the system of exceptions must function like that.
The exceptions are processed by try-catch-blocks. There are two operators that work with the blocks:
1. The try operator. It opens a new try-catch-block.
2. The catch(<exception_type>, <message>) operator. It closes the try-catch-block that was started last and haven't yet been closed. This block can be activated only via exception of type <exception_type>. When we activate this block, the screen displays the <message>. If at the given moment there is no open try-catch-block, then we can't use the catch operator.
The exceptions can occur in the program in only one case: when we use the throw operator. The throw(<exception_type>) operator creates the exception of the given type.
Let's suggest that as a result of using some throw operator the program created an exception of type a. In this case a try-catch-block is activated, such that this block's try operator was described in the program earlier than the used throw operator. Also, this block's catch operator was given an exception type a as a parameter and this block's catch operator is described later that the used throw operator. If there are several such try-catch-blocks, then the system activates the block whose catch operator occurs earlier than others. If no try-catch-block was activated, then the screen displays message "Unhandled Exception".
To test the system, Vasya wrote a program that contains only try, catch and throw operators, one line contains no more than one operator, the whole program contains exactly one throw operator.
Your task is: given a program in VPL, determine, what message will be displayed on the screen.
Input
The first line contains a single integer: n (1 ≤ n ≤ 105) the number of lines in the program. Next n lines contain the program in language VPL. Each line contains no more than one operator. It means that input file can contain empty lines and lines, consisting only of spaces.
The program contains only operators try, catch and throw. It is guaranteed that the program is correct. It means that each started try-catch-block was closed, the catch operators aren't used unless there is an open try-catch-block. The program has exactly one throw operator. The program may have spaces at the beginning of a line, at the end of a line, before and after a bracket, a comma or a quote mark.
The exception type is a nonempty string, that consists only of upper and lower case english letters. The length of the string does not exceed 20 symbols. Message is a nonempty string, that consists only of upper and lower case english letters, digits and spaces. Message is surrounded with quote marks. Quote marks shouldn't be printed. The length of the string does not exceed 20 symbols.
Length of any line in the input file does not exceed 50 symbols.
Output
Print the message the screen will show after the given program is executed.
Examples
Input
8
try
try
throw ( AE )
catch ( BE, "BE in line 3")
try
catch(AE, "AE in line 5")
catch(AE,"AE somewhere")
Output
AE somewhere
Input
8
try
try
throw ( AE )
catch ( AE, "AE in line 3")
try
catch(BE, "BE in line 5")
catch(AE,"AE somewhere")
Output
AE in line 3
Input
8
try
try
throw ( CE )
catch ( BE, "BE in line 3")
try
catch(AE, "AE in line 5")
catch(AE,"AE somewhere")
Output
Unhandled Exception
Note
In the first sample there are 2 try-catch-blocks such that try operator is described earlier than throw operator and catch operator is described later than throw operator: try-catch(BE,"BE in line 3") and try-catch(AE,"AE somewhere"). Exception type is AE, so the second block will be activated, because operator catch(AE,"AE somewhere") has exception type AE as parameter and operator catch(BE,"BE in line 3") has exception type BE.
In the second sample there are 2 try-catch-blocks such that try operator is described earlier than throw operator and catch operator is described later than throw operator: try-catch(AE,"AE in line 3") and try-catch(AE,"AE somewhere"). Exception type is AE, so both blocks can be activated, but only the first one will be activated, because operator catch(AE,"AE in line 3") is described earlier than catch(AE,"AE somewhere")
In the third sample there is no blocks that can be activated by an exception of type CE.
Tags: expression parsing, implementation
Correct Solution:
```
import sys
n = int(input())
flag = False
an = ""
queue = []
exc = ""
for x in range(n):
strr = input().split('(');
if strr[0].strip() == 'try':
queue.append(x)
elif strr[0].strip() == 'throw':
exc = strr[1].split(")")[0].strip()
pos = x
elif strr[0].strip() == 'catch':
cat = strr[1].split(",")[0].strip()
if cat == exc and queue[len(queue) - 1] < pos and flag == False:
an = strr[1].split(",")[1]
an = an.split('"')
an = an[1].strip()
flag = True
queue.pop()
if flag == False:
print("Unhandled Exception")
else:
print(an)
```
| 59,116
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Vasya is developing his own programming language VPL (Vasya Programming Language). Right now he is busy making the system of exceptions. He thinks that the system of exceptions must function like that.
The exceptions are processed by try-catch-blocks. There are two operators that work with the blocks:
1. The try operator. It opens a new try-catch-block.
2. The catch(<exception_type>, <message>) operator. It closes the try-catch-block that was started last and haven't yet been closed. This block can be activated only via exception of type <exception_type>. When we activate this block, the screen displays the <message>. If at the given moment there is no open try-catch-block, then we can't use the catch operator.
The exceptions can occur in the program in only one case: when we use the throw operator. The throw(<exception_type>) operator creates the exception of the given type.
Let's suggest that as a result of using some throw operator the program created an exception of type a. In this case a try-catch-block is activated, such that this block's try operator was described in the program earlier than the used throw operator. Also, this block's catch operator was given an exception type a as a parameter and this block's catch operator is described later that the used throw operator. If there are several such try-catch-blocks, then the system activates the block whose catch operator occurs earlier than others. If no try-catch-block was activated, then the screen displays message "Unhandled Exception".
To test the system, Vasya wrote a program that contains only try, catch and throw operators, one line contains no more than one operator, the whole program contains exactly one throw operator.
Your task is: given a program in VPL, determine, what message will be displayed on the screen.
Input
The first line contains a single integer: n (1 ≤ n ≤ 105) the number of lines in the program. Next n lines contain the program in language VPL. Each line contains no more than one operator. It means that input file can contain empty lines and lines, consisting only of spaces.
The program contains only operators try, catch and throw. It is guaranteed that the program is correct. It means that each started try-catch-block was closed, the catch operators aren't used unless there is an open try-catch-block. The program has exactly one throw operator. The program may have spaces at the beginning of a line, at the end of a line, before and after a bracket, a comma or a quote mark.
The exception type is a nonempty string, that consists only of upper and lower case english letters. The length of the string does not exceed 20 symbols. Message is a nonempty string, that consists only of upper and lower case english letters, digits and spaces. Message is surrounded with quote marks. Quote marks shouldn't be printed. The length of the string does not exceed 20 symbols.
Length of any line in the input file does not exceed 50 symbols.
Output
Print the message the screen will show after the given program is executed.
Examples
Input
8
try
try
throw ( AE )
catch ( BE, "BE in line 3")
try
catch(AE, "AE in line 5")
catch(AE,"AE somewhere")
Output
AE somewhere
Input
8
try
try
throw ( AE )
catch ( AE, "AE in line 3")
try
catch(BE, "BE in line 5")
catch(AE,"AE somewhere")
Output
AE in line 3
Input
8
try
try
throw ( CE )
catch ( BE, "BE in line 3")
try
catch(AE, "AE in line 5")
catch(AE,"AE somewhere")
Output
Unhandled Exception
Note
In the first sample there are 2 try-catch-blocks such that try operator is described earlier than throw operator and catch operator is described later than throw operator: try-catch(BE,"BE in line 3") and try-catch(AE,"AE somewhere"). Exception type is AE, so the second block will be activated, because operator catch(AE,"AE somewhere") has exception type AE as parameter and operator catch(BE,"BE in line 3") has exception type BE.
In the second sample there are 2 try-catch-blocks such that try operator is described earlier than throw operator and catch operator is described later than throw operator: try-catch(AE,"AE in line 3") and try-catch(AE,"AE somewhere"). Exception type is AE, so both blocks can be activated, but only the first one will be activated, because operator catch(AE,"AE in line 3") is described earlier than catch(AE,"AE somewhere")
In the third sample there is no blocks that can be activated by an exception of type CE.
Tags: expression parsing, implementation
Correct Solution:
```
#------------------------template--------------------------#
import os
import sys
from math import *
from collections import *
from fractions import *
from bisect import *
from heapq import*
from io import BytesIO, IOBase
def vsInput():
sys.stdin = open('input.txt', 'r')
sys.stdout = open('output.txt', 'w')
BUFSIZE = 8192
class FastIO(IOBase):
newlines = 0
def __init__(self, file):
self._fd = file.fileno()
self.buffer = BytesIO()
self.writable = "x" in file.mode or "r" not in file.mode
self.write = self.buffer.write if self.writable else None
def read(self):
while True:
b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
if not b:
break
ptr = self.buffer.tell()
self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
self.newlines = 0
return self.buffer.read()
def readline(self):
while self.newlines == 0:
b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
self.newlines = b.count(b"\n") + (not b)
ptr = self.buffer.tell()
self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
self.newlines -= 1
return self.buffer.readline()
def flush(self):
if self.writable:
os.write(self._fd, self.buffer.getvalue())
self.buffer.truncate(0), self.buffer.seek(0)
class IOWrapper(IOBase):
def __init__(self, file):
self.buffer = FastIO(file)
self.flush = self.buffer.flush
self.writable = self.buffer.writable
self.write = lambda s: self.buffer.write(s.encode("ascii"))
self.read = lambda: self.buffer.read().decode("ascii")
self.readline = lambda: self.buffer.readline().decode("ascii")
sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)
input = lambda: sys.stdin.readline().rstrip("\r\n")
ALPHA='abcdefghijklmnopqrstuvwxyz'
M=1000000007
def value():return tuple(map(int,input().split()))
def array():return [int(i) for i in input().split()]
def Int():return int(input())
def Str():return input()
def arrayS():return [i for i in input().split()]
#-------------------------code---------------------------#
# vsInput()
n=Int()
stack=[]
id=1
for _ in range(n):
if(stack==[]):
exception=-1
ex_id=-1
s=input().strip()
if(s==''): continue
if(s=='try'):
stack.append(id)
id+=1
elif(s[1]=='h'):
s=s[5:].strip().lstrip('(').rstrip(')').strip()
if(len(stack)!=0):
exception=s
ex_id=stack[-1]
else:
s=s[5:].strip().lstrip('(').rstrip(')').strip()
e,comment=s.split(',')
e=e.strip()
comment=comment.strip()
comment=comment.lstrip('"').rstrip('"')
# print(e,comment)
last_id=stack.pop()
if(last_id<=ex_id and e==exception):
print(comment)
exit()
# print(stack)
# print(s)
print("Unhandled Exception")
```
| 59,117
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Vasya is developing his own programming language VPL (Vasya Programming Language). Right now he is busy making the system of exceptions. He thinks that the system of exceptions must function like that.
The exceptions are processed by try-catch-blocks. There are two operators that work with the blocks:
1. The try operator. It opens a new try-catch-block.
2. The catch(<exception_type>, <message>) operator. It closes the try-catch-block that was started last and haven't yet been closed. This block can be activated only via exception of type <exception_type>. When we activate this block, the screen displays the <message>. If at the given moment there is no open try-catch-block, then we can't use the catch operator.
The exceptions can occur in the program in only one case: when we use the throw operator. The throw(<exception_type>) operator creates the exception of the given type.
Let's suggest that as a result of using some throw operator the program created an exception of type a. In this case a try-catch-block is activated, such that this block's try operator was described in the program earlier than the used throw operator. Also, this block's catch operator was given an exception type a as a parameter and this block's catch operator is described later that the used throw operator. If there are several such try-catch-blocks, then the system activates the block whose catch operator occurs earlier than others. If no try-catch-block was activated, then the screen displays message "Unhandled Exception".
To test the system, Vasya wrote a program that contains only try, catch and throw operators, one line contains no more than one operator, the whole program contains exactly one throw operator.
Your task is: given a program in VPL, determine, what message will be displayed on the screen.
Input
The first line contains a single integer: n (1 ≤ n ≤ 105) the number of lines in the program. Next n lines contain the program in language VPL. Each line contains no more than one operator. It means that input file can contain empty lines and lines, consisting only of spaces.
The program contains only operators try, catch and throw. It is guaranteed that the program is correct. It means that each started try-catch-block was closed, the catch operators aren't used unless there is an open try-catch-block. The program has exactly one throw operator. The program may have spaces at the beginning of a line, at the end of a line, before and after a bracket, a comma or a quote mark.
The exception type is a nonempty string, that consists only of upper and lower case english letters. The length of the string does not exceed 20 symbols. Message is a nonempty string, that consists only of upper and lower case english letters, digits and spaces. Message is surrounded with quote marks. Quote marks shouldn't be printed. The length of the string does not exceed 20 symbols.
Length of any line in the input file does not exceed 50 symbols.
Output
Print the message the screen will show after the given program is executed.
Examples
Input
8
try
try
throw ( AE )
catch ( BE, "BE in line 3")
try
catch(AE, "AE in line 5")
catch(AE,"AE somewhere")
Output
AE somewhere
Input
8
try
try
throw ( AE )
catch ( AE, "AE in line 3")
try
catch(BE, "BE in line 5")
catch(AE,"AE somewhere")
Output
AE in line 3
Input
8
try
try
throw ( CE )
catch ( BE, "BE in line 3")
try
catch(AE, "AE in line 5")
catch(AE,"AE somewhere")
Output
Unhandled Exception
Note
In the first sample there are 2 try-catch-blocks such that try operator is described earlier than throw operator and catch operator is described later than throw operator: try-catch(BE,"BE in line 3") and try-catch(AE,"AE somewhere"). Exception type is AE, so the second block will be activated, because operator catch(AE,"AE somewhere") has exception type AE as parameter and operator catch(BE,"BE in line 3") has exception type BE.
In the second sample there are 2 try-catch-blocks such that try operator is described earlier than throw operator and catch operator is described later than throw operator: try-catch(AE,"AE in line 3") and try-catch(AE,"AE somewhere"). Exception type is AE, so both blocks can be activated, but only the first one will be activated, because operator catch(AE,"AE in line 3") is described earlier than catch(AE,"AE somewhere")
In the third sample there is no blocks that can be activated by an exception of type CE.
Tags: expression parsing, implementation
Correct Solution:
```
import io, os
# input = io.BytesIO(os.read(0, os.fstat(0).st_size)).readline
input = io.StringIO(os.read(0, os.fstat(0).st_size).decode()).readline
ii=lambda:int(input())
kk=lambda:map(int,input().split())
ll=lambda:list(kk())
opened=0
catchd = -1
typ = ""
for _ in range(ii()):
s = input().strip()
if s == "": continue
if s == "try": opened+=1
elif s[0] == 't':
catchd = opened
typ = s[5:-1].strip()[1:].strip()
else:
if catchd == opened:
e,m,_ = s[5:].strip()[1:-1].strip().split("\"")
e,_=e.split(",")
e=e.strip()
if e == typ:
print(m)
exit()
catchd-=1
opened-=1
print("Unhandled Exception")
```
| 59,118
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Your friend Jeff Zebos has been trying to run his new online company, but it's not going very well. He's not getting a lot of sales on his website which he decided to call Azamon. His big problem, you think, is that he's not ranking high enough on the search engines. If only he could rename his products to have better names than his competitors, then he'll be at the top of the search results and will be a millionaire.
After doing some research, you find out that search engines only sort their results lexicographically. If your friend could rename his products to lexicographically smaller strings than his competitor's, then he'll be at the top of the rankings!
To make your strategy less obvious to his competitors, you decide to swap no more than two letters of the product names.
Please help Jeff to find improved names for his products that are lexicographically smaller than his competitor's!
Given the string s representing Jeff's product name and the string c representing his competitor's product name, find a way to swap at most one pair of characters in s (that is, find two distinct indices i and j and swap s_i and s_j) such that the resulting new name becomes strictly lexicographically smaller than c, or determine that it is impossible.
Note: String a is strictly lexicographically smaller than string b if and only if one of the following holds:
* a is a proper prefix of b, that is, a is a prefix of b such that a ≠ b;
* There exists an integer 1 ≤ i ≤ min{(|a|, |b|)} such that a_i < b_i and a_j = b_j for 1 ≤ j < i.
Input
The first line of input contains a single integer t (1 ≤ t ≤ 1500) denoting the number of test cases. The next lines contain descriptions of the test cases.
Each test case consists of a single line containing two space-separated strings s and c (2 ≤ |s| ≤ 5000, 1 ≤ |c| ≤ 5000). The strings s and c consists of uppercase English letters.
It is guaranteed that the sum of |s| in the input is at most 5000 and the sum of the |c| in the input is at most 5000.
Output
For each test case, output a single line containing a single string, which is either
* the new name which is obtained after swapping no more than one pair of characters that is strictly lexicographically smaller than c. In case there are many possible such strings, you can output any of them;
* three dashes (the string "---" without quotes) if it is impossible.
Example
Input
3
AZAMON APPLE
AZAMON AAAAAAAAAAALIBABA
APPLE BANANA
Output
AMAZON
---
APPLE
Note
In the first test case, it is possible to swap the second and the fourth letters of the string and the resulting string "AMAZON" is lexicographically smaller than "APPLE".
It is impossible to improve the product's name in the second test case and satisfy all conditions.
In the third test case, it is possible not to swap a pair of characters. The name "APPLE" is lexicographically smaller than "BANANA". Note that there are other valid answers, e.g., "APPEL".
Tags: greedy
Correct Solution:
```
def swap(lst, i, j):
lst[i], lst[j] = lst[j], lst[i]
def comp(l1, l2):
for i in range(min(len(l1), len(l2))):
if l1[i] < l2[i]:
return True
if l1[i] == l2[i]:
continue
return False
return len(l1) < len(l2)
def logic(s, c):
if comp(s, c):
return s
best = -1
for i in reversed(range(len(s))):
if best == -1 or s[i] < s[best]: best = i
swap(s, i, best)
if comp(s, c):
return s
swap(s, i, best)
return list("---")
t = int(input())
for i in range(t):
s,c = input().split()
s = list(s)
c = list(c)
a = logic(s, c)
print("".join(a))
```
| 59,818
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Your friend Jeff Zebos has been trying to run his new online company, but it's not going very well. He's not getting a lot of sales on his website which he decided to call Azamon. His big problem, you think, is that he's not ranking high enough on the search engines. If only he could rename his products to have better names than his competitors, then he'll be at the top of the search results and will be a millionaire.
After doing some research, you find out that search engines only sort their results lexicographically. If your friend could rename his products to lexicographically smaller strings than his competitor's, then he'll be at the top of the rankings!
To make your strategy less obvious to his competitors, you decide to swap no more than two letters of the product names.
Please help Jeff to find improved names for his products that are lexicographically smaller than his competitor's!
Given the string s representing Jeff's product name and the string c representing his competitor's product name, find a way to swap at most one pair of characters in s (that is, find two distinct indices i and j and swap s_i and s_j) such that the resulting new name becomes strictly lexicographically smaller than c, or determine that it is impossible.
Note: String a is strictly lexicographically smaller than string b if and only if one of the following holds:
* a is a proper prefix of b, that is, a is a prefix of b such that a ≠ b;
* There exists an integer 1 ≤ i ≤ min{(|a|, |b|)} such that a_i < b_i and a_j = b_j for 1 ≤ j < i.
Input
The first line of input contains a single integer t (1 ≤ t ≤ 1500) denoting the number of test cases. The next lines contain descriptions of the test cases.
Each test case consists of a single line containing two space-separated strings s and c (2 ≤ |s| ≤ 5000, 1 ≤ |c| ≤ 5000). The strings s and c consists of uppercase English letters.
