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Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. The country of Reberland is the archenemy of Berland. Recently the authorities of Berland arrested a Reberlandian spy who tried to bring the leaflets intended for agitational propaganda to Berland illegally . The most leaflets contain substrings of the Absolutely Inadmissible Swearword and maybe even the whole word. Berland legal system uses the difficult algorithm in order to determine the guilt of the spy. The main part of this algorithm is the following procedure. All the m leaflets that are brought by the spy are numbered from 1 to m. After that it's needed to get the answer to q queries of the following kind: "In which leaflet in the segment of numbers [l, r] the substring of the Absolutely Inadmissible Swearword [pl, pr] occurs more often?". The expert wants you to automate that procedure because this time texts of leaflets are too long. Help him! Input The first line contains the string s (1 ≤ |s| ≤ 5·105) — the Absolutely Inadmissible Swearword. The string s consists of only lowercase English letters. The second line contains the only integer m (1 ≤ m ≤ 5·104) — the number of texts of leaflets for expertise. Each of the next m lines contains the only string ti — the text of the i-th leaflet. The sum of lengths of all leaflet texts doesn't exceed 5·104. The text of the leaflets consists of only lowercase English letters. The next line contains integer q (1 ≤ q ≤ 5·105) — the number of queries for expertise. Finally, each of the last q lines contains four integers l, r, pl, pr (1 ≤ l ≤ r ≤ m, 1 ≤ pl ≤ pr ≤ |s|), where |s| is the length of the Absolutely Inadmissible Swearword. Output Print q lines. The i-th of them should contain two integers — the number of the text with the most occurences and the number of occurences of the substring [pl, pr] of the string s. If there are several text numbers print the smallest one. Examples Input suffixtree 3 suffixtreesareawesome cartesiantreeisworsethansegmenttree nyeeheeheee 2 1 2 1 10 1 3 9 10 Output 1 1 3 4 Submitted Solution: ``` s = input() m = int(input()) t = [] for i in range(m): t.append(input()) m = int(input()) data = [] for i in range(m): data.append(list(map(int,input().split()))) for q in data: sub = s[q[2]-1: q[3]] maximo = 0 lo = len(s) index = q[0]-1 for i in range(q[0]-1,q[1]): temp = t[i] contador = 0 for j in range(len(temp)+1 - len(sub)): if sub == temp[j:j+len(sub)]: contador+=1 if contador == 0: maximo = contador index = i + 1 contador = 0 lo = len(temp) elif contador==maximo and len(temp)<=lo: maximo = contador index = i + 1 contador = 0 lo = len(temp) elif contador>= maximo: maximo = contador index = i + 1 contador = 0 lo = len(temp) print(index, maximo) ``` No
21,637
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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. The country of Reberland is the archenemy of Berland. Recently the authorities of Berland arrested a Reberlandian spy who tried to bring the leaflets intended for agitational propaganda to Berland illegally . The most leaflets contain substrings of the Absolutely Inadmissible Swearword and maybe even the whole word. Berland legal system uses the difficult algorithm in order to determine the guilt of the spy. The main part of this algorithm is the following procedure. All the m leaflets that are brought by the spy are numbered from 1 to m. After that it's needed to get the answer to q queries of the following kind: "In which leaflet in the segment of numbers [l, r] the substring of the Absolutely Inadmissible Swearword [pl, pr] occurs more often?". The expert wants you to automate that procedure because this time texts of leaflets are too long. Help him! Input The first line contains the string s (1 ≤ |s| ≤ 5·105) — the Absolutely Inadmissible Swearword. The string s consists of only lowercase English letters. The second line contains the only integer m (1 ≤ m ≤ 5·104) — the number of texts of leaflets for expertise. Each of the next m lines contains the only string ti — the text of the i-th leaflet. The sum of lengths of all leaflet texts doesn't exceed 5·104. The text of the leaflets consists of only lowercase English letters. The next line contains integer q (1 ≤ q ≤ 5·105) — the number of queries for expertise. Finally, each of the last q lines contains four integers l, r, pl, pr (1 ≤ l ≤ r ≤ m, 1 ≤ pl ≤ pr ≤ |s|), where |s| is the length of the Absolutely Inadmissible Swearword. Output Print q lines. The i-th of them should contain two integers — the number of the text with the most occurences and the number of occurences of the substring [pl, pr] of the string s. If there are several text numbers print the smallest one. Examples Input suffixtree 3 suffixtreesareawesome cartesiantreeisworsethansegmenttree nyeeheeheee 2 1 2 1 10 1 3 9 10 Output 1 1 3 4 Submitted Solution: ``` import re leaflets = [] queries = [] def handleString(data): """String data to compare in the leaflets""" for query in queries: count = 0 nomin = 1 iterval = 0 tdata = data[query[2]-1:query[3]] for strdata in leaflets[query[0]-1:query[1]]: temp = start = 0 iterval = iterval + 1 while True: start = strdata.find(tdata, start) + 1 if start > 0: temp = temp + 1 else: break if temp > count: count = temp nomin = iterval print("{0} {1}".format(nomin, count)) def main(): data = input() leaflet_count = int(input()) for i in range(leaflet_count): leaflets.append(input()) query_count = int(input()) for j in range(query_count): query_data = input() queries.append(list(map(int, query_data.split()))) handleString(data) if __name__ == '__main__': main() ``` No
21,638
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Little Nastya has a hobby, she likes to remove some letters from word, to obtain another word. But it turns out to be pretty hard for her, because she is too young. Therefore, her brother Sergey always helps her. Sergey gives Nastya the word t and wants to get the word p out of it. Nastya removes letters in a certain order (one after another, in this order strictly), which is specified by permutation of letters' indices