It is guaranteed that the sum of |s| in the input is at most 5000 and the sum of the |c| in the input is at most 5000.
Output
For each test case, output a single line containing a single string, which is either
* the new name which is obtained after swapping no more than one pair of characters that is strictly lexicographically smaller than c. In case there are many possible such strings, you can output any of them;
* three dashes (the string "---" without quotes) if it is impossible.
Example
Input
3
AZAMON APPLE
AZAMON AAAAAAAAAAALIBABA
APPLE BANANA
Output
AMAZON
---
APPLE
Note
In the first test case, it is possible to swap the second and the fourth letters of the string and the resulting string "AMAZON" is lexicographically smaller than "APPLE".
It is impossible to improve the product's name in the second test case and satisfy all conditions.
In the third test case, it is possible not to swap a pair of characters. The name "APPLE" is lexicographically smaller than "BANANA". Note that there are other valid answers, e.g., "APPEL".
Tags: greedy
Correct Solution:
```
import collections
T = int(input())
for _ in range(T):
s1, s2 = input().split()
if len(set(s1)) > 1:
arr = list(s1)
cnt = collections.Counter(arr)
i = 0
while i < len(arr) and arr[i] == min(cnt.keys()):
cnt[arr[i]] -= 1
if cnt[arr[i]] == 0:
del cnt[arr[i]]
i += 1
i2 = i
if len(cnt.keys()) != 0:
lo = min(cnt.keys())
while i2 < len(arr):
if arr[i2] == lo:
i3 = i2
i2 += 1
arr[i], arr[i3] = arr[i3], arr[i]
ans = ''.join(arr)
else:
ans = s1
else:
ans = s1
if ans < s2:
print(ans)
else:
print('---')
```
| 59,819
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Your friend Jeff Zebos has been trying to run his new online company, but it's not going very well. He's not getting a lot of sales on his website which he decided to call Azamon. His big problem, you think, is that he's not ranking high enough on the search engines. If only he could rename his products to have better names than his competitors, then he'll be at the top of the search results and will be a millionaire.
After doing some research, you find out that search engines only sort their results lexicographically. If your friend could rename his products to lexicographically smaller strings than his competitor's, then he'll be at the top of the rankings!
To make your strategy less obvious to his competitors, you decide to swap no more than two letters of the product names.
Please help Jeff to find improved names for his products that are lexicographically smaller than his competitor's!
Given the string s representing Jeff's product name and the string c representing his competitor's product name, find a way to swap at most one pair of characters in s (that is, find two distinct indices i and j and swap s_i and s_j) such that the resulting new name becomes strictly lexicographically smaller than c, or determine that it is impossible.
Note: String a is strictly lexicographically smaller than string b if and only if one of the following holds:
* a is a proper prefix of b, that is, a is a prefix of b such that a ≠ b;
* There exists an integer 1 ≤ i ≤ min{(|a|, |b|)} such that a_i < b_i and a_j = b_j for 1 ≤ j < i.
Input
The first line of input contains a single integer t (1 ≤ t ≤ 1500) denoting the number of test cases. The next lines contain descriptions of the test cases.
Each test case consists of a single line containing two space-separated strings s and c (2 ≤ |s| ≤ 5000, 1 ≤ |c| ≤ 5000). The strings s and c consists of uppercase English letters.
It is guaranteed that the sum of |s| in the input is at most 5000 and the sum of the |c| in the input is at most 5000.
Output
For each test case, output a single line containing a single string, which is either
* the new name which is obtained after swapping no more than one pair of characters that is strictly lexicographically smaller than c. In case there are many possible such strings, you can output any of them;
* three dashes (the string "---" without quotes) if it is impossible.
Example
Input
3
AZAMON APPLE
AZAMON AAAAAAAAAAALIBABA
APPLE BANANA
Output
AMAZON
---
APPLE
Note
In the first test case, it is possible to swap the second and the fourth letters of the string and the resulting string "AMAZON" is lexicographically smaller than "APPLE".
It is impossible to improve the product's name in the second test case and satisfy all conditions.
In the third test case, it is possible not to swap a pair of characters. The name "APPLE" is lexicographically smaller than "BANANA". Note that there are other valid answers, e.g., "APPEL".
Tags: greedy
Correct Solution:
```
from sys import stdin,stdout
def main():
T = int(stdin.readline())
for i in range (T):
a = list(map(str,stdin.readline().split()))
newstr = str(a[0])
already = False
possible = False
for j,(x,y) in enumerate(zip(a[0],a[1])):
if x < y:
possible = True
break
if x >= y and already is False:
k = len(a[0]) - 1
while k > j:
if a[0][k] < a[1][j]:
temp = list(newstr)
temp[j],temp[k] = temp[k],temp[j]
newstr = "".join(temp)
already = True
possible = True
break
k -= 1
if already is False and x > y:
k = len(a[0]) - 1
while k > j:
if a[0][k] == a[1][j] and a[0][k]!= a[0][j]:
temp = list(newstr)
temp[j],temp[k] = temp[k],temp[j]
newstr = "".join(temp)
already = True
possible = True
break
k -= 1
if k == j and x > y:
possible = False
break
elif k == j and x == y:
continue
else:
break
if possible is True or already is True:
break
if newstr < a[1]:
stdout.write(newstr+"\n")
else:
stdout.write("---\n")
main()
```
| 59,820
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Your friend Jeff Zebos has been trying to run his new online company, but it's not going very well. He's not getting a lot of sales on his website which he decided to call Azamon. His big problem, you think, is that he's not ranking high enough on the search engines. If only he could rename his products to have better names than his competitors, then he'll be at the top of the search results and will be a millionaire.
After doing some research, you find out that search engines only sort their results lexicographically. If your friend could rename his products to lexicographically smaller strings than his competitor's, then he'll be at the top of the rankings!
To make your strategy less obvious to his competitors, you decide to swap no more than two letters of the product names.
Please help Jeff to find improved names for his products that are lexicographically smaller than his competitor's!
Given the string s representing Jeff's product name and the string c representing his competitor's product name, find a way to swap at most one pair of characters in s (that is, find two distinct indices i and j and swap s_i and s_j) such that the resulting new name becomes strictly lexicographically smaller than c, or determine that it is impossible.
Note: String a is strictly lexicographically smaller than string b if and only if one of the following holds:
* a is a proper prefix of b, that is, a is a prefix of b such that a ≠ b;
* There exists an integer 1 ≤ i ≤ min{(|a|, |b|)} such that a_i < b_i and a_j = b_j for 1 ≤ j < i.
Input
The first line of input contains a single integer t (1 ≤ t ≤ 1500) denoting the number of test cases. The next lines contain descriptions of the test cases.
Each test case consists of a single line containing two space-separated strings s and c (2 ≤ |s| ≤ 5000, 1 ≤ |c| ≤ 5000). The strings s and c consists of uppercase English letters.
It is guaranteed that the sum of |s| in the input is at most 5000 and the sum of the |c| in the input is at most 5000.
Output
For each test case, output a single line containing a single string, which is either
* the new name which is obtained after swapping no more than one pair of characters that is strictly lexicographically smaller than c. In case there are many possible such strings, you can output any of them;
* three dashes (the string "---" without quotes) if it is impossible.
Example
Input
3
AZAMON APPLE
AZAMON AAAAAAAAAAALIBABA
APPLE BANANA
Output
AMAZON
---
APPLE
Note
In the first test case, it is possible to swap the second and the fourth letters of the string and the resulting string "AMAZON" is lexicographically smaller than "APPLE".
It is impossible to improve the product's name in the second test case and satisfy all conditions.
In the third test case, it is possible not to swap a pair of characters. The name "APPLE" is lexicographically smaller than "BANANA". Note that there are other valid answers, e.g., "APPEL".
Tags: greedy
Correct Solution:
```
# def compare(a, b):
# if b.startswith(a) and a != b:
# return True
# else:
# for x, y in zip(a, b):
# if x == y:
# continue
# elif x < y:
# return True
# else:
# return False
def main():
s, c = input().split()
# sl = list(s)
n = len(s)
if s < c:
print(s)
return
# for i in range(len(s)):
# for j in range(len(s)-1, i, -1):
# sn = s[:i] + s[j] + s[i+1:j] + s[i] + s[j+1:]
# if sn < c:
# print(sn)
# return
i = n - 2
j = n - 1
while i > -1:
sn = s[:i] + s[j] + s[i+1:j] + s[i] + s[j+1:]
# Get the next j value by comparing the character
# and then the index in the string.
j = min(i, j, key=lambda x: (s[x], -x))
if sn < c:
print(sn)
return
i -= 1
print('---')
t = int(input())
for _ in range(t):
main()
```
| 59,821
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Your friend Jeff Zebos has been trying to run his new online company, but it's not going very well. He's not getting a lot of sales on his website which he decided to call Azamon. His big problem, you think, is that he's not ranking high enough on the search engines. If only he could rename his products to have better names than his competitors, then he'll be at the top of the search results and will be a millionaire.
After doing some research, you find out that search engines only sort their results lexicographically. If your friend could rename his products to lexicographically smaller strings than his competitor's, then he'll be at the top of the rankings!
To make your strategy less obvious to his competitors, you decide to swap no more than two letters of the product names.
Please help Jeff to find improved names for his products that are lexicographically smaller than his competitor's!
Given the string s representing Jeff's product name and the string c representing his competitor's product name, find a way to swap at most one pair of characters in s (that is, find two distinct indices i and j and swap s_i and s_j) such that the resulting new name becomes strictly lexicographically smaller than c, or determine that it is impossible.
Note: String a is strictly lexicographically smaller than string b if and only if one of the following holds:
* a is a proper prefix of b, that is, a is a prefix of b such that a ≠ b;
* There exists an integer 1 ≤ i ≤ min{(|a|, |b|)} such that a_i < b_i and a_j = b_j for 1 ≤ j < i.
Input
The first line of input contains a single integer t (1 ≤ t ≤ 1500) denoting the number of test cases. The next lines contain descriptions of the test cases.
Each test case consists of a single line containing two space-separated strings s and c (2 ≤ |s| ≤ 5000, 1 ≤ |c| ≤ 5000). The strings s and c consists of uppercase English letters.
It is guaranteed that the sum of |s| in the input is at most 5000 and the sum of the |c| in the input is at most 5000.
Output
For each test case, output a single line containing a single string, which is either
* the new name which is obtained after swapping no more than one pair of characters that is strictly lexicographically smaller than c. In case there are many possible such strings, you can output any of them;
* three dashes (the string "---" without quotes) if it is impossible.
Example
Input
3
AZAMON APPLE
AZAMON AAAAAAAAAAALIBABA
APPLE BANANA
Output
AMAZON
---
APPLE
Note
In the first test case, it is possible to swap the second and the fourth letters of the string and the resulting string "AMAZON" is lexicographically smaller than "APPLE".
It is impossible to improve the product's name in the second test case and satisfy all conditions.
In the third test case, it is possible not to swap a pair of characters. The name "APPLE" is lexicographically smaller than "BANANA". Note that there are other valid answers, e.g., "APPEL".
Tags: greedy
Correct Solution:
```
import sys
p = int(sys.stdin.readline().strip())
ans = []
def findMinimum(lst):
lo = 'a'
for k in range(len(lst)):
if lst[k] <= lo:
lo = lst[k]
idx = k
return lo, idx
for i in range(p):
m, n = sys.stdin.readline().strip().split(' ')
m = list(m)
n = list(n)
objduplicate = m[:]
if m < n:
ans.append(''.join(m))
continue
for p in range(len(m)-1):
lo, idx = findMinimum(m[p+1:])
if lo < m[p]:
m[idx+p+1], m[p] = m[p], m[idx+p+1]
break
if m < n:
ans.append(''.join(m))
else:
ans.append('---')
for i in ans:
sys.stdout.write(i + '\n')
# AVNMRMRNRMRRNNUM
# AMNMRMRNRMRRNNUVA
```
| 59,822
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Your friend Jeff Zebos has been trying to run his new online company, but it's not going very well. He's not getting a lot of sales on his website which he decided to call Azamon. His big problem, you think, is that he's not ranking high enough on the search engines. If only he could rename his products to have better names than his competitors, then he'll be at the top of the search results and will be a millionaire.
After doing some research, you find out that search engines only sort their results lexicographically. If your friend could rename his products to lexicographically smaller strings than his competitor's, then he'll be at the top of the rankings!
To make your strategy less obvious to his competitors, you decide to swap no more than two letters of the product names.
Please help Jeff to find improved names for his products that are lexicographically smaller than his competitor's!
Given the string s representing Jeff's product name and the string c representing his competitor's product name, find a way to swap at most one pair of characters in s (that is, find two distinct indices i and j and swap s_i and s_j) such that the resulting new name becomes strictly lexicographically smaller than c, or determine that it is impossible.
Note: String a is strictly lexicographically smaller than string b if and only if one of the following holds:
* a is a proper prefix of b, that is, a is a prefix of b such that a ≠ b;
* There exists an integer 1 ≤ i ≤ min{(|a|, |b|)} such that a_i < b_i and a_j = b_j for 1 ≤ j < i.
Input
The first line of input contains a single integer t (1 ≤ t ≤ 1500) denoting the number of test cases. The next lines contain descriptions of the test cases.
Each test case consists of a single line containing two space-separated strings s and c (2 ≤ |s| ≤ 5000, 1 ≤ |c| ≤ 5000). The strings s and c consists of uppercase English letters.
It is guaranteed that the sum of |s| in the input is at most 5000 and the sum of the |c| in the input is at most 5000.
Output
For each test case, output a single line containing a single string, which is either
* the new name which is obtained after swapping no more than one pair of characters that is strictly lexicographically smaller than c. In case there are many possible such strings, you can output any of them;
* three dashes (the string "---" without quotes) if it is impossible.
Example
Input
3
AZAMON APPLE
AZAMON AAAAAAAAAAALIBABA
APPLE BANANA
Output
AMAZON
---
APPLE
Note
In the first test case, it is possible to swap the second and the fourth letters of the string and the resulting string "AMAZON" is lexicographically smaller than "APPLE".
It is impossible to improve the product's name in the second test case and satisfy all conditions.
In the third test case, it is possible not to swap a pair of characters. The name "APPLE" is lexicographically smaller than "BANANA". Note that there are other valid answers, e.g., "APPEL".
Tags: greedy
Correct Solution:
```
def swap(s):
l = len(s)
index = list(range(l))
index.sort(key=lambda i:s[i])
low = None
for i in range(l):
ind = index[i]
if s[i] != s[ind]:
left = i
low = s[ind]
break
if low is None:
return
right = 0
for i in range(l):
if s[i] == low:
right = i
s[left], s[right] = s[right],s[left]
def f():
s, c = [list(str) for str in input().split()]
if s < c:
print(''.join(s))
return
swap(s)
if s < c:
print(''.join(s))
else:
print('---')
t = int(input())
for i in range(t):
f()
```
| 59,823
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Your friend Jeff Zebos has been trying to run his new online company, but it's not going very well. He's not getting a lot of sales on his website which he decided to call Azamon. His big problem, you think, is that he's not ranking high enough on the search engines. If only he could rename his products to have better names than his competitors, then he'll be at the top of the search results and will be a millionaire.
After doing some research, you find out that search engines only sort their results lexicographically. If your friend could rename his products to lexicographically smaller strings than his competitor's, then he'll be at the top of the rankings!
To make your strategy less obvious to his competitors, you decide to swap no more than two letters of the product names.
Please help Jeff to find improved names for his products that are lexicographically smaller than his competitor's!
Given the string s representing Jeff's product name and the string c representing his competitor's product name, find a way to swap at most one pair of characters in s (that is, find two distinct indices i and j and swap s_i and s_j) such that the resulting new name becomes strictly lexicographically smaller than c, or determine that it is impossible.
Note: String a is strictly lexicographically smaller than string b if and only if one of the following holds:
* a is a proper prefix of b, that is, a is a prefix of b such that a ≠ b;
* There exists an integer 1 ≤ i ≤ min{(|a|, |b|)} such that a_i < b_i and a_j = b_j for 1 ≤ j < i.
Input
The first line of input contains a single integer t (1 ≤ t ≤ 1500) denoting the number of test cases. The next lines contain descriptions of the test cases.
Each test case consists of a single line containing two space-separated strings s and c (2 ≤ |s| ≤ 5000, 1 ≤ |c| ≤ 5000). The strings s and c consists of uppercase English letters.
It is guaranteed that the sum of |s| in the input is at most 5000 and the sum of the |c| in the input is at most 5000.
Output
For each test case, output a single line containing a single string, which is either
* the new name which is obtained after swapping no more than one pair of characters that is strictly lexicographically smaller than c. In case there are many possible such strings, you can output any of them;
* three dashes (the string "---" without quotes) if it is impossible.
Example
Input
3
AZAMON APPLE
AZAMON AAAAAAAAAAALIBABA
APPLE BANANA
Output
AMAZON
---
APPLE
Note
In the first test case, it is possible to swap the second and the fourth letters of the string and the resulting string "AMAZON" is lexicographically smaller than "APPLE".
It is impossible to improve the product's name in the second test case and satisfy all conditions.
In the third test case, it is possible not to swap a pair of characters. The name "APPLE" is lexicographically smaller than "BANANA". Note that there are other valid answers, e.g., "APPEL".
Tags: greedy
Correct Solution:
```
import sys, queue, copy
sys.setrecursionlimit(10 ** 8)
def inpl(): return list(map(int, sys.stdin.readline().split()))
def inpl_str(): return list(sys.stdin.readline().split())
INF = float('inf')
def solve():
S, c = inpl_str()
s_sort = sorted(S)
for i in range(len(S)):
if S[i] != s_sort[i]:
j = max(j for j,v in enumerate(S[i:],i) if v == s_sort[i])
ans = S[:i] + S[j] + S[i+1:j] + S[i] + S[j+1:]
break
else:
ans = S
if ans >= c :
ans = "---"
print(ans)
q = int(input())
for _ in range(q):
solve()
```
| 59,824
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Your friend Jeff Zebos has been trying to run his new online company, but it's not going very well. He's not getting a lot of sales on his website which he decided to call Azamon. His big problem, you think, is that he's not ranking high enough on the search engines. If only he could rename his products to have better names than his competitors, then he'll be at the top of the search results and will be a millionaire.
After doing some research, you find out that search engines only sort their results lexicographically. If your friend could rename his products to lexicographically smaller strings than his competitor's, then he'll be at the top of the rankings!
To make your strategy less obvious to his competitors, you decide to swap no more than two letters of the product names.
Please help Jeff to find improved names for his products that are lexicographically smaller than his competitor's!
Given the string s representing Jeff's product name and the string c representing his competitor's product name, find a way to swap at most one pair of characters in s (that is, find two distinct indices i and j and swap s_i and s_j) such that the resulting new name becomes strictly lexicographically smaller than c, or determine that it is impossible.
Note: String a is strictly lexicographically smaller than string b if and only if one of the following holds:
* a is a proper prefix of b, that is, a is a prefix of b such that a ≠ b;
* There exists an integer 1 ≤ i ≤ min{(|a|, |b|)} such that a_i < b_i and a_j = b_j for 1 ≤ j < i.
Input
The first line of input contains a single integer t (1 ≤ t ≤ 1500) denoting the number of test cases. The next lines contain descriptions of the test cases.
Each test case consists of a single line containing two space-separated strings s and c (2 ≤ |s| ≤ 5000, 1 ≤ |c| ≤ 5000). The strings s and c consists of uppercase English letters.
It is guaranteed that the sum of |s| in the input is at most 5000 and the sum of the |c| in the input is at most 5000.
Output
For each test case, output a single line containing a single string, which is either
* the new name which is obtained after swapping no more than one pair of characters that is strictly lexicographically smaller than c. In case there are many possible such strings, you can output any of them;
* three dashes (the string "---" without quotes) if it is impossible.
Example
Input
3
AZAMON APPLE
AZAMON AAAAAAAAAAALIBABA
APPLE BANANA
Output
AMAZON
---
APPLE
Note
In the first test case, it is possible to swap the second and the fourth letters of the string and the resulting string "AMAZON" is lexicographically smaller than "APPLE".
It is impossible to improve the product's name in the second test case and satisfy all conditions.
In the third test case, it is possible not to swap a pair of characters. The name "APPLE" is lexicographically smaller than "BANANA". Note that there are other valid answers, e.g., "APPEL".
Tags: greedy
Correct Solution:
```
from sys import stdin
from string import ascii_uppercase as y
for _ in range(int(stdin.readline())):
s,c = stdin.readline().split()
dct = {q:set() for q in y}
fl = 0
for i in range(len(s)):
dct[s[i]].add(i)
dct1 = {'A':set()}
for r in range(1,26):
dct1[y[r]] = dct1[y[r-1]].union(dct[y[r-1]])
for i in range(min(len(s),len(c))):
if fl:break
if s[i]<c[i]:
print(s)
fl = 1
break
elif s[i] == c[i]:
for x in dct1[s[i]]:
if x > i:
print(s[:i]+s[x]+s[i+1:x]+s[i]+s[x+1:])
fl = 1
break
else:
for x in dct1[c[i]]:
if x > i:
print(s[:i]+s[x]+s[i+1:x]+s[i]+s[x+1:])
fl = 1
break
if not fl:
for x in dct[c[i]]:
if x > i:
u = s[:i] + s[x]+ s[i + 1:x] + s[i]+s[x + 1:]
if u < c:
print(u)
fl = 1
break
if not fl:
print('---')
fl = 1
break
if not fl:
if len(s)<len(c):
print(s)
else:
print('---')
```
| 59,825
|
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|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Your friend Jeff Zebos has been trying to run his new online company, but it's not going very well. He's not getting a lot of sales on his website which he decided to call Azamon. His big problem, you think, is that he's not ranking high enough on the search engines. If only he could rename his products to have better names than his competitors, then he'll be at the top of the search results and will be a millionaire.
After doing some research, you find out that search engines only sort their results lexicographically. If your friend could rename his products to lexicographically smaller strings than his competitor's, then he'll be at the top of the rankings!
To make your strategy less obvious to his competitors, you decide to swap no more than two letters of the product names.
Please help Jeff to find improved names for his products that are lexicographically smaller than his competitor's!
Given the string s representing Jeff's product name and the string c representing his competitor's product name, find a way to swap at most one pair of characters in s (that is, find two distinct indices i and j and swap s_i and s_j) such that the resulting new name becomes strictly lexicographically smaller than c, or determine that it is impossible.
Note: String a is strictly lexicographically smaller than string b if and only if one of the following holds:
* a is a proper prefix of b, that is, a is a prefix of b such that a ≠ b;
* There exists an integer 1 ≤ i ≤ min{(|a|, |b|)} such that a_i < b_i and a_j = b_j for 1 ≤ j < i.
Input
The first line of input contains a single integer t (1 ≤ t ≤ 1500) denoting the number of test cases. The next lines contain descriptions of the test cases.
Each test case consists of a single line containing two space-separated strings s and c (2 ≤ |s| ≤ 5000, 1 ≤ |c| ≤ 5000). The strings s and c consists of uppercase English letters.
It is guaranteed that the sum of |s| in the input is at most 5000 and the sum of the |c| in the input is at most 5000.
Output
For each test case, output a single line containing a single string, which is either
* the new name which is obtained after swapping no more than one pair of characters that is strictly lexicographically smaller than c. In case there are many possible such strings, you can output any of them;
* three dashes (the string "---" without quotes) if it is impossible.
Example
Input
3
AZAMON APPLE
AZAMON AAAAAAAAAAALIBABA
APPLE BANANA
Output
AMAZON
---
APPLE
Note
In the first test case, it is possible to swap the second and the fourth letters of the string and the resulting string "AMAZON" is lexicographically smaller than "APPLE".
It is impossible to improve the product's name in the second test case and satisfy all conditions.
In the third test case, it is possible not to swap a pair of characters. The name "APPLE" is lexicographically smaller than "BANANA". Note that there are other valid answers, e.g., "APPEL".
Submitted Solution:
```
#!/usr/bin/env python3
import sys
#lines = stdin.readlines()
def rint():
return map(int, sys.stdin.readline().split())
def input():
return sys.stdin.readline().rstrip('\n')
def oint():
return int(input())
t = oint()
for _ in range(t):
ss = input()
s, c = ss.split()
#print(s)
#print(c)
s = list(s)
c = list(c)
ls = len(s)
lc = len(c)
l = min(ls, lc)
find = 0
for i in range(l):
if ord(s[i]) == ord(c[i]):
for j in range(i+1, ls):
if ord(s[j]) < ord(c[i]):
s[i], s[j] = s[j], s[i]
find = 1
break
elif ord(s[i]) > ord(c[i]):
for j in range(i+1, ls):
if ord(s[j]) < ord(c[i]):
s[i], s[j] = s[j], s[i]
find = 1
break
else:
for j in range(ls-1, i, -1):
if ord(s[j]) == ord(c[i]):
s[i], s[j] = s[j], s[i]
break
else:
find = -1
break
for j in range(i+1, l):
if ord(s[j]) < ord(c[j]):
find = 1
break
elif ord(s[j]) > ord(c[j]):
find = -1
break
if find:
break
if ls < lc:
find = 1
break
else:
find = -1
break
else:
find = 1
break
if find:
break
if find == 0:
if ls < lc:
find = 1
else:
find = -1
if find == 1:
print("".join(s))
else:
print("---")
```
Yes
| 59,826
|
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Your friend Jeff Zebos has been trying to run his new online company, but it's not going very well. He's not getting a lot of sales on his website which he decided to call Azamon. His big problem, you think, is that he's not ranking high enough on the search engines. If only he could rename his products to have better names than his competitors, then he'll be at the top of the search results and will be a millionaire.
After doing some research, you find out that search engines only sort their results lexicographically. If your friend could rename his products to lexicographically smaller strings than his competitor's, then he'll be at the top of the rankings!
To make your strategy less obvious to his competitors, you decide to swap no more than two letters of the product names.
Please help Jeff to find improved names for his products that are lexicographically smaller than his competitor's!
Given the string s representing Jeff's product name and the string c representing his competitor's product name, find a way to swap at most one pair of characters in s (that is, find two distinct indices i and j and swap s_i and s_j) such that the resulting new name becomes strictly lexicographically smaller than c, or determine that it is impossible.
Note: String a is strictly lexicographically smaller than string b if and only if one of the following holds:
* a is a proper prefix of b, that is, a is a prefix of b such that a ≠ b;
* There exists an integer 1 ≤ i ≤ min{(|a|, |b|)} such that a_i < b_i and a_j = b_j for 1 ≤ j < i.
Input
The first line of input contains a single integer t (1 ≤ t ≤ 1500) denoting the number of test cases. The next lines contain descriptions of the test cases.
Each test case consists of a single line containing two space-separated strings s and c (2 ≤ |s| ≤ 5000, 1 ≤ |c| ≤ 5000). The strings s and c consists of uppercase English letters.
It is guaranteed that the sum of |s| in the input is at most 5000 and the sum of the |c| in the input is at most 5000.
Output
For each test case, output a single line containing a single string, which is either
* the new name which is obtained after swapping no more than one pair of characters that is strictly lexicographically smaller than c. In case there are many possible such strings, you can output any of them;
* three dashes (the string "---" without quotes) if it is impossible.
Example
Input
3
AZAMON APPLE
AZAMON AAAAAAAAAAALIBABA
APPLE BANANA
Output
AMAZON
---
APPLE
Note
In the first test case, it is possible to swap the second and the fourth letters of the string and the resulting string "AMAZON" is lexicographically smaller than "APPLE".
It is impossible to improve the product's name in the second test case and satisfy all conditions.
In the third test case, it is possible not to swap a pair of characters. The name "APPLE" is lexicographically smaller than "BANANA". Note that there are other valid answers, e.g., "APPEL".
Submitted Solution:
```
t = int(input())
for _ in range(t):
s1, s2 = input().split();
if s1 < s2:
print(s1)
continue
s3 = sorted(s1)
s1 = list(s1)
x = y = -1
j = 0
for i in range(len(s3)):
if s1[i] == s3[j]:
j += 1
continue
if s1[i] > s3[j]:
x = i
y = j
r = "".join(s1).rfind(s3[j])
s1[i], s1[r] = s1[r], s1[i]
break
s1 = "".join(s1)
if s1 < s2:
print(s1)
else:
print('---')
```
Yes
| 59,827
|
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Your friend Jeff Zebos has been trying to run his new online company, but it's not going very well. He's not getting a lot of sales on his website which he decided to call Azamon. His big problem, you think, is that he's not ranking high enough on the search engines. If only he could rename his products to have better names than his competitors, then he'll be at the top of the search results and will be a millionaire.
After doing some research, you find out that search engines only sort their results lexicographically. If your friend could rename his products to lexicographically smaller strings than his competitor's, then he'll be at the top of the rankings!
To make your strategy less obvious to his competitors, you decide to swap no more than two letters of the product names.
Please help Jeff to find improved names for his products that are lexicographically smaller than his competitor's!
Given the string s representing Jeff's product name and the string c representing his competitor's product name, find a way to swap at most one pair of characters in s (that is, find two distinct indices i and j and swap s_i and s_j) such that the resulting new name becomes strictly lexicographically smaller than c, or determine that it is impossible.
Note: String a is strictly lexicographically smaller than string b if and only if one of the following holds:
* a is a proper prefix of b, that is, a is a prefix of b such that a ≠ b;
* There exists an integer 1 ≤ i ≤ min{(|a|, |b|)} such that a_i < b_i and a_j = b_j for 1 ≤ j < i.
Input
The first line of input contains a single integer t (1 ≤ t ≤ 1500) denoting the number of test cases. The next lines contain descriptions of the test cases.
Each test case consists of a single line containing two space-separated strings s and c (2 ≤ |s| ≤ 5000, 1 ≤ |c| ≤ 5000). The strings s and c consists of uppercase English letters.
It is guaranteed that the sum of |s| in the input is at most 5000 and the sum of the |c| in the input is at most 5000.
Output
For each test case, output a single line containing a single string, which is either
* the new name which is obtained after swapping no more than one pair of characters that is strictly lexicographically smaller than c. In case there are many possible such strings, you can output any of them;
* three dashes (the string "---" without quotes) if it is impossible.
Example
Input
3
AZAMON APPLE
AZAMON AAAAAAAAAAALIBABA
APPLE BANANA
Output
AMAZON
---
APPLE
Note
In the first test case, it is possible to swap the second and the fourth letters of the string and the resulting string "AMAZON" is lexicographically smaller than "APPLE".
It is impossible to improve the product's name in the second test case and satisfy all conditions.
In the third test case, it is possible not to swap a pair of characters. The name "APPLE" is lexicographically smaller than "BANANA". Note that there are other valid answers, e.g., "APPEL".
Submitted Solution:
```
for t in range(int(input())):
s1, s2 = input().split()
if s1 < s2:
print(s1)
continue
found = False
i = 0
for i in range(min(len(s1), len(s2))):
if s2[i] != s1[i]:
found = True
break
flag = False
(mex, index) = (s1[0], 0)
for k in range(1, i + 1):
if s1[k] < s1[k - 1]:
print(s1[:k - 1] + s1[k] + s1[k - 1] + s1[k + 1:])
flag = True
break
elif k < i:
(mex, index) = (s1[k], k)
if not flag:
for j, c in enumerate(s1[i:], start=i):
if c < mex and i != 0:
print(s1[:index] + c + s1[index + 1:j] + mex + s1[j + 1:])
flag = True
break
if c <= s2[i]:
if (c + s1[i + 1:j] + s1[i] + s1[j + 1:]) < s2[i:]:
print(s1[:i] + c + s1[i + 1:j] + s1[i] + s1[j + 1:])
flag = True
break
if not flag:
print('---')
```
Yes
| 59,828
|
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|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Your friend Jeff Zebos has been trying to run his new online company, but it's not going very well. He's not getting a lot of sales on his website which he decided to call Azamon. His big problem, you think, is that he's not ranking high enough on the search engines. If only he could rename his products to have better names than his competitors, then he'll be at the top of the search results and will be a millionaire.
After doing some research, you find out that search engines only sort their results lexicographically. If your friend could rename his products to lexicographically smaller strings than his competitor's, then he'll be at the top of the rankings!
To make your strategy less obvious to his competitors, you decide to swap no more than two letters of the product names.
Please help Jeff to find improved names for his products that are lexicographically smaller than his competitor's!
Given the string s representing Jeff's product name and the string c representing his competitor's product name, find a way to swap at most one pair of characters in s (that is, find two distinct indices i and j and swap s_i and s_j) such that the resulting new name becomes strictly lexicographically smaller than c, or determine that it is impossible.
Note: String a is strictly lexicographically smaller than string b if and only if one of the following holds:
* a is a proper prefix of b, that is, a is a prefix of b such that a ≠ b;
* There exists an integer 1 ≤ i ≤ min{(|a|, |b|)} such that a_i < b_i and a_j = b_j for 1 ≤ j < i.
Input
The first line of input contains a single integer t (1 ≤ t ≤ 1500) denoting the number of test cases. The next lines contain descriptions of the test cases.
Each test case consists of a single line containing two space-separated strings s and c (2 ≤ |s| ≤ 5000, 1 ≤ |c| ≤ 5000). The strings s and c consists of uppercase English letters.
It is guaranteed that the sum of |s| in the input is at most 5000 and the sum of the |c| in the input is at most 5000.
Output
For each test case, output a single line containing a single string, which is either
* the new name which is obtained after swapping no more than one pair of characters that is strictly lexicographically smaller than c. In case there are many possible such strings, you can output any of them;
* three dashes (the string "---" without quotes) if it is impossible.
Example
Input
3
AZAMON APPLE
AZAMON AAAAAAAAAAALIBABA
APPLE BANANA
Output
AMAZON
---
APPLE
Note
In the first test case, it is possible to swap the second and the fourth letters of the string and the resulting string "AMAZON" is lexicographically smaller than "APPLE".
It is impossible to improve the product's name in the second test case and satisfy all conditions.
In the third test case, it is possible not to swap a pair of characters. The name "APPLE" is lexicographically smaller than "BANANA". Note that there are other valid answers, e.g., "APPEL".
Submitted Solution:
```
from sys import stdin
def solve(a,b):
t,s = list(a),"".join(sorted(a))
for i in range(len(a)):
if t[i] != s[i]:
y = a.rindex(s[i])
t[i],t[y] = t[y],t[i]
break
z = "".join(t)
return(z if z<b else "---")
for _ in range(int(stdin.readline())):
s, c = map(str,stdin.readline().split())
print(solve(s,c))
```
Yes
| 59,829
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Your friend Jeff Zebos has been trying to run his new online company, but it's not going very well. He's not getting a lot of sales on his website which he decided to call Azamon. His big problem, you think, is that he's not ranking high enough on the search engines. If only he could rename his products to have better names than his competitors, then he'll be at the top of the search results and will be a millionaire.
After doing some research, you find out that search engines only sort their results lexicographically. If your friend could rename his products to lexicographically smaller strings than his competitor's, then he'll be at the top of the rankings!
To make your strategy less obvious to his competitors, you decide to swap no more than two letters of the product names.
Please help Jeff to find improved names for his products that are lexicographically smaller than his competitor's!
Given the string s representing Jeff's product name and the string c representing his competitor's product name, find a way to swap at most one pair of characters in s (that is, find two distinct indices i and j and swap s_i and s_j) such that the resulting new name becomes strictly lexicographically smaller than c, or determine that it is impossible.
Note: String a is strictly lexicographically smaller than string b if and only if one of the following holds:
* a is a proper prefix of b, that is, a is a prefix of b such that a ≠ b;
* There exists an integer 1 ≤ i ≤ min{(|a|, |b|)} such that a_i < b_i and a_j = b_j for 1 ≤ j < i.
Input
The first line of input contains a single integer t (1 ≤ t ≤ 1500) denoting the number of test cases. The next lines contain descriptions of the test cases.
Each test case consists of a single line containing two space-separated strings s and c (2 ≤ |s| ≤ 5000, 1 ≤ |c| ≤ 5000). The strings s and c consists of uppercase English letters.
It is guaranteed that the sum of |s| in the input is at most 5000 and the sum of the |c| in the input is at most 5000.
Output
For each test case, output a single line containing a single string, which is either
* the new name which is obtained after swapping no more than one pair of characters that is strictly lexicographically smaller than c. In case there are many possible such strings, you can output any of them;
* three dashes (the string "---" without quotes) if it is impossible.
Example
Input
3
AZAMON APPLE
AZAMON AAAAAAAAAAALIBABA
APPLE BANANA
Output
AMAZON
---
APPLE
Note
In the first test case, it is possible to swap the second and the fourth letters of the string and the resulting string "AMAZON" is lexicographically smaller than "APPLE".
It is impossible to improve the product's name in the second test case and satisfy all conditions.
In the third test case, it is possible not to swap a pair of characters. The name "APPLE" is lexicographically smaller than "BANANA". Note that there are other valid answers, e.g., "APPEL".
Submitted Solution:
```
for _ in range(int(input())):
s,c=input().split()
l=min(len(s),len(c))
for i in range(l):
if s[i]!=c[i]:break
if i==l:
if l==len(s):print(s)
else:print('---')
continue
if s[i]<c[i]:print(s);continue
else:
flag=1
for j in range(i,len(s)):
if s[j]<c[i]:
s=list(s)
s[i],s[j]=s[j],s[i]
print(*s,sep='')
flag=0
break
if flag:print('---')
```
No
| 59,830
|
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Your friend Jeff Zebos has been trying to run his new online company, but it's not going very well. He's not getting a lot of sales on his website which he decided to call Azamon. His big problem, you think, is that he's not ranking high enough on the search engines. If only he could rename his products to have better names than his competitors, then he'll be at the top of the search results and will be a millionaire.
After doing some research, you find out that search engines only sort their results lexicographically. If your friend could rename his products to lexicographically smaller strings than his competitor's, then he'll be at the top of the rankings!
To make your strategy less obvious to his competitors, you decide to swap no more than two letters of the product names.
Please help Jeff to find improved names for his products that are lexicographically smaller than his competitor's!
Given the string s representing Jeff's product name and the string c representing his competitor's product name, find a way to swap at most one pair of characters in s (that is, find two distinct indices i and j and swap s_i and s_j) such that the resulting new name becomes strictly lexicographically smaller than c, or determine that it is impossible.
Note: String a is strictly lexicographically smaller than string b if and only if one of the following holds:
* a is a proper prefix of b, that is, a is a prefix of b such that a ≠ b;
* There exists an integer 1 ≤ i ≤ min{(|a|, |b|)} such that a_i < b_i and a_j = b_j for 1 ≤ j < i.
Input
The first line of input contains a single integer t (1 ≤ t ≤ 1500) denoting the number of test cases. The next lines contain descriptions of the test cases.
Each test case consists of a single line containing two space-separated strings s and c (2 ≤ |s| ≤ 5000, 1 ≤ |c| ≤ 5000). The strings s and c consists of uppercase English letters.
It is guaranteed that the sum of |s| in the input is at most 5000 and the sum of the |c| in the input is at most 5000.
Output
For each test case, output a single line containing a single string, which is either
* the new name which is obtained after swapping no more than one pair of characters that is strictly lexicographically smaller than c. In case there are many possible such strings, you can output any of them;
* three dashes (the string "---" without quotes) if it is impossible.
Example
Input
3
AZAMON APPLE
AZAMON AAAAAAAAAAALIBABA
APPLE BANANA
Output
AMAZON
---
APPLE
Note
In the first test case, it is possible to swap the second and the fourth letters of the string and the resulting string "AMAZON" is lexicographically smaller than "APPLE".
It is impossible to improve the product's name in the second test case and satisfy all conditions.
In the third test case, it is possible not to swap a pair of characters. The name "APPLE" is lexicographically smaller than "BANANA". Note that there are other valid answers, e.g., "APPEL".
Submitted Solution:
```
def check(s1,s2):
s = list(s1)
s.sort()
rtn = ''
if s1<s2:
return s1
if ''.join(s) > s2:
return '---'
for i in range (len(s)):
if s1[i] != s[i]:
rtn += s1[:i]
rtn += s[i]
for j in range (i+1,len(s)):
if s1[j]==s[i]:
rtn += s1[i+1:j]
rtn +=s1[i]
rtn += s1[j+1:]
return rtn if rtn<s2 else '---'
for rep in range(int(input())):
print (check(*input().split()))
```
No
| 59,831
|
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Your friend Jeff Zebos has been trying to run his new online company, but it's not going very well. He's not getting a lot of sales on his website which he decided to call Azamon. His big problem, you think, is that he's not ranking high enough on the search engines. If only he could rename his products to have better names than his competitors, then he'll be at the top of the search results and will be a millionaire.
After doing some research, you find out that search engines only sort their results lexicographically. If your friend could rename his products to lexicographically smaller strings than his competitor's, then he'll be at the top of the rankings!
To make your strategy less obvious to his competitors, you decide to swap no more than two letters of the product names.
Please help Jeff to find improved names for his products that are lexicographically smaller than his competitor's!
Given the string s representing Jeff's product name and the string c representing his competitor's product name, find a way to swap at most one pair of characters in s (that is, find two distinct indices i and j and swap s_i and s_j) such that the resulting new name becomes strictly lexicographically smaller than c, or determine that it is impossible.
Note: String a is strictly lexicographically smaller than string b if and only if one of the following holds:
* a is a proper prefix of b, that is, a is a prefix of b such that a ≠ b;
* There exists an integer 1 ≤ i ≤ min{(|a|, |b|)} such that a_i < b_i and a_j = b_j for 1 ≤ j < i.
Input
The first line of input contains a single integer t (1 ≤ t ≤ 1500) denoting the number of test cases. The next lines contain descriptions of the test cases.
Each test case consists of a single line containing two space-separated strings s and c (2 ≤ |s| ≤ 5000, 1 ≤ |c| ≤ 5000). The strings s and c consists of uppercase English letters.
It is guaranteed that the sum of |s| in the input is at most 5000 and the sum of the |c| in the input is at most 5000.
Output
For each test case, output a single line containing a single string, which is either
* the new name which is obtained after swapping no more than one pair of characters that is strictly lexicographically smaller than c. In case there are many possible such strings, you can output any of them;
* three dashes (the string "---" without quotes) if it is impossible.
Example
Input
3
AZAMON APPLE
AZAMON AAAAAAAAAAALIBABA
APPLE BANANA
Output
AMAZON
---
APPLE
Note
In the first test case, it is possible to swap the second and the fourth letters of the string and the resulting string "AMAZON" is lexicographically smaller than "APPLE".
It is impossible to improve the product's name in the second test case and satisfy all conditions.
In the third test case, it is possible not to swap a pair of characters. The name "APPLE" is lexicographically smaller than "BANANA". Note that there are other valid answers, e.g., "APPEL".
Submitted Solution:
```
import sys
input=sys.stdin.readline
t=int(input())
for i in range(t):
a,b=input().split()
a=a.strip()
b=b.strip()
if a<b:
print(a)
continue
n=len(a)
m=len(b)
a=list(a)
f=0
b=list(b)
for i in range(min(n,m)):
if a[i]!=b[i]:
ind=i
break
for j in range(ind,n):
if a[j]<b[i]:
a[j],a[ind]=a[ind],a[j]
f=1
break
if f==0:
print("---")
else:
print(''.join(a))
```
No
| 59,832
|
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Your friend Jeff Zebos has been trying to run his new online company, but it's not going very well. He's not getting a lot of sales on his website which he decided to call Azamon. His big problem, you think, is that he's not ranking high enough on the search engines. If only he could rename his products to have better names than his competitors, then he'll be at the top of the search results and will be a millionaire.
After doing some research, you find out that search engines only sort their results lexicographically. If your friend could rename his products to lexicographically smaller strings than his competitor's, then he'll be at the top of the rankings!
To make your strategy less obvious to his competitors, you decide to swap no more than two letters of the product names.
Please help Jeff to find improved names for his products that are lexicographically smaller than his competitor's!
Given the string s representing Jeff's product name and the string c representing his competitor's product name, find a way to swap at most one pair of characters in s (that is, find two distinct indices i and j and swap s_i and s_j) such that the resulting new name becomes strictly lexicographically smaller than c, or determine that it is impossible.
Note: String a is strictly lexicographically smaller than string b if and only if one of the following holds:
* a is a proper prefix of b, that is, a is a prefix of b such that a ≠ b;
* There exists an integer 1 ≤ i ≤ min{(|a|, |b|)} such that a_i < b_i and a_j = b_j for 1 ≤ j < i.
Input
The first line of input contains a single integer t (1 ≤ t ≤ 1500) denoting the number of test cases. The next lines contain descriptions of the test cases.
Each test case consists of a single line containing two space-separated strings s and c (2 ≤ |s| ≤ 5000, 1 ≤ |c| ≤ 5000). The strings s and c consists of uppercase English letters.
It is guaranteed that the sum of |s| in the input is at most 5000 and the sum of the |c| in the input is at most 5000.
Output
For each test case, output a single line containing a single string, which is either
* the new name which is obtained after swapping no more than one pair of characters that is strictly lexicographically smaller than c. In case there are many possible such strings, you can output any of them;
* three dashes (the string "---" without quotes) if it is impossible.
Example
Input
3
AZAMON APPLE
AZAMON AAAAAAAAAAALIBABA
APPLE BANANA
Output
AMAZON
---
APPLE
Note
In the first test case, it is possible to swap the second and the fourth letters of the string and the resulting string "AMAZON" is lexicographically smaller than "APPLE".
It is impossible to improve the product's name in the second test case and satisfy all conditions.
In the third test case, it is possible not to swap a pair of characters. The name "APPLE" is lexicographically smaller than "BANANA". Note that there are other valid answers, e.g., "APPEL".
Submitted Solution:
```
def check():
pass
tests = int(input())
for __ in range(tests):
st1, st2 = input().split()
if st1[0] < st2[0]:
print(st1)
continue
i = 0
while i < len(min(st1, st2)) and st1[i] == st2[i]:
i += 1
if i < len(st1) and i < len(st2):
if st1[i] < st2[i]:
print(st1)
elif i < len(st1):
k = i
j = 0
newk = 0
while k < len(st1):
if st1[k] < st2[i]:
newk = k
elif st1[k] == st2[i]:
j = k
# print("J updated ", j)
k += 1
if newk:
k = newk
st1 = st1[:i] + st1[k] + st1[i + 1:k] + st1[i] + st1[k + 1:]
print(st1)
elif j:
k = j
st1 = st1[:i] + st1[k] + st1[i + 1:k] + st1[i] + st1[k + 1:]
newst1 = st1[i+1:]
st2 = st2[i+1:]
l = 0
while l < min(len(newst1), len(st2)) and newst1[l] == st2[l]:
l += 1
if l < len(newst1) and l < len(st2):
if newst1[l] < st2[l]:
print(st1)
else:
print('---')
elif len(newst1) < len(st2):
print(st1)
else:
print('---')
else:
print('---')
else:
print('---')
elif len(st1) < len(st2):
print(st1)
else:
print('---')
'''
9
AZAMON APPLE
AZAMON AAAAAAAAAAALIBABA
APPLE BANANA
BB AA
BBCDA ABC
BBCA AC
AAAB AAA
AAA AAB
BA A
AMAZON
---
APPLE
6
BB AA
BBCDA ABC
BBCA AC
AAAB AAA
AAA AAB
BA A
13
TTT TTTTTTTTTT
QQ QRE
SK KJQQ
PV EP
UU ZZN
BS BSSSS
GYYYYYYYTTTTTTTZ GTYYYYYYTTTTTTYZ
RC QCC
QA AQ
YA LAL
YY NYY
QZ ZQR
DGPX DE
TTT
QQ
---
---
UU
BS
---
CR
AQ
AY
---
QZ
---
ABCDFGHIJKLNPQTUWXZ input
ABCDFGHIJKLNPQTUWXZ
ABCDFGHIJKLNPQTUWXZ
ABCDEFGHIJKLMNOPRSTUVWXYZ
IUWWWWWWUUUUUUWZ
KV
NNNNN
ABCDEFGHIJKLMNOPRSTUVWXYZ
---
KV
NNNNN
---
---
'''
```
No
| 59,833
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Programmer Vasya is studying a new programming language &K*. The &K* language resembles the languages of the C family in its syntax. However, it is more powerful, which is why the rules of the actual C-like languages are unapplicable to it. To fully understand the statement, please read the language's description below carefully and follow it and not the similar rules in real programming languages.
There is a very powerful system of pointers on &K* — you can add an asterisk to the right of the existing type X — that will result in new type X * . That is called pointer-definition operation. Also, there is the operation that does the opposite — to any type of X, which is a pointer, you can add an ampersand — that will result in a type &X, to which refers X. That is called a dereference operation.
The &K* language has only two basic data types — void and errtype. Also, the language has operators typedef and typeof.
* The operator "typedef A B" defines a new data type B, which is equivalent to A. A can have asterisks and ampersands, and B cannot have them. For example, the operator typedef void** ptptvoid will create a new type ptptvoid, that can be used as void**.
* The operator "typeof A" returns type of A, brought to void, that is, returns the type void**...*, equivalent to it with the necessary number of asterisks (the number can possibly be zero). That is, having defined the ptptvoid type, as shown above, the typeof ptptvoid operator will return void**.
An attempt of dereferencing of the void type will lead to an error: to a special data type errtype. For errtype the following equation holds true: errtype* = &errtype = errtype. An attempt to use the data type that hasn't been defined before that will also lead to the errtype.
Using typedef, we can define one type several times. Of all the definitions only the last one is valid. However, all the types that have been defined earlier using this type do not change.
Let us also note that the dereference operation has the lower priority that the pointer operation, in other words &T * is always equal to T.
Note, that the operators are executed consecutively one by one. If we have two operators "typedef &void a" and "typedef a* b", then at first a becomes errtype, and after that b becomes errtype* = errtype, but not &void* = void (see sample 2).
Vasya does not yet fully understand this powerful technology, that's why he asked you to help him. Write a program that analyzes these operators.
Input
The first line contains an integer n (1 ≤ n ≤ 100) — the number of operators. Then follow n lines with operators. Each operator is of one of two types: either "typedef A B", or "typeof A". In the first case the B type differs from void and errtype types, and besides, doesn't have any asterisks and ampersands.
All the data type names are non-empty lines of no more than 20 lowercase Latin letters. The number of asterisks and ampersands separately in one type in any operator does not exceed 10, however if we bring some types to void with several asterisks, their number may exceed 10.
Output
For every typeof operator print on the single line the answer to that operator — the type that the given operator returned.
Examples
Input
5
typedef void* ptv
typeof ptv
typedef &&ptv node
typeof node
typeof &ptv
Output
void*
errtype
void
Input
17
typedef void* b
typedef b* c
typeof b
typeof c
typedef &b b
typeof b
typeof c
typedef &&b* c
typeof c
typedef &b* c
typeof c
typedef &void b
typeof b
typedef b******* c
typeof c
typedef &&b* c
typeof c
Output
void*
void**
void
void**
errtype
void
errtype
errtype
errtype
Note
Let's look at the second sample.
After the first two queries typedef the b type is equivalent to void*, and с — to void**.
The next query typedef redefines b — it is now equal to &b = &void* = void. At that, the с type doesn't change.
After that the с type is defined as &&b* = &&void* = &void = errtype. It doesn't influence the b type, that's why the next typedef defines c as &void* = void.
Then the b type is again redefined as &void = errtype.
Please note that the c type in the next query is defined exactly as errtype******* = errtype, and not &void******* = void******. The same happens in the last typedef.
Tags: implementation, strings
Correct Solution:
```
class CodeforcesTask87BSolution:
def __init__(self):
self.result = ''
self.n = 0
self.expressions = []
def read_input(self):
self.n = int(input())
for x in range(self.n):
self.expressions.append(input().split(" "))
def process_task(self):
result = []
lang_dict = {"void":0}
for expr in self.expressions:
if expr[0] == "typedef":
up = expr[1].count("*")
down = expr[1].count("&")
nm = expr[1].replace("*", "").replace("&", "")
if nm in lang_dict:
if lang_dict[nm] == -1:
lang_dict[expr[2]] = -1
else:
lang_dict[expr[2]] = max(-1, lang_dict[nm] + up - down)
else:
lang_dict[expr[2]] = -1
elif expr[0] == "typeof":
up = expr[1].count("*")
down = expr[1].count("&")
nm = expr[1].replace("*", "").replace("&", "")
if nm in lang_dict:
balance = max(lang_dict[nm] + up - down, -1)
if balance == -1 or lang_dict[nm] == -1:
result.append("errtype")
else:
result.append("void" + "*" * balance)
else:
result.append("errtype")
self.result = "\n".join(result)
def get_result(self):
return self.result
if __name__ == "__main__":
Solution = CodeforcesTask87BSolution()
Solution.read_input()
Solution.process_task()
print(Solution.get_result())
```
| 60,336
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Programmer Vasya is studying a new programming language &K*. The &K* language resembles the languages of the C family in its syntax. However, it is more powerful, which is why the rules of the actual C-like languages are unapplicable to it. To fully understand the statement, please read the language's description below carefully and follow it and not the similar rules in real programming languages.
There is a very powerful system of pointers on &K* — you can add an asterisk to the right of the existing type X — that will result in new type X * . That is called pointer-definition operation. Also, there is the operation that does the opposite — to any type of X, which is a pointer, you can add an ampersand — that will result in a type &X, to which refers X. That is called a dereference operation.
The &K* language has only two basic data types — void and errtype. Also, the language has operators typedef and typeof.
* The operator "typedef A B" defines a new data type B, which is equivalent to A. A can have asterisks and ampersands, and B cannot have them. For example, the operator typedef void** ptptvoid will create a new type ptptvoid, that can be used as void**.
* The operator "typeof A" returns type of A, brought to void, that is, returns the type void**...*, equivalent to it with the necessary number of asterisks (the number can possibly be zero). That is, having defined the ptptvoid type, as shown above, the typeof ptptvoid operator will return void**.
An attempt of dereferencing of the void type will lead to an error: to a special data type errtype. For errtype the following equation holds true: errtype* = &errtype = errtype. An attempt to use the data type that hasn't been defined before that will also lead to the errtype.
Using typedef, we can define one type several times. Of all the definitions only the last one is valid. However, all the types that have been defined earlier using this type do not change.
Let us also note that the dereference operation has the lower priority that the pointer operation, in other words &T * is always equal to T.
Note, that the operators are executed consecutively one by one. If we have two operators "typedef &void a" and "typedef a* b", then at first a becomes errtype, and after that b becomes errtype* = errtype, but not &void* = void (see sample 2).
Vasya does not yet fully understand this powerful technology, that's why he asked you to help him. Write a program that analyzes these operators.
Input
The first line contains an integer n (1 ≤ n ≤ 100) — the number of operators. Then follow n lines with operators. Each operator is of one of two types: either "typedef A B", or "typeof A". In the first case the B type differs from void and errtype types, and besides, doesn't have any asterisks and ampersands.
All the data type names are non-empty lines of no more than 20 lowercase Latin letters. The number of asterisks and ampersands separately in one type in any operator does not exceed 10, however if we bring some types to void with several asterisks, their number may exceed 10.
Output
For every typeof operator print on the single line the answer to that operator — the type that the given operator returned.
Examples
Input
5
typedef void* ptv
typeof ptv
typedef &&ptv node
typeof node
typeof &ptv
Output
void*
errtype
void
Input
17
typedef void* b
typedef b* c
typeof b
typeof c
typedef &b b
typeof b
typeof c
typedef &&b* c
typeof c
typedef &b* c
typeof c
typedef &void b
typeof b
typedef b******* c
typeof c
typedef &&b* c
typeof c
Output
void*
void**
void
void**
errtype
void
errtype
errtype
errtype
Note
Let's look at the second sample.
After the first two queries typedef the b type is equivalent to void*, and с — to void**.
The next query typedef redefines b — it is now equal to &b = &void* = void. At that, the с type doesn't change.
After that the с type is defined as &&b* = &&void* = &void = errtype. It doesn't influence the b type, that's why the next typedef defines c as &void* = void.
Then the b type is again redefined as &void = errtype.
Please note that the c type in the next query is defined exactly as errtype******* = errtype, and not &void******* = void******. The same happens in the last typedef.
Tags: implementation, strings
Correct Solution:
```
#!/usr/bin/env python3
n = int(input())
data = dict()
data['void'] = 0
def parse(definition):
ampersands = definition.count('&')
asterisks = definition.count('*')
name = definition[ampersands:len(definition)-asterisks]
return (name, asterisks - ampersands)
for i in range(n):
line = input().strip().split()
if (line[0] == 'typeof'):
(name, nr) = parse(line[1])
if (name in data) and ((data[name] + nr) >= 0):
print("void%s" % ("*"*(data[name] + nr)))
else:
print("errtype")
else:
new_name = line[2]
(old_name, nr) = parse(line[1])
if (old_name in data):
data[new_name] = data[old_name] + nr
if (data[new_name] < 0):
data.pop(new_name)
else:
data.pop(new_name, None)
```
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Programmer Vasya is studying a new programming language &K*. The &K* language resembles the languages of the C family in its syntax. However, it is more powerful, which is why the rules of the actual C-like languages are unapplicable to it. To fully understand the statement, please read the language's description below carefully and follow it and not the similar rules in real programming languages.
There is a very powerful system of pointers on &K* — you can add an asterisk to the right of the existing type X — that will result in new type X * . That is called pointer-definition operation. Also, there is the operation that does the opposite — to any type of X, which is a pointer, you can add an ampersand — that will result in a type &X, to which refers X. That is called a dereference operation.
The &K* language has only two basic data types — void and errtype. Also, the language has operators typedef and typeof.
* The operator "typedef A B" defines a new data type B, which is equivalent to A. A can have asterisks and ampersands, and B cannot have them. For example, the operator typedef void** ptptvoid will create a new type ptptvoid, that can be used as void**.
* The operator "typeof A" returns type of A, brought to void, that is, returns the type void**...*, equivalent to it with the necessary number of asterisks (the number can possibly be zero). That is, having defined the ptptvoid type, as shown above, the typeof ptptvoid operator will return void**.
An attempt of dereferencing of the void type will lead to an error: to a special data type errtype. For errtype the following equation holds true: errtype* = &errtype = errtype. An attempt to use the data type that hasn't been defined before that will also lead to the errtype.
Using typedef, we can define one type several times. Of all the definitions only the last one is valid. However, all the types that have been defined earlier using this type do not change.
Let us also note that the dereference operation has the lower priority that the pointer operation, in other words &T * is always equal to T.
Note, that the operators are executed consecutively one by one. If we have two operators "typedef &void a" and "typedef a* b", then at first a becomes errtype, and after that b becomes errtype* = errtype, but not &void* = void (see sample 2).
Vasya does not yet fully understand this powerful technology, that's why he asked you to help him. Write a program that analyzes these operators.
Input
The first line contains an integer n (1 ≤ n ≤ 100) — the number of operators. Then follow n lines with operators. Each operator is of one of two types: either "typedef A B", or "typeof A". In the first case the B type differs from void and errtype types, and besides, doesn't have any asterisks and ampersands.
All the data type names are non-empty lines of no more than 20 lowercase Latin letters. The number of asterisks and ampersands separately in one type in any operator does not exceed 10, however if we bring some types to void with several asterisks, their number may exceed 10.
Output
For every typeof operator print on the single line the answer to that operator — the type that the given operator returned.
Examples
Input
5
typedef void* ptv
typeof ptv
typedef &&ptv node
typeof node
typeof &ptv
Output
void*
errtype
void
Input
17
typedef void* b
typedef b* c
typeof b
typeof c
typedef &b b
typeof b
typeof c
typedef &&b* c
typeof c
typedef &b* c
typeof c
typedef &void b
typeof b
typedef b******* c
typeof c
typedef &&b* c
typeof c
Output
void*
void**
void
void**
errtype
void
errtype
errtype
errtype
Note
Let's look at the second sample.
After the first two queries typedef the b type is equivalent to void*, and с — to void**.
The next query typedef redefines b — it is now equal to &b = &void* = void. At that, the с type doesn't change.
After that the с type is defined as &&b* = &&void* = &void = errtype. It doesn't influence the b type, that's why the next typedef defines c as &void* = void.
Then the b type is again redefined as &void = errtype.
Please note that the c type in the next query is defined exactly as errtype******* = errtype, and not &void******* = void******. The same happens in the last typedef.
Tags: implementation, strings
Correct Solution:
```
from collections import *
import sys,re
lines = [i[:-1] for i in sys.stdin.readlines()]
n = int(lines[0])
lines = lines[1:]
typeof = defaultdict(lambda:'errtype')
typeof['void'] = 'void'
def simplify(s):
global typeof
l,r = s.count('&'),s.count('*')
result = typeof[s[l:len(s)-r]]
#print(l,r,result,s[l:len(s)-r])
if(result == 'errtype'):
return result
for i in range(r):
result = result+'*'
for i in range(l):
if(result[-1] == '*'):
result = result[:-1]
else:
return 'errtype'
return result
#print(simplify('void*'))
typeof['ptv'] = simplify('void*')
#print(typeof['ptv'])
#print(simplify('ptv'))
#exit()
for line in lines:
commands = line.split()
if(commands[0] == 'typeof'):
print(simplify(commands[1]))
else:
typeof[commands[2]] = simplify(commands[1])
#print(typeof['ptv'])
```
| 60,338
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Programmer Vasya is studying a new programming language &K*. The &K* language resembles the languages of the C family in its syntax. However, it is more powerful, which is why the rules of the actual C-like languages are unapplicable to it. To fully understand the statement, please read the language's description below carefully and follow it and not the similar rules in real programming languages.
There is a very powerful system of pointers on &K* — you can add an asterisk to the right of the existing type X — that will result in new type X * . That is called pointer-definition operation. Also, there is the operation that does the opposite — to any type of X, which is a pointer, you can add an ampersand — that will result in a type &X, to which refers X. That is called a dereference operation.
The &K* language has only two basic data types — void and errtype. Also, the language has operators typedef and typeof.
* The operator "typedef A B" defines a new data type B, which is equivalent to A. A can have asterisks and ampersands, and B cannot have them. For example, the operator typedef void** ptptvoid will create a new type ptptvoid, that can be used as void**.
* The operator "typeof A" returns type of A, brought to void, that is, returns the type void**...*, equivalent to it with the necessary number of asterisks (the number can possibly be zero). That is, having defined the ptptvoid type, as shown above, the typeof ptptvoid operator will return void**.
An attempt of dereferencing of the void type will lead to an error: to a special data type errtype. For errtype the following equation holds true: errtype* = &errtype = errtype. An attempt to use the data type that hasn't been defined before that will also lead to the errtype.
Using typedef, we can define one type several times. Of all the definitions only the last one is valid. However, all the types that have been defined earlier using this type do not change.
Let us also note that the dereference operation has the lower priority that the pointer operation, in other words &T * is always equal to T.
Note, that the operators are executed consecutively one by one. If we have two operators "typedef &void a" and "typedef a* b", then at first a becomes errtype, and after that b becomes errtype* = errtype, but not &void* = void (see sample 2).
Vasya does not yet fully understand this powerful technology, that's why he asked you to help him. Write a program that analyzes these operators.
Input
The first line contains an integer n (1 ≤ n ≤ 100) — the number of operators. Then follow n lines with operators. Each operator is of one of two types: either "typedef A B", or "typeof A". In the first case the B type differs from void and errtype types, and besides, doesn't have any asterisks and ampersands.
All the data type names are non-empty lines of no more than 20 lowercase Latin letters. The number of asterisks and ampersands separately in one type in any operator does not exceed 10, however if we bring some types to void with several asterisks, their number may exceed 10.
Output
For every typeof operator print on the single line the answer to that operator — the type that the given operator returned.
Examples
Input
5
typedef void* ptv
typeof ptv
typedef &&ptv node
typeof node
typeof &ptv
Output
void*
errtype
void
Input
17
typedef void* b
typedef b* c
typeof b
typeof c
typedef &b b
typeof b
typeof c
typedef &&b* c
typeof c
typedef &b* c
typeof c
typedef &void b
typeof b
typedef b******* c
typeof c
typedef &&b* c
typeof c
Output
void*
void**
void
void**
errtype
void
errtype
errtype
errtype
Note
Let's look at the second sample.
After the first two queries typedef the b type is equivalent to void*, and с — to void**.
The next query typedef redefines b — it is now equal to &b = &void* = void. At that, the с type doesn't change.
After that the с type is defined as &&b* = &&void* = &void = errtype. It doesn't influence the b type, that's why the next typedef defines c as &void* = void.
Then the b type is again redefined as &void = errtype.
Please note that the c type in the next query is defined exactly as errtype******* = errtype, and not &void******* = void******. The same happens in the last typedef.
Tags: implementation, strings
Correct Solution:
```
types = {'void':'void', 'errtype':'errtype'}
def getRealType(type_expr):
expr_type = type_expr.strip('&*')
full_type_name = type_expr.replace(expr_type, types.get(expr_type, "errtype"))
base_type = full_type_name.strip('&*')
if base_type == "void":
addr_count = full_type_name.count('*')
deref_count = full_type_name.count('&')
if deref_count > addr_count:
return "errtype"
return base_type + "*" * (addr_count - deref_count)
else:
return "errtype"
def setTypeAlias(type_expr, alias_name):
types[alias_name] = getRealType(type_expr)
n = int(input())
for _ in range(n):
operator = input().split()
command = operator[0]
if command == "typedef":
setTypeAlias(operator[1], operator[2])
else:
print(getRealType(operator[1]))
# Made By Mostafa_Khaled
```
| 60,339
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Programmer Vasya is studying a new programming language &K*. The &K* language resembles the languages of the C family in its syntax. However, it is more powerful, which is why the rules of the actual C-like languages are unapplicable to it. To fully understand the statement, please read the language's description below carefully and follow it and not the similar rules in real programming languages.
There is a very powerful system of pointers on &K* — you can add an asterisk to the right of the existing type X — that will result in new type X * . That is called pointer-definition operation. Also, there is the operation that does the opposite — to any type of X, which is a pointer, you can add an ampersand — that will result in a type &X, to which refers X. That is called a dereference operation.
The &K* language has only two basic data types — void and errtype. Also, the language has operators typedef and typeof.
* The operator "typedef A B" defines a new data type B, which is equivalent to A. A can have asterisks and ampersands, and B cannot have them. For example, the operator typedef void** ptptvoid will create a new type ptptvoid, that can be used as void**.
* The operator "typeof A" returns type of A, brought to void, that is, returns the type void**...*, equivalent to it with the necessary number of asterisks (the number can possibly be zero). That is, having defined the ptptvoid type, as shown above, the typeof ptptvoid operator will return void**.
An attempt of dereferencing of the void type will lead to an error: to a special data type errtype. For errtype the following equation holds true: errtype* = &errtype = errtype. An attempt to use the data type that hasn't been defined before that will also lead to the errtype.
Using typedef, we can define one type several times. Of all the definitions only the last one is valid. However, all the types that have been defined earlier using this type do not change.
Let us also note that the dereference operation has the lower priority that the pointer operation, in other words &T * is always equal to T.
Note, that the operators are executed consecutively one by one. If we have two operators "typedef &void a" and "typedef a* b", then at first a becomes errtype, and after that b becomes errtype* = errtype, but not &void* = void (see sample 2).
Vasya does not yet fully understand this powerful technology, that's why he asked you to help him. Write a program that analyzes these operators.
Input
The first line contains an integer n (1 ≤ n ≤ 100) — the number of operators. Then follow n lines with operators. Each operator is of one of two types: either "typedef A B", or "typeof A". In the first case the B type differs from void and errtype types, and besides, doesn't have any asterisks and ampersands.
All the data type names are non-empty lines of no more than 20 lowercase Latin letters. The number of asterisks and ampersands separately in one type in any operator does not exceed 10, however if we bring some types to void with several asterisks, their number may exceed 10.
Output
For every typeof operator print on the single line the answer to that operator — the type that the given operator returned.
Examples
Input
5
typedef void* ptv
typeof ptv
typedef &&ptv node
typeof node
typeof &ptv
Output
void*
errtype
void
Input
17
typedef void* b
typedef b* c
typeof b
typeof c
typedef &b b
typeof b
typeof c
typedef &&b* c
typeof c
typedef &b* c
typeof c
typedef &void b
typeof b
typedef b******* c
typeof c
typedef &&b* c
typeof c
Output
void*
void**
void
void**
errtype
void
errtype
errtype
errtype
Note
Let's look at the second sample.
After the first two queries typedef the b type is equivalent to void*, and с — to void**.
The next query typedef redefines b — it is now equal to &b = &void* = void. At that, the с type doesn't change.
After that the с type is defined as &&b* = &&void* = &void = errtype. It doesn't influence the b type, that's why the next typedef defines c as &void* = void.
Then the b type is again redefined as &void = errtype.
Please note that the c type in the next query is defined exactly as errtype******* = errtype, and not &void******* = void******. The same happens in the last typedef.
Tags: implementation, strings
Correct Solution:
```
types = {'void':'void', 'errtype':'errtype'}
def getRealType(type_expr):
expr_type = type_expr.strip('&*')
full_type_name = type_expr.replace(expr_type, types.get(expr_type, "errtype"))
base_type = full_type_name.strip('&*')
if base_type == "void":
addr_count = full_type_name.count('*')
deref_count = full_type_name.count('&')
if deref_count > addr_count:
return "errtype"
return base_type + "*" * (addr_count - deref_count)
else:
return "errtype"
def setTypeAlias(type_expr, alias_name):
types[alias_name] = getRealType(type_expr)
n = int(input())
for _ in range(n):
operator = input().split()
command = operator[0]
if command == "typedef":
setTypeAlias(operator[1], operator[2])
else:
print(getRealType(operator[1]))
```
| 60,340
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Programmer Vasya is studying a new programming language &K*. The &K* language resembles the languages of the C family in its syntax. However, it is more powerful, which is why the rules of the actual C-like languages are unapplicable to it. To fully understand the statement, please read the language's description below carefully and follow it and not the similar rules in real programming languages.
There is a very powerful system of pointers on &K* — you can add an asterisk to the right of the existing type X — that will result in new type X * . That is called pointer-definition operation. Also, there is the operation that does the opposite — to any type of X, which is a pointer, you can add an ampersand — that will result in a type &X, to which refers X. That is called a dereference operation.
The &K* language has only two basic data types — void and errtype. Also, the language has operators typedef and typeof.
* The operator "typedef A B" defines a new data type B, which is equivalent to A. A can have asterisks and ampersands, and B cannot have them. For example, the operator typedef void** ptptvoid will create a new type ptptvoid, that can be used as void**.
* The operator "typeof A" returns type of A, brought to void, that is, returns the type void**...*, equivalent to it with the necessary number of asterisks (the number can possibly be zero). That is, having defined the ptptvoid type, as shown above, the typeof ptptvoid operator will return void**.
An attempt of dereferencing of the void type will lead to an error: to a special data type errtype. For errtype the following equation holds true: errtype* = &errtype = errtype. An attempt to use the data type that hasn't been defined before that will also lead to the errtype.
Using typedef, we can define one type several times. Of all the definitions only the last one is valid. However, all the types that have been defined earlier using this type do not change.
Let us also note that the dereference operation has the lower priority that the pointer operation, in other words &T * is always equal to T.
Note, that the operators are executed consecutively one by one. If we have two operators "typedef &void a" and "typedef a* b", then at first a becomes errtype, and after that b becomes errtype* = errtype, but not &void* = void (see sample 2).
Vasya does not yet fully understand this powerful technology, that's why he asked you to help him. Write a program that analyzes these operators.
Input
The first line contains an integer n (1 ≤ n ≤ 100) — the number of operators. Then follow n lines with operators. Each operator is of one of two types: either "typedef A B", or "typeof A". In the first case the B type differs from void and errtype types, and besides, doesn't have any asterisks and ampersands.
All the data type names are non-empty lines of no more than 20 lowercase Latin letters. The number of asterisks and ampersands separately in one type in any operator does not exceed 10, however if we bring some types to void with several asterisks, their number may exceed 10.
Output
For every typeof operator print on the single line the answer to that operator — the type that the given operator returned.
Examples
Input
5
typedef void* ptv
typeof ptv
typedef &&ptv node
typeof node
typeof &ptv
Output
void*
errtype
void
Input
17
typedef void* b
typedef b* c
typeof b
typeof c
typedef &b b
typeof b
typeof c
typedef &&b* c
typeof c
typedef &b* c
typeof c
typedef &void b
typeof b
typedef b******* c
typeof c
typedef &&b* c
typeof c
Output
void*
void**
void
void**
errtype
void
errtype
errtype
errtype
Note
Let's look at the second sample.
After the first two queries typedef the b type is equivalent to void*, and с — to void**.
The next query typedef redefines b — it is now equal to &b = &void* = void. At that, the с type doesn't change.
After that the с type is defined as &&b* = &&void* = &void = errtype. It doesn't influence the b type, that's why the next typedef defines c as &void* = void.
Then the b type is again redefined as &void = errtype.
Please note that the c type in the next query is defined exactly as errtype******* = errtype, and not &void******* = void******. The same happens in the last typedef.
Tags: implementation, strings
Correct Solution:
```
n=int(input())
def Ref(v):
stars=0
ands=0
nam=""
for item in v:
if(item=='*'):
stars+=1
elif(item=='&'):
ands+=1
else:
nam+=item
if(nam not in T):
return "errtype"
x=T[nam]
if(x=="errtype"):
return str(x)
x+=stars
x-=ands
if(x<0):
return "errtype"
return x
T={'void':0}
for i in range(n):
s=input()
if(s[4]=='d'):
s=s[8:].split()
v=str(s[0])
name=str(s[1])
T[name]=Ref(v)
else:
s=s[7:]
x=Ref(str(s))
if(x=="errtype"):
print(x)
else:
print("void"+("*"*x))
```
| 60,341
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Programmer Vasya is studying a new programming language &K*. The &K* language resembles the languages of the C family in its syntax. However, it is more powerful, which is why the rules of the actual C-like languages are unapplicable to it. To fully understand the statement, please read the language's description below carefully and follow it and not the similar rules in real programming languages.
There is a very powerful system of pointers on &K* — you can add an asterisk to the right of the existing type X — that will result in new type X * . That is called pointer-definition operation. Also, there is the operation that does the opposite — to any type of X, which is a pointer, you can add an ampersand — that will result in a type &X, to which refers X. That is called a dereference operation.
The &K* language has only two basic data types — void and errtype. Also, the language has operators typedef and typeof.
* The operator "typedef A B" defines a new data type B, which is equivalent to A. A can have asterisks and ampersands, and B cannot have them. For example, the operator typedef void** ptptvoid will create a new type ptptvoid, that can be used as void**.
* The operator "typeof A" returns type of A, brought to void, that is, returns the type void**...*, equivalent to it with the necessary number of asterisks (the number can possibly be zero). That is, having defined the ptptvoid type, as shown above, the typeof ptptvoid operator will return void**.
An attempt of dereferencing of the void type will lead to an error: to a special data type errtype. For errtype the following equation holds true: errtype* = &errtype = errtype. An attempt to use the data type that hasn't been defined before that will also lead to the errtype.
Using typedef, we can define one type several times. Of all the definitions only the last one is valid. However, all the types that have been defined earlier using this type do not change.
Let us also note that the dereference operation has the lower priority that the pointer operation, in other words &T * is always equal to T.
Note, that the operators are executed consecutively one by one. If we have two operators "typedef &void a" and "typedef a* b", then at first a becomes errtype, and after that b becomes errtype* = errtype, but not &void* = void (see sample 2).
Vasya does not yet fully understand this powerful technology, that's why he asked you to help him. Write a program that analyzes these operators.
Input
The first line contains an integer n (1 ≤ n ≤ 100) — the number of operators. Then follow n lines with operators. Each operator is of one of two types: either "typedef A B", or "typeof A". In the first case the B type differs from void and errtype types, and besides, doesn't have any asterisks and ampersands.
All the data type names are non-empty lines of no more than 20 lowercase Latin letters. The number of asterisks and ampersands separately in one type in any operator does not exceed 10, however if we bring some types to void with several asterisks, their number may exceed 10.
Output
For every typeof operator print on the single line the answer to that operator — the type that the given operator returned.
Examples
Input
5
typedef void* ptv
typeof ptv
typedef &&ptv node
typeof node
typeof &ptv
Output
void*
errtype
void
Input
17
typedef void* b
typedef b* c
typeof b
typeof c
typedef &b b
typeof b
typeof c
typedef &&b* c
typeof c
typedef &b* c
typeof c
typedef &void b
typeof b
typedef b******* c
typeof c
typedef &&b* c
typeof c
Output
void*
void**
void
void**
errtype
void
errtype
errtype
errtype
Note
Let's look at the second sample.
After the first two queries typedef the b type is equivalent to void*, and с — to void**.
The next query typedef redefines b — it is now equal to &b = &void* = void. At that, the с type doesn't change.
After that the с type is defined as &&b* = &&void* = &void = errtype. It doesn't influence the b type, that's why the next typedef defines c as &void* = void.
Then the b type is again redefined as &void = errtype.
Please note that the c type in the next query is defined exactly as errtype******* = errtype, and not &void******* = void******. The same happens in the last typedef.
Tags: implementation, strings
Correct Solution:
```
def tr(v):
a = v.count('&')
b = v.count('*')
v = v.replace('&', '').replace('*', '')
if a > b:
a -= b
b = 0
else:
b -= a
a = 0
return '&' * a + v + '*' * b
def go(v):
i = v.replace('&', '').replace('*', '')
global val, err
if i not in val:
return 'errtype'
sub = val[i]
v = v.replace(i, sub)
v = tr(v)
for e in err:
if v.startswith(e) or v.endswith(e):
v = 'errtype'
break
return v
val = dict()
val['void'] = 'void'
err = ['&void', 'errtype', '&errtype', 'errtype*']
for i in range(int(input())):
cmd = input().split()
if cmd[0] == 'typeof':
v = cmd[1]
clean = tr(v)
print(go(v))
else:
fr, to = cmd[1], cmd[2]
val[to] = go(tr(fr))
```
| 60,342
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Programmer Vasya is studying a new programming language &K*. The &K* language resembles the languages of the C family in its syntax. However, it is more powerful, which is why the rules of the actual C-like languages are unapplicable to it. To fully understand the statement, please read the language's description below carefully and follow it and not the similar rules in real programming languages.
There is a very powerful system of pointers on &K* — you can add an asterisk to the right of the existing type X — that will result in new type X * . That is called pointer-definition operation. Also, there is the operation that does the opposite — to any type of X, which is a pointer, you can add an ampersand — that will result in a type &X, to which refers X. That is called a dereference operation.
The &K* language has only two basic data types — void and errtype. Also, the language has operators typedef and typeof.
* The operator "typedef A B" defines a new data type B, which is equivalent to A. A can have asterisks and ampersands, and B cannot have them. For example, the operator typedef void** ptptvoid will create a new type ptptvoid, that can be used as void**.
* The operator "typeof A" returns type of A, brought to void, that is, returns the type void**...*, equivalent to it with the necessary number of asterisks (the number can possibly be zero). That is, having defined the ptptvoid type, as shown above, the typeof ptptvoid operator will return void**.
An attempt of dereferencing of the void type will lead to an error: to a special data type errtype. For errtype the following equation holds true: errtype* = &errtype = errtype. An attempt to use the data type that hasn't been defined before that will also lead to the errtype.
Using typedef, we can define one type several times. Of all the definitions only the last one is valid. However, all the types that have been defined earlier using this type do not change.
Let us also note that the dereference operation has the lower priority that the pointer operation, in other words &T * is always equal to T.
Note, that the operators are executed consecutively one by one. If we have two operators "typedef &void a" and "typedef a* b", then at first a becomes errtype, and after that b becomes errtype* = errtype, but not &void* = void (see sample 2).
Vasya does not yet fully understand this powerful technology, that's why he asked you to help him. Write a program that analyzes these operators.
Input
The first line contains an integer n (1 ≤ n ≤ 100) — the number of operators. Then follow n lines with operators. Each operator is of one of two types: either "typedef A B", or "typeof A". In the first case the B type differs from void and errtype types, and besides, doesn't have any asterisks and ampersands.
All the data type names are non-empty lines of no more than 20 lowercase Latin letters. The number of asterisks and ampersands separately in one type in any operator does not exceed 10, however if we bring some types to void with several asterisks, their number may exceed 10.
Output
For every typeof operator print on the single line the answer to that operator — the type that the given operator returned.
Examples
Input
5
typedef void* ptv
typeof ptv
typedef &&ptv node
typeof node
typeof &ptv
Output
void*
errtype
void
Input
17
typedef void* b
typedef b* c
typeof b
typeof c
typedef &b b
typeof b
typeof c
typedef &&b* c
typeof c
typedef &b* c
typeof c
typedef &void b
typeof b
typedef b******* c
typeof c
typedef &&b* c
typeof c
Output
void*
void**
void
void**
errtype
void
errtype
errtype
errtype
Note
Let's look at the second sample.
After the first two queries typedef the b type is equivalent to void*, and с — to void**.
The next query typedef redefines b — it is now equal to &b = &void* = void. At that, the с type doesn't change.
After that the с type is defined as &&b* = &&void* = &void = errtype. It doesn't influence the b type, that's why the next typedef defines c as &void* = void.
Then the b type is again redefined as &void = errtype.
Please note that the c type in the next query is defined exactly as errtype******* = errtype, and not &void******* = void******. The same happens in the last typedef.
Tags: implementation, strings
Correct Solution:
```
#------------------------template--------------------------#
import os
import sys
# from math import *
from collections import *
# from fractions import *
# from heapq import*
from bisect import *
from io import BytesIO, IOBase
def vsInput():
sys.stdin = open('input.txt', 'r')
sys.stdout = open('output.txt', 'w')
BUFSIZE = 8192
class FastIO(IOBase):
newlines = 0
def __init__(self, file):
self._fd = file.fileno()
self.buffer = BytesIO()
self.writable = "x" in file.mode or "r" not in file.mode
self.write = self.buffer.write if self.writable else None
def read(self):
while True:
b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
if not b:
break
ptr = self.buffer.tell()
self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
self.newlines = 0
return self.buffer.read()
def readline(self):
while self.newlines == 0:
b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
self.newlines = b.count(b"\n") + (not b)
ptr = self.buffer.tell()
self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
self.newlines -= 1
return self.buffer.readline()
def flush(self):
if self.writable:
os.write(self._fd, self.buffer.getvalue())
self.buffer.truncate(0), self.buffer.seek(0)
class IOWrapper(IOBase):
def __init__(self, file):
self.buffer = FastIO(file)
self.flush = self.buffer.flush
self.writable = self.buffer.writable
self.write = lambda s: self.buffer.write(s.encode("ascii"))
self.read = lambda: self.buffer.read().decode("ascii")
self.readline = lambda: self.buffer.readline().decode("ascii")
sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)
input = lambda: sys.stdin.readline().rstrip("\r\n")
ALPHA='abcdefghijklmnopqrstuvwxyz'
M=10**9+7
EPS=1e-6
def Ceil(a,b): return a//b+int(a%b>0)
def value():return tuple(map(int,input().split()))
def array():return [int(i) for i in input().split()]
def Int():return int(input())
def Str():return input()
def arrayS():return [i for i in input().split()]
#-------------------------code---------------------------#
# vsInput()
def get(s):
if(s=="void" or s=='errtype'): return (s,0)
c1,c2=0,0
l=0
while(s[l]=='&'):
c1+=1
l+=1
r=len(s)-1
while(s[r]=='*'):
c2+=1
r-=1
if(r<l): return get('errtype')
here=c2-c1+cat[s[l:r+1]][1]
# print(s[l:r+1])
ans=get(cat[s[l:r+1]][0])
ans=(ans[0],ans[1]+here)
return ans
n=Int()
cat=defaultdict(lambda : ('errtype',0))
cat['void']=('void',0)
for i in range(n):
query=input()
if('typeof' in query):
_,var=query.split()
ans=get(var)
if(ans[1]<0 or ans[0]=='errtype'):
ans=('errtype',0)
print(ans[0],'*'*ans[1],sep="")
else:
_,ty,var=query.split()
ans=get(ty)
# print(ans)
if(ans[1]<0 or ans[0]=='errtype'):
ans=('errtype',0)
cat[var]=ans
```
| 60,343
|
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Programmer Vasya is studying a new programming language &K*. The &K* language resembles the languages of the C family in its syntax. However, it is more powerful, which is why the rules of the actual C-like languages are unapplicable to it. To fully understand the statement, please read the language's description below carefully and follow it and not the similar rules in real programming languages.
There is a very powerful system of pointers on &K* — you can add an asterisk to the right of the existing type X — that will result in new type X * . That is called pointer-definition operation. Also, there is the operation that does the opposite — to any type of X, which is a pointer, you can add an ampersand — that will result in a type &X, to which refers X. That is called a dereference operation.
The &K* language has only two basic data types — void and errtype. Also, the language has operators typedef and typeof.
* The operator "typedef A B" defines a new data type B, which is equivalent to A. A can have asterisks and ampersands, and B cannot have them. For example, the operator typedef void** ptptvoid will create a new type ptptvoid, that can be used as void**.
* The operator "typeof A" returns type of A, brought to void, that is, returns the type void**...*, equivalent to it with the necessary number of asterisks (the number can possibly be zero). That is, having defined the ptptvoid type, as shown above, the typeof ptptvoid operator will return void**.
An attempt of dereferencing of the void type will lead to an error: to a special data type errtype. For errtype the following equation holds true: errtype* = &errtype = errtype. An attempt to use the data type that hasn't been defined before that will also lead to the errtype.
Using typedef, we can define one type several times. Of all the definitions only the last one is valid. However, all the types that have been defined earlier using this type do not change.
Let us also note that the dereference operation has the lower priority that the pointer operation, in other words &T * is always equal to T.
Note, that the operators are executed consecutively one by one. If we have two operators "typedef &void a" and "typedef a* b", then at first a becomes errtype, and after that b becomes errtype* = errtype, but not &void* = void (see sample 2).
Vasya does not yet fully understand this powerful technology, that's why he asked you to help him. Write a program that analyzes these operators.
Input
The first line contains an integer n (1 ≤ n ≤ 100) — the number of operators. Then follow n lines with operators. Each operator is of one of two types: either "typedef A B", or "typeof A". In the first case the B type differs from void and errtype types, and besides, doesn't have any asterisks and ampersands.
All the data type names are non-empty lines of no more than 20 lowercase Latin letters. The number of asterisks and ampersands separately in one type in any operator does not exceed 10, however if we bring some types to void with several asterisks, their number may exceed 10.
Output
For every typeof operator print on the single line the answer to that operator — the type that the given operator returned.
Examples
Input
5
typedef void* ptv
typeof ptv
typedef &&ptv node
typeof node
typeof &ptv
Output
void*
errtype
void
Input
17
typedef void* b
typedef b* c
typeof b
typeof c
typedef &b b
typeof b
typeof c
typedef &&b* c
typeof c
typedef &b* c
typeof c
typedef &void b
typeof b
typedef b******* c
typeof c
typedef &&b* c
typeof c
Output
void*
void**
void
void**
errtype
void
errtype
errtype
errtype
Note
Let's look at the second sample.
After the first two queries typedef the b type is equivalent to void*, and с — to void**.
The next query typedef redefines b — it is now equal to &b = &void* = void. At that, the с type doesn't change.
After that the с type is defined as &&b* = &&void* = &void = errtype. It doesn't influence the b type, that's why the next typedef defines c as &void* = void.
Then the b type is again redefined as &void = errtype.
Please note that the c type in the next query is defined exactly as errtype******* = errtype, and not &void******* = void******. The same happens in the last typedef.
Submitted Solution:
```
# /*******************************************************************************
# * Author : Quantum Of Excellence
# * email : quantumofexcellence (at) gmail (dot) com
# * copyright : 2014 - 2015
# * date : 12 - 11 - 2015
# * Judge Status :
# * Problem Category :
# * file name : 75B.py
# * version : 1.0
# *
# * TERMS OF USE - Write a mail to the author before copying or reusing the content of this file
# * seeking our permission for the same.
# * Copying/reuse of the below code without the permission of the author is prohibited and illegal.
# *
# * All rights reserved by Quantum Of Excellence.
# ******************************************************************************/
# /*******************************************************************************
# * some pointers on the logic/idea -
# *
# *
# *******************************************************************************/
# test cases-
#import sys
#fi = open("g:\dump\input.in","r")
#sys.stdin = fi
u=input
r=str
n=int(u())
d=dict()
d["void"]=0
while(n):
w=u()
if(w[4]=='d'):
a,b,c=map(str,w.split())
c=r(c)
f=0
else:
a,b=map(str,w.split())
a,b=r(a),r(b)
f=1
p=b.count('*')
m=b.count('&')
b=b.replace('*','').replace('&','')
# if a==typedef
if(0==f):
if("void"==b):
if(p<m):d[c]=-1
else:d[c]=p-m
else:
if(b in d and d[b]>=0and d[b]+p-m>=0):
d[c]=d[b]+p-m
else:d[c]=-1
# if a==typeof
else:
t="void"
i=-1
if(b in d):i=d[b]
# if base type not erroneous
if(i>=0):
i+=p-m
if(i<0):
t="errtype"
else:
while(i):
t+="*"
i-=1
print(t)
n-=1
```
Yes
| 60,344
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Programmer Vasya is studying a new programming language &K*. The &K* language resembles the languages of the C family in its syntax. However, it is more powerful, which is why the rules of the actual C-like languages are unapplicable to it. To fully understand the statement, please read the language's description below carefully and follow it and not the similar rules in real programming languages.
There is a very powerful system of pointers on &K* — you can add an asterisk to the right of the existing type X — that will result in new type X * . That is called pointer-definition operation. Also, there is the operation that does the opposite — to any type of X, which is a pointer, you can add an ampersand — that will result in a type &X, to which refers X. That is called a dereference operation.
The &K* language has only two basic data types — void and errtype. Also, the language has operators typedef and typeof.
* The operator "typedef A B" defines a new data type B, which is equivalent to A. A can have asterisks and ampersands, and B cannot have them. For example, the operator typedef void** ptptvoid will create a new type ptptvoid, that can be used as void**.
* The operator "typeof A" returns type of A, brought to void, that is, returns the type void**...*, equivalent to it with the necessary number of asterisks (the number can possibly be zero). That is, having defined the ptptvoid type, as shown above, the typeof ptptvoid operator will return void**.
An attempt of dereferencing of the void type will lead to an error: to a special data type errtype. For errtype the following equation holds true: errtype* = &errtype = errtype. An attempt to use the data type that hasn't been defined before that will also lead to the errtype.
Using typedef, we can define one type several times. Of all the definitions only the last one is valid. However, all the types that have been defined earlier using this type do not change.
Let us also note that the dereference operation has the lower priority that the pointer operation, in other words &T * is always equal to T.
Note, that the operators are executed consecutively one by one. If we have two operators "typedef &void a" and "typedef a* b", then at first a becomes errtype, and after that b becomes errtype* = errtype, but not &void* = void (see sample 2).
Vasya does not yet fully understand this powerful technology, that's why he asked you to help him. Write a program that analyzes these operators.
Input
The first line contains an integer n (1 ≤ n ≤ 100) — the number of operators. Then follow n lines with operators. Each operator is of one of two types: either "typedef A B", or "typeof A". In the first case the B type differs from void and errtype types, and besides, doesn't have any asterisks and ampersands.
All the data type names are non-empty lines of no more than 20 lowercase Latin letters. The number of asterisks and ampersands separately in one type in any operator does not exceed 10, however if we bring some types to void with several asterisks, their number may exceed 10.
Output
For every typeof operator print on the single line the answer to that operator — the type that the given operator returned.
Examples
Input
5
typedef void* ptv
typeof ptv
typedef &&ptv node
typeof node
typeof &ptv
Output
void*
errtype
void
Input
17
typedef void* b
typedef b* c
typeof b
typeof c
typedef &b b
typeof b
typeof c
typedef &&b* c
typeof c
typedef &b* c
typeof c
typedef &void b
typeof b
typedef b******* c
typeof c
typedef &&b* c
typeof c
Output
void*
void**
void
void**
errtype
void
errtype
errtype
errtype
Note
Let's look at the second sample.
After the first two queries typedef the b type is equivalent to void*, and с — to void**.
The next query typedef redefines b — it is now equal to &b = &void* = void. At that, the с type doesn't change.
After that the с type is defined as &&b* = &&void* = &void = errtype. It doesn't influence the b type, that's why the next typedef defines c as &void* = void.
Then the b type is again redefined as &void = errtype.
Please note that the c type in the next query is defined exactly as errtype******* = errtype, and not &void******* = void******. The same happens in the last typedef.
Submitted Solution:
```
import sys
from array import array # noqa: F401
def input():
return sys.stdin.buffer.readline().decode('utf-8')
n = int(input())
name = {'void': 'void'}
errtype = 'errtype'
def resolve(t):
nest = 0
while t[-1] == '*':
nest += 1
t = t[:-1]
while t[0] == '&':
nest -= 1
t = t[1:]
if t not in name:
return errtype
t = name[t]
while nest < 0 and t[-1] == '*':
nest += 1
t = t[:-1]
if nest < 0:
return errtype
else:
return t + '*' * nest
def f(s):
if s[:7] == errtype:
return errtype
else:
return s
ans = []
for _ in range(n):
query = input().split()
if query[0] == 'typeof':
ans.append(f(resolve(query[1])))
else:
name[query[2]] = resolve(query[1])
print(*ans, sep='\n')
```
Yes
| 60,345
|
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Programmer Vasya is studying a new programming language &K*. The &K* language resembles the languages of the C family in its syntax. However, it is more powerful, which is why the rules of the actual C-like languages are unapplicable to it. To fully understand the statement, please read the language's description below carefully and follow it and not the similar rules in real programming languages.
There is a very powerful system of pointers on &K* — you can add an asterisk to the right of the existing type X — that will result in new type X * . That is called pointer-definition operation. Also, there is the operation that does the opposite — to any type of X, which is a pointer, you can add an ampersand — that will result in a type &X, to which refers X. That is called a dereference operation.
The &K* language has only two basic data types — void and errtype. Also, the language has operators typedef and typeof.
* The operator "typedef A B" defines a new data type B, which is equivalent to A. A can have asterisks and ampersands, and B cannot have them. For example, the operator typedef void** ptptvoid will create a new type ptptvoid, that can be used as void**.
* The operator "typeof A" returns type of A, brought to void, that is, returns the type void**...*, equivalent to it with the necessary number of asterisks (the number can possibly be zero). That is, having defined the ptptvoid type, as shown above, the typeof ptptvoid operator will return void**.
An attempt of dereferencing of the void type will lead to an error: to a special data type errtype. For errtype the following equation holds true: errtype* = &errtype = errtype. An attempt to use the data type that hasn't been defined before that will also lead to the errtype.
Using typedef, we can define one type several times. Of all the definitions only the last one is valid. However, all the types that have been defined earlier using this type do not change.
Let us also note that the dereference operation has the lower priority that the pointer operation, in other words &T * is always equal to T.
Note, that the operators are executed consecutively one by one. If we have two operators "typedef &void a" and "typedef a* b", then at first a becomes errtype, and after that b becomes errtype* = errtype, but not &void* = void (see sample 2).
Vasya does not yet fully understand this powerful technology, that's why he asked you to help him. Write a program that analyzes these operators.
Input
The first line contains an integer n (1 ≤ n ≤ 100) — the number of operators. Then follow n lines with operators. Each operator is of one of two types: either "typedef A B", or "typeof A". In the first case the B type differs from void and errtype types, and besides, doesn't have any asterisks and ampersands.
All the data type names are non-empty lines of no more than 20 lowercase Latin letters. The number of asterisks and ampersands separately in one type in any operator does not exceed 10, however if we bring some types to void with several asterisks, their number may exceed 10.
Output
For every typeof operator print on the single line the answer to that operator — the type that the given operator returned.
Examples
Input
5
typedef void* ptv
typeof ptv
typedef &&ptv node
typeof node
typeof &ptv
Output
void*
errtype
void
Input
17
typedef void* b
typedef b* c
typeof b
typeof c
typedef &b b
typeof b
typeof c
typedef &&b* c
typeof c
typedef &b* c
typeof c
typedef &void b
typeof b
typedef b******* c
typeof c
typedef &&b* c
typeof c
Output
void*
void**
void
void**
errtype
void
errtype
errtype
errtype
Note
Let's look at the second sample.
After the first two queries typedef the b type is equivalent to void*, and с — to void**.
The next query typedef redefines b — it is now equal to &b = &void* = void. At that, the с type doesn't change.
After that the с type is defined as &&b* = &&void* = &void = errtype. It doesn't influence the b type, that's why the next typedef defines c as &void* = void.
Then the b type is again redefined as &void = errtype.
Please note that the c type in the next query is defined exactly as errtype******* = errtype, and not &void******* = void******. The same happens in the last typedef.
Submitted Solution:
```
#------------------------template--------------------------#
import os
import sys
# from math import *
from collections import *
# from fractions import *
# from heapq import*
from bisect import *
from io import BytesIO, IOBase
def vsInput():
sys.stdin = open('input.txt', 'r')
sys.stdout = open('output.txt', 'w')
BUFSIZE = 8192
class FastIO(IOBase):
newlines = 0
def __init__(self, file):
self._fd = file.fileno()
self.buffer = BytesIO()
self.writable = "x" in file.mode or "r" not in file.mode
self.write = self.buffer.write if self.writable else None
def read(self):
while True:
b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
if not b:
break
ptr = self.buffer.tell()
self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
self.newlines = 0
return self.buffer.read()
def readline(self):
while self.newlines == 0:
b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
self.newlines = b.count(b"\n") + (not b)
ptr = self.buffer.tell()
self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
self.newlines -= 1
return self.buffer.readline()
def flush(self):
if self.writable:
os.write(self._fd, self.buffer.getvalue())
self.buffer.truncate(0), self.buffer.seek(0)
class IOWrapper(IOBase):
def __init__(self, file):
self.buffer = FastIO(file)
self.flush = self.buffer.flush
self.writable = self.buffer.writable
self.write = lambda s: self.buffer.write(s.encode("ascii"))
self.read = lambda: self.buffer.read().decode("ascii")
self.readline = lambda: self.buffer.readline().decode("ascii")
sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)
input = lambda: sys.stdin.readline().rstrip("\r\n")
ALPHA='abcdefghijklmnopqrstuvwxyz'
M=10**9+7
EPS=1e-6
def Ceil(a,b): return a//b+int(a%b>0)
def value():return tuple(map(int,input().split()))
def array():return [int(i) for i in input().split()]
def Int():return int(input())
def Str():return input()
def arrayS():return [i for i in input().split()]
#-------------------------code---------------------------#
# vsInput()
def get(s):
if(s=="void" or s=='errtype'): return (s,0)
c1,c2=0,0
l=0
while(s[l]=='&'):
c1+=1
l+=1
r=len(s)-1
while(s[r]=='*'):
c2+=1
r-=1
if(r<l): return get('errtype')
here=c2-c1+cat[s[l:r+1]][1]
# print(s[l:r+1])
ans=get(cat[s[l:r+1]][0])
ans=(ans[0],ans[1]+here)
return ans
n=Int()
cat=defaultdict(lambda : ('errtype',0))
cat['void']=('void',0)
for i in range(n):
query=input()
if('typeof' in query):
_,var=query.split()
ans=get(var)
if(ans[1]<0 or ans[0]=='errtype'):
ans=('errtype',0)
print(ans[0],'*'*ans[1])
else:
_,ty,var=query.split()
ans=get(ty)
# print(ans)
if(ans[1]<0 or ans[0]=='errtype'):
ans=('errtype',0)
cat[var]=ans
```
No
| 60,346
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Programmer Vasya is studying a new programming language &K*. The &K* language resembles the languages of the C family in its syntax. However, it is more powerful, which is why the rules of the actual C-like languages are unapplicable to it. To fully understand the statement, please read the language's description below carefully and follow it and not the similar rules in real programming languages.
There is a very powerful system of pointers on &K* — you can add an asterisk to the right of the existing type X — that will result in new type X * . That is called pointer-definition operation. Also, there is the operation that does the opposite — to any type of X, which is a pointer, you can add an ampersand — that will result in a type &X, to which refers X. That is called a dereference operation.
The &K* language has only two basic data types — void and errtype. Also, the language has operators typedef and typeof.
* The operator "typedef A B" defines a new data type B, which is equivalent to A. A can have asterisks and ampersands, and B cannot have them. For example, the operator typedef void** ptptvoid will create a new type ptptvoid, that can be used as void**.
* The operator "typeof A" returns type of A, brought to void, that is, returns the type void**...*, equivalent to it with the necessary number of asterisks (the number can possibly be zero). That is, having defined the ptptvoid type, as shown above, the typeof ptptvoid operator will return void**.
An attempt of dereferencing of the void type will lead to an error: to a special data type errtype. For errtype the following equation holds true: errtype* = &errtype = errtype. An attempt to use the data type that hasn't been defined before that will also lead to the errtype.
Using typedef, we can define one type several times. Of all the definitions only the last one is valid. However, all the types that have been defined earlier using this type do not change.
Let us also note that the dereference operation has the lower priority that the pointer operation, in other words &T * is always equal to T.
Note, that the operators are executed consecutively one by one. If we have two operators "typedef &void a" and "typedef a* b", then at first a becomes errtype, and after that b becomes errtype* = errtype, but not &void* = void (see sample 2).
Vasya does not yet fully understand this powerful technology, that's why he asked you to help him. Write a program that analyzes these operators.
Input
The first line contains an integer n (1 ≤ n ≤ 100) — the number of operators. Then follow n lines with operators. Each operator is of one of two types: either "typedef A B", or "typeof A". In the first case the B type differs from void and errtype types, and besides, doesn't have any asterisks and ampersands.
All the data type names are non-empty lines of no more than 20 lowercase Latin letters. The number of asterisks and ampersands separately in one type in any operator does not exceed 10, however if we bring some types to void with several asterisks, their number may exceed 10.
Output
For every typeof operator print on the single line the answer to that operator — the type that the given operator returned.
Examples
Input
5
typedef void* ptv
typeof ptv
typedef &&ptv node
typeof node
typeof &ptv
Output
void*
errtype
void
Input
17
typedef void* b
typedef b* c
typeof b
typeof c
typedef &b b
typeof b
typeof c
typedef &&b* c
typeof c
typedef &b* c
typeof c
typedef &void b
typeof b
typedef b******* c
typeof c
typedef &&b* c
typeof c
Output
void*
void**
void
void**
errtype
void
errtype
errtype
errtype
Note
Let's look at the second sample.
After the first two queries typedef the b type is equivalent to void*, and с — to void**.
The next query typedef redefines b — it is now equal to &b = &void* = void. At that, the с type doesn't change.
After that the с type is defined as &&b* = &&void* = &void = errtype. It doesn't influence the b type, that's why the next typedef defines c as &void* = void.
Then the b type is again redefined as &void = errtype.
Please note that the c type in the next query is defined exactly as errtype******* = errtype, and not &void******* = void******. The same happens in the last typedef.
Submitted Solution:
```
class CodeforcesTask87BSolution:
def __init__(self):
self.result = ''
self.n = 0
self.expressions = []
def read_input(self):
self.n = int(input())
for x in range(self.n):
self.expressions.append(input().split(" "))
def process_task(self):
result = []
lang_dict = {"void":0}
for expr in self.expressions:
if expr[0] == "typedef":
up = expr[1].count("*")
down = expr[1].count("&")
nm = expr[1].replace("*", "").replace("&", "")
if nm in lang_dict:
if lang_dict[nm] == -1:
lang_dict[expr[2]] = -1
else:
lang_dict[expr[2]] = max(-1, lang_dict[nm] + up - down)
else:
lang_dict[expr[2]] = -1
elif expr[0] == "typeof":
up = expr[1].count("*")
down = expr[1].count("&")
nm = expr[1].replace("*", "").replace("&", "")
if nm in lang_dict:
balance = max(lang_dict[nm] + up - down, -1)
if balance == -1:
result.append("errtype")
else:
result.append("void" + "*" * balance)
else:
result.append("errtype")
self.result = "\n".join(result)
def get_result(self):
return self.result
if __name__ == "__main__":
Solution = CodeforcesTask87BSolution()
Solution.read_input()
Solution.process_task()
print(Solution.get_result())
```
No
| 60,347
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
A new e-mail service "Berlandesk" is going to be opened in Berland in the near future. The site administration wants to launch their project as soon as possible, that's why they ask you to help. You're suggested to implement the prototype of site registration system. The system should work on the following principle.
Each time a new user wants to register, he sends to the system a request with his name. If such a name does not exist in the system database, it is inserted into the database, and the user gets the response OK, confirming the successful registration. If the name already exists in the system database, the system makes up a new user name, sends it to the user as a prompt and also inserts the prompt into the database. The new name is formed by the following rule. Numbers, starting with 1, are appended one after another to name (name1, name2, ...), among these numbers the least i is found so that namei does not yet exist in the database.
Input
The first line contains number n (1 ≤ n ≤ 105). The following n lines contain the requests to the system. Each request is a non-empty line, and consists of not more than 32 characters, which are all lowercase Latin letters.
Output
Print n lines, which are system responses to the requests: OK in case of successful registration, or a prompt with a new name, if the requested name is already taken.
Examples
Input
4
abacaba
acaba
abacaba
acab
Output
OK
OK
abacaba1
OK
Input
6
first
first
second
second
third
third
Output
OK
first1
OK
second1
OK
third1
Tags: data structures, hashing, implementation
Correct Solution:
```
a = int(input())
b = []
for i in range(a):
b.append(input())
s = {}
for i in b:
s[i] = 0
for i in b:
if s[i] > 0:
print(i + str(s[i]))
else:
print("OK")
s[i] += 1
```
| 61,067
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
A new e-mail service "Berlandesk" is going to be opened in Berland in the near future. The site administration wants to launch their project as soon as possible, that's why they ask you to help. You're suggested to implement the prototype of site registration system. The system should work on the following principle.
Each time a new user wants to register, he sends to the system a request with his name. If such a name does not exist in the system database, it is inserted into the database, and the user gets the response OK, confirming the successful registration. If the name already exists in the system database, the system makes up a new user name, sends it to the user as a prompt and also inserts the prompt into the database. The new name is formed by the following rule. Numbers, starting with 1, are appended one after another to name (name1, name2, ...), among these numbers the least i is found so that namei does not yet exist in the database.
Input
The first line contains number n (1 ≤ n ≤ 105). The following n lines contain the requests to the system. Each request is a non-empty line, and consists of not more than 32 characters, which are all lowercase Latin letters.
Output
Print n lines, which are system responses to the requests: OK in case of successful registration, or a prompt with a new name, if the requested name is already taken.
Examples
Input
4
abacaba
acaba
abacaba
acab
Output
OK
OK
abacaba1
OK
Input
6
first
first
second
second
third
third
Output
OK
first1
OK
second1
OK
third1
Tags: data structures, hashing, implementation
Correct Solution:
```
db = dict()
ls = []
for i in range(int(input())):
user = input()
if not db.get(user):
db[user] = 1
ls.append("OK")
else:
ls.append(user+str(db[user]))
db[user] += 1
print(*ls,sep="\n")
```
| 61,068
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
A new e-mail service "Berlandesk" is going to be opened in Berland in the near future. The site administration wants to launch their project as soon as possible, that's why they ask you to help. You're suggested to implement the prototype of site registration system. The system should work on the following principle.
Each time a new user wants to register, he sends to the system a request with his name. If such a name does not exist in the system database, it is inserted into the database, and the user gets the response OK, confirming the successful registration. If the name already exists in the system database, the system makes up a new user name, sends it to the user as a prompt and also inserts the prompt into the database. The new name is formed by the following rule. Numbers, starting with 1, are appended one after another to name (name1, name2, ...), among these numbers the least i is found so that namei does not yet exist in the database.
Input
The first line contains number n (1 ≤ n ≤ 105). The following n lines contain the requests to the system. Each request is a non-empty line, and consists of not more than 32 characters, which are all lowercase Latin letters.
Output
Print n lines, which are system responses to the requests: OK in case of successful registration, or a prompt with a new name, if the requested name is already taken.
Examples
Input
4
abacaba
acaba
abacaba
acab
Output
OK
OK
abacaba1
OK
Input
6
first
first
second
second
third
third
Output
OK
first1
OK
second1
OK
third1
Tags: data structures, hashing, implementation
Correct Solution:
```
compare = {}
for i in range(int(input())):
string = input()
if string not in compare:
print("OK")
compare[string]=1
else:
print(string+str(compare[string]))
compare[string] += 1
```
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
A new e-mail service "Berlandesk" is going to be opened in Berland in the near future. The site administration wants to launch their project as soon as possible, that's why they ask you to help. You're suggested to implement the prototype of site registration system. The system should work on the following principle.
Each time a new user wants to register, he sends to the system a request with his name. If such a name does not exist in the system database, it is inserted into the database, and the user gets the response OK, confirming the successful registration. If the name already exists in the system database, the system makes up a new user name, sends it to the user as a prompt and also inserts the prompt into the database. The new name is formed by the following rule. Numbers, starting with 1, are appended one after another to name (name1, name2, ...), among these numbers the least i is found so that namei does not yet exist in the database.
Input
The first line contains number n (1 ≤ n ≤ 105). The following n lines contain the requests to the system. Each request is a non-empty line, and consists of not more than 32 characters, which are all lowercase Latin letters.
Output
Print n lines, which are system responses to the requests: OK in case of successful registration, or a prompt with a new name, if the requested name is already taken.
Examples
Input
4
abacaba
acaba
abacaba
acab
Output
OK
OK
abacaba1
OK
Input
6
first
first
second
second
third
third
Output
OK
first1
OK
second1
OK
third1
Tags: data structures, hashing, implementation
Correct Solution:
```
n=int(input())
d={}
for i1 in range(n):
s=input()
s=s.replace('\r','')
if s not in d:
d[s]=1
print('OK')
else:
print('{}{}'.format(s,d[s]))
d[s]=d[s]+1
```
| 61,070
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
A new e-mail service "Berlandesk" is going to be opened in Berland in the near future. The site administration wants to launch their project as soon as possible, that's why they ask you to help. You're suggested to implement the prototype of site registration system. The system should work on the following principle.
Each time a new user wants to register, he sends to the system a request with his name. If such a name does not exist in the system database, it is inserted into the database, and the user gets the response OK, confirming the successful registration. If the name already exists in the system database, the system makes up a new user name, sends it to the user as a prompt and also inserts the prompt into the database. The new name is formed by the following rule. Numbers, starting with 1, are appended one after another to name (name1, name2, ...), among these numbers the least i is found so that namei does not yet exist in the database.
Input
The first line contains number n (1 ≤ n ≤ 105). The following n lines contain the requests to the system. Each request is a non-empty line, and consists of not more than 32 characters, which are all lowercase Latin letters.
Output
Print n lines, which are system responses to the requests: OK in case of successful registration, or a prompt with a new name, if the requested name is already taken.
Examples
Input
4
abacaba
acaba
abacaba
acab
Output
OK
OK
abacaba1
OK
Input
6
first
first
second
second
third
third
Output
OK
first1
OK
second1
OK
third1
Tags: data structures, hashing, implementation
Correct Solution:
```
import sys
n = int(sys.stdin.readline().strip())
lines = []
for i in range(0, n):
lines.append(sys.stdin.readline().strip())
database = {}
for line in lines:
if line in database:
name = database[line]
length = len(line)
index = int(name[length:])
suggestion = str(index + 1)
new_name = line + suggestion
database[line] = new_name
print(new_name)
else:
database[line] = line + '0'
print('OK')
```
| 61,071
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
A new e-mail service "Berlandesk" is going to be opened in Berland in the near future. The site administration wants to launch their project as soon as possible, that's why they ask you to help. You're suggested to implement the prototype of site registration system. The system should work on the following principle.
Each time a new user wants to register, he sends to the system a request with his name. If such a name does not exist in the system database, it is inserted into the database, and the user gets the response OK, confirming the successful registration. If the name already exists in the system database, the system makes up a new user name, sends it to the user as a prompt and also inserts the prompt into the database. The new name is formed by the following rule. Numbers, starting with 1, are appended one after another to name (name1, name2, ...), among these numbers the least i is found so that namei does not yet exist in the database.
Input
The first line contains number n (1 ≤ n ≤ 105). The following n lines contain the requests to the system. Each request is a non-empty line, and consists of not more than 32 characters, which are all lowercase Latin letters.
Output
Print n lines, which are system responses to the requests: OK in case of successful registration, or a prompt with a new name, if the requested name is already taken.
Examples
Input
4
abacaba
acaba
abacaba
acab
Output
OK
OK
abacaba1
OK
Input
6
first
first
second
second
third
third
Output
OK
first1
OK
second1
OK
third1
Tags: data structures, hashing, implementation
Correct Solution:
```
n = int(input())
dp = {}
for i in range(n):
a = input()
if a in dp:
dp[a] += 1
print(a + str(dp[a]))
else:
dp[a] = 0
print('OK')
```
| 61,072
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
A new e-mail service "Berlandesk" is going to be opened in Berland in the near future. The site administration wants to launch their project as soon as possible, that's why they ask you to help. You're suggested to implement the prototype of site registration system. The system should work on the following principle.
Each time a new user wants to register, he sends to the system a request with his name. If such a name does not exist in the system database, it is inserted into the database, and the user gets the response OK, confirming the successful registration. If the name already exists in the system database, the system makes up a new user name, sends it to the user as a prompt and also inserts the prompt into the database. The new name is formed by the following rule. Numbers, starting with 1, are appended one after another to name (name1, name2, ...), among these numbers the least i is found so that namei does not yet exist in the database.
Input
The first line contains number n (1 ≤ n ≤ 105). The following n lines contain the requests to the system. Each request is a non-empty line, and consists of not more than 32 characters, which are all lowercase Latin letters.
Output
Print n lines, which are system responses to the requests: OK in case of successful registration, or a prompt with a new name, if the requested name is already taken.
Examples
Input
4
abacaba
acaba
abacaba
acab
Output
OK
OK
abacaba1
OK
Input
6
first
first
second
second
third
third
Output
OK
first1
OK
second1
OK
third1
Tags: data structures, hashing, implementation
Correct Solution:
```
n = int(input())
usernames_map = {}
responses = []
for i in range(n):
username = input()
if username not in usernames_map:
usernames_map[username] = 1
responses.append('OK')
else:
responses.append(username + str(usernames_map[username]))
usernames_map[username] += 1
for res in responses:
print(res)
```
| 61,073
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
A new e-mail service "Berlandesk" is going to be opened in Berland in the near future. The site administration wants to launch their project as soon as possible, that's why they ask you to help. You're suggested to implement the prototype of site registration system. The system should work on the following principle.
Each time a new user wants to register, he sends to the system a request with his name. If such a name does not exist in the system database, it is inserted into the database, and the user gets the response OK, confirming the successful registration. If the name already exists in the system database, the system makes up a new user name, sends it to the user as a prompt and also inserts the prompt into the database. The new name is formed by the following rule. Numbers, starting with 1, are appended one after another to name (name1, name2, ...), among these numbers the least i is found so that namei does not yet exist in the database.
Input
The first line contains number n (1 ≤ n ≤ 105). The following n lines contain the requests to the system. Each request is a non-empty line, and consists of not more than 32 characters, which are all lowercase Latin letters.
Output
Print n lines, which are system responses to the requests: OK in case of successful registration, or a prompt with a new name, if the requested name is already taken.
Examples
Input
4
abacaba
acaba
abacaba
acab
Output
OK
OK
abacaba1
OK
Input
6
first
first
second
second
third
third
Output
OK
first1
OK
second1
OK
third1
Tags: data structures, hashing, implementation
Correct Solution:
```
d={}
for _ in range(int(input())):
k=input()
if k not in d.keys():
d[k]=[k,0]
print('OK')
else:
print(d[k][0]+str(d[k][1]+1))
d[k]=[k,d[k][1]+1]
```
| 61,074
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Pasha got a very beautiful string s for his birthday, the string consists of lowercase Latin letters. The letters in the string are numbered from 1 to |s| from left to right, where |s| is the length of the given string.
Pasha didn't like his present very much so he decided to change it. After his birthday Pasha spent m days performing the following transformations on his string — each day he chose integer ai and reversed a piece of string (a segment) from position ai to position |s| - ai + 1. It is guaranteed that 2·ai ≤ |s|.
You face the following task: determine what Pasha's string will look like after m days.
Input
The first line of the input contains Pasha's string s of length from 2 to 2·105 characters, consisting of lowercase Latin letters.
The second line contains a single integer m (1 ≤ m ≤ 105) — the number of days when Pasha changed his string.
The third line contains m space-separated elements ai (1 ≤ ai; 2·ai ≤ |s|) — the position from which Pasha started transforming the string on the i-th day.
Output
In the first line of the output print what Pasha's string s will look like after m days.
Examples
Input
abcdef
1
2
Output
aedcbf
Input
vwxyz
2
2 2
Output
vwxyz
Input
abcdef
3
1 2 3
Output
fbdcea
Tags: constructive algorithms, greedy, math, strings
Correct Solution:
```
s=list(input())
m=int(input())
n=len(s)
l=[0]*n
a=list(map(int,input().split()))
a.sort()
x=0
j=0
i=0
while i<n and j<m:
if i==a[j]-1:
if x==0:
l[i]=1
x=1
else:
l[i]=0
x=0
j+=1
else:
if x==1:
l[i]=1
i+=1
if x==1:
k=i+1
while k<=(n-i-1)//2:
l[k]=1
k+=1
for i in range(n):
if l[i]==1:
s[i],s[n-i-1]=s[n-i-1],s[i]
print("".join(s))
```
| 61,077
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Pasha got a very beautiful string s for his birthday, the string consists of lowercase Latin letters. The letters in the string are numbered from 1 to |s| from left to right, where |s| is the length of the given string.
Pasha didn't like his present very much so he decided to change it. After his birthday Pasha spent m days performing the following transformations on his string — each day he chose integer ai and reversed a piece of string (a segment) from position ai to position |s| - ai + 1. It is guaranteed that 2·ai ≤ |s|.
You face the following task: determine what Pasha's string will look like after m days.
Input
The first line of the input contains Pasha's string s of length from 2 to 2·105 characters, consisting of lowercase Latin letters.
The second line contains a single integer m (1 ≤ m ≤ 105) — the number of days when Pasha changed his string.
The third line contains m space-separated elements ai (1 ≤ ai; 2·ai ≤ |s|) — the position from which Pasha started transforming the string on the i-th day.
Output
In the first line of the output print what Pasha's string s will look like after m days.
Examples
Input
abcdef
1
2
Output
aedcbf
Input
vwxyz
2
2 2
Output
vwxyz
Input
abcdef
3
1 2 3
Output
fbdcea
Tags: constructive algorithms, greedy, math, strings
Correct Solution:
```
import math
def main():
S = input()
S = list(S)
L = len(S)
troca = [False for i in range(math.ceil(L/2))]
M = int(input())
linha = [int(i) for i in input().split()]
for i in range(M):
troca[linha[i] - 1] = not troca[linha[i] - 1]
temp = False
for i in range(len(troca)):
temp = (temp != troca[i])
if temp:
temp2 = S[i]
S[i] = S[L - 1 - i]
S[L - 1 - i] = temp2
print(''.join(S))
return
main()
# 1521829818229
```
| 61,081
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Recently, on a programming lesson little Petya showed how quickly he can create files and folders on the computer. But he got soon fed up with this activity, and he decided to do a much more useful thing. He decided to calculate what folder contains most subfolders (including nested folders, nested folders of nested folders, and so on) and what folder contains most files (including the files in the subfolders).
More formally, the subfolders of the folder are all its directly nested folders and the subfolders of these nested folders. The given folder is not considered the subfolder of itself. A file is regarded as lying in a folder, if and only if it either lies directly in this folder, or lies in some subfolder of the folder.
For a better understanding of how to count subfolders and files for calculating the answer, see notes and answers to the samples.
You are given a few files that Petya has managed to create. The path to each file looks as follows:
diskName:\folder1\folder2\...\ foldern\fileName
* diskName is single capital letter from the set {C,D,E,F,G}.
* folder1, ..., foldern are folder names. Each folder name is nonempty sequence of lowercase Latin letters and digits from 0 to 9. (n ≥ 1)
* fileName is a file name in the form of name.extension, where the name and the extension are nonempty sequences of lowercase Latin letters and digits from 0 to 9.
It is also known that there is no file whose path looks like diskName:\fileName. That is, each file is stored in some folder, but there are no files directly in the root. Also let us assume that the disk root is not a folder.
Help Petya to find the largest number of subfolders, which can be in some folder, and the largest number of files that can be in some folder, counting all its subfolders.
Input
Each line of input data contains the description of one file path. The length of each line does not exceed 100, and overall there are no more than 100 lines. It is guaranteed, that all the paths are correct and meet the above rules. It is also guaranteed, that there are no two completely equal lines. That is, each file is described exactly once.
There is at least one line in the input data.
Output
Print two space-separated numbers. The first one is the maximal number of possible subfolders in a folder (including nested folders, nested folders of nested folders, and so on). The second one is the maximal number of files in a folder (including nested files in subfolders). Note that the disks are not regarded as folders.
Examples
Input
C:<span class="tex-span">\</span>folder1<span class="tex-span">\</span>file1.txt
Output
0 1
Input
C:<span class="tex-span">\</span>folder1<span class="tex-span">\</span>folder2<span class="tex-span">\</span>folder3<span class="tex-span">\</span>file1.txt
C:<span class="tex-span">\</span>folder1<span class="tex-span">\</span>folder2<span class="tex-span">\</span>folder4<span class="tex-span">\</span>file1.txt
D:<span class="tex-span">\</span>folder1<span class="tex-span">\</span>file1.txt
Output
3 2
Input
C:<span class="tex-span">\</span>file<span class="tex-span">\</span>file<span class="tex-span">\</span>file<span class="tex-span">\</span>file<span class="tex-span">\</span>file.txt
C:<span class="tex-span">\</span>file<span class="tex-span">\</span>file<span class="tex-span">\</span>file<span class="tex-span">\</span>file2<span class="tex-span">\</span>file.txt
Output
4 2
Note
In the first sample we have one folder on the "C" disk. It has no subfolders, which is why the first number in the answer is 0. But this folder contains one file, so the second number of the answer is 1.
In the second sample we have several different folders. Consider the "folder1" folder on the "C" disk. This folder directly contains one folder, "folder2". The "folder2" folder contains two more folders — "folder3" and "folder4". Thus, the "folder1" folder on the "C" drive has exactly 3 subfolders. Also this folder contains two files, even though they do not lie directly in the folder, but they are located in subfolders of "folder1".
In the third example we see that the names of some folders and some subfolders are identical. Consider the "file" folder, which lies directly on the "C" disk. That folder contains another "file" folder, which in turn contains another "file" folder, which contains two more folders, "file" and "file2". Thus, the "file" folder, which lies directly on the "C" disk, contains 4 subfolders.
Tags: data structures, implementation
Correct Solution:
```
from collections import *
from sys import *
txt = stdin.readlines()
for i in range(len(txt)):
txt[i] = txt[i][:-1].replace(':\\', ':').split('\\')
file = Counter([s[0] for s in txt])
folder = defaultdict(set)
for i in txt:
for j in range(2, len(i)):
folder[i[0]].add('\\'.join(i[1:j]))
a = max([len(i) for i in folder.values()]+[0])
b = max(file.values())
print(a, b)
```
| 61,130
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Recently, on a programming lesson little Petya showed how quickly he can create files and folders on the computer. But he got soon fed up with this activity, and he decided to do a much more useful thing. He decided to calculate what folder contains most subfolders (including nested folders, nested folders of nested folders, and so on) and what folder contains most files (including the files in the subfolders).
More formally, the subfolders of the folder are all its directly nested folders and the subfolders of these nested folders. The given folder is not considered the subfolder of itself. A file is regarded as lying in a folder, if and only if it either lies directly in this folder, or lies in some subfolder of the folder.
For a better understanding of how to count subfolders and files for calculating the answer, see notes and answers to the samples.
You are given a few files that Petya has managed to create. The path to each file looks as follows:
diskName:\folder1\folder2\...\ foldern\fileName
* diskName is single capital letter from the set {C,D,E,F,G}.
* folder1, ..., foldern are folder names. Each folder name is nonempty sequence of lowercase Latin letters and digits from 0 to 9. (n ≥ 1)
* fileName is a file name in the form of name.extension, where the name and the extension are nonempty sequences of lowercase Latin letters and digits from 0 to 9.
It is also known that there is no file whose path looks like diskName:\fileName. That is, each file is stored in some folder, but there are no files directly in the root. Also let us assume that the disk root is not a folder.
Help Petya to find the largest number of subfolders, which can be in some folder, and the largest number of files that can be in some folder, counting all its subfolders.
Input
Each line of input data contains the description of one file path. The length of each line does not exceed 100, and overall there are no more than 100 lines. It is guaranteed, that all the paths are correct and meet the above rules. It is also guaranteed, that there are no two completely equal lines. That is, each file is described exactly once.
There is at least one line in the input data.
Output
Print two space-separated numbers. The first one is the maximal number of possible subfolders in a folder (including nested folders, nested folders of nested folders, and so on). The second one is the maximal number of files in a folder (including nested files in subfolders). Note that the disks are not regarded as folders.
Examples
Input
C:<span class="tex-span">\</span>folder1<span class="tex-span">\</span>file1.txt
Output
0 1
Input
C:<span class="tex-span">\</span>folder1<span class="tex-span">\</span>folder2<span class="tex-span">\</span>folder3<span class="tex-span">\</span>file1.txt
C:<span class="tex-span">\</span>folder1<span class="tex-span">\</span>folder2<span class="tex-span">\</span>folder4<span class="tex-span">\</span>file1.txt
D:<span class="tex-span">\</span>folder1<span class="tex-span">\</span>file1.txt
Output
3 2
Input
C:<span class="tex-span">\</span>file<span class="tex-span">\</span>file<span class="tex-span">\</span>file<span class="tex-span">\</span>file<span class="tex-span">\</span>file.txt
C:<span class="tex-span">\</span>file<span class="tex-span">\</span>file<span class="tex-span">\</span>file<span class="tex-span">\</span>file2<span class="tex-span">\</span>file.txt
Output
4 2
Note
In the first sample we have one folder on the "C" disk. It has no subfolders, which is why the first number in the answer is 0. But this folder contains one file, so the second number of the answer is 1.
In the second sample we have several different folders. Consider the "folder1" folder on the "C" disk. This folder directly contains one folder, "folder2". The "folder2" folder contains two more folders — "folder3" and "folder4". Thus, the "folder1" folder on the "C" drive has exactly 3 subfolders. Also this folder contains two files, even though they do not lie directly in the folder, but they are located in subfolders of "folder1".
In the third example we see that the names of some folders and some subfolders are identical. Consider the "file" folder, which lies directly on the "C" disk. That folder contains another "file" folder, which in turn contains another "file" folder, which contains two more folders, "file" and "file2". Thus, the "file" folder, which lies directly on the "C" disk, contains 4 subfolders.
Tags: data structures, implementation
Correct Solution:
```
#------------------------template--------------------------#
import os
import sys
from math import *
from collections import *
from fractions import *
from bisect import *
from heapq import*
from io import BytesIO, IOBase
def vsInput():
sys.stdin = open('input.txt', 'r')
sys.stdout = open('output.txt', 'w')
BUFSIZE = 8192
class FastIO(IOBase):
newlines = 0
def __init__(self, file):
self._fd = file.fileno()
self.buffer = BytesIO()
self.writable = "x" in file.mode or "r" not in file.mode
self.write = self.buffer.write if self.writable else None
def read(self):
while True:
b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
if not b:
break
ptr = self.buffer.tell()
self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
self.newlines = 0
return self.buffer.read()
def readline(self):
while self.newlines == 0:
b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
self.newlines = b.count(b"\n") + (not b)
ptr = self.buffer.tell()
self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
self.newlines -= 1
return self.buffer.readline()
def flush(self):
if self.writable:
os.write(self._fd, self.buffer.getvalue())
self.buffer.truncate(0), self.buffer.seek(0)
class IOWrapper(IOBase):
def __init__(self, file):
self.buffer = FastIO(file)
self.flush = self.buffer.flush
self.writable = self.buffer.writable
self.write = lambda s: self.buffer.write(s.encode("ascii"))
self.read = lambda: self.buffer.read().decode("ascii")
self.readline = lambda: self.buffer.readline().decode("ascii")
sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)
input = lambda: sys.stdin.readline().rstrip("\r\n")
ALPHA='abcdefghijklmnopqrstuvwxyz'
M=10**9+7
EPS=1e-6
def value():return tuple(map(int,input().split()))
def array():return [int(i) for i in input().split()]
def Int():return int(input())
def Str():return input()
def arrayS():return [i for i in input().split()]
#-------------------------code---------------------------#
# vsInput()
count=defaultdict(lambda : [set(),0])
while(True):
s=input()
if(len(s)==0): break
s=list(s.split('\\'))
# print(*s)
directory=s[0]
folder=s[1]
fileName=s[-1]
count[(directory,folder)][1]+=1
level=1
papa=folder
for i in s[2:-1]:
count[(directory,folder)][0].add((level,i+papa))
level+=1
papa+=i
# print(count)
maxfolders=0
maxFiles=0
for i in count:
maxfolders=max(maxfolders,len(count[i][0]))
maxFiles=max(maxFiles,count[i][1])
print(maxfolders,maxFiles)
```
| 61,131
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Recently, on a programming lesson little Petya showed how quickly he can create files and folders on the computer. But he got soon fed up with this activity, and he decided to do a much more useful thing. He decided to calculate what folder contains most subfolders (including nested folders, nested folders of nested folders, and so on) and what folder contains most files (including the files in the subfolders).
More formally, the subfolders of the folder are all its directly nested folders and the subfolders of these nested folders. The given folder is not considered the subfolder of itself. A file is regarded as lying in a folder, if and only if it either lies directly in this folder, or lies in some subfolder of the folder.
For a better understanding of how to count subfolders and files for calculating the answer, see notes and answers to the samples.
You are given a few files that Petya has managed to create. The path to each file looks as follows:
diskName:\folder1\folder2\...\ foldern\fileName
* diskName is single capital letter from the set {C,D,E,F,G}.
* folder1, ..., foldern are folder names. Each folder name is nonempty sequence of lowercase Latin letters and digits from 0 to 9. (n ≥ 1)
* fileName is a file name in the form of name.extension, where the name and the extension are nonempty sequences of lowercase Latin letters and digits from 0 to 9.
It is also known that there is no file whose path looks like diskName:\fileName. That is, each file is stored in some folder, but there are no files directly in the root. Also let us assume that the disk root is not a folder.
Help Petya to find the largest number of subfolders, which can be in some folder, and the largest number of files that can be in some folder, counting all its subfolders.
Input
Each line of input data contains the description of one file path. The length of each line does not exceed 100, and overall there are no more than 100 lines. It is guaranteed, that all the paths are correct and meet the above rules. It is also guaranteed, that there are no two completely equal lines. That is, each file is described exactly once.
There is at least one line in the input data.
Output
Print two space-separated numbers. The first one is the maximal number of possible subfolders in a folder (including nested folders, nested folders of nested folders, and so on). The second one is the maximal number of files in a folder (including nested files in subfolders). Note that the disks are not regarded as folders.
Examples
Input
C:<span class="tex-span">\</span>folder1<span class="tex-span">\</span>file1.txt
Output
0 1
Input
C:<span class="tex-span">\</span>folder1<span class="tex-span">\</span>folder2<span class="tex-span">\</span>folder3<span class="tex-span">\</span>file1.txt
C:<span class="tex-span">\</span>folder1<span class="tex-span">\</span>folder2<span class="tex-span">\</span>folder4<span class="tex-span">\</span>file1.txt
D:<span class="tex-span">\</span>folder1<span class="tex-span">\</span>file1.txt
Output
3 2
Input
C:<span class="tex-span">\</span>file<span class="tex-span">\</span>file<span class="tex-span">\</span>file<span class="tex-span">\</span>file<span class="tex-span">\</span>file.txt
C:<span class="tex-span">\</span>file<span class="tex-span">\</span>file<span class="tex-span">\</span>file<span class="tex-span">\</span>file2<span class="tex-span">\</span>file.txt
Output
4 2
Note
In the first sample we have one folder on the "C" disk. It has no subfolders, which is why the first number in the answer is 0. But this folder contains one file, so the second number of the answer is 1.
In the second sample we have several different folders. Consider the "folder1" folder on the "C" disk. This folder directly contains one folder, "folder2". The "folder2" folder contains two more folders — "folder3" and "folder4". Thus, the "folder1" folder on the "C" drive has exactly 3 subfolders. Also this folder contains two files, even though they do not lie directly in the folder, but they are located in subfolders of "folder1".
In the third example we see that the names of some folders and some subfolders are identical. Consider the "file" folder, which lies directly on the "C" disk. That folder contains another "file" folder, which in turn contains another "file" folder, which contains two more folders, "file" and "file2". Thus, the "file" folder, which lies directly on the "C" disk, contains 4 subfolders.
Tags: data structures, implementation
Correct Solution:
```
s = []
files = {}
folders = {}
for _ in range(101):
try: a = input()
except EOFError : break
s.append(a)
b = a.split("\\")
for i in range(2 ,len(b)):
path = tuple(b[:i])
if(path not in files):
files[path] = 0
folders[path] = set()
files[path] += 1
for j in range(i + 1 ,len(b)):
path2 = tuple(b[:j])
folders[path].add(path2)
print(f'{max([len(x) for x in folders.values()])} {max(files.values())}')
```
| 61,132
|
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] | 6
|
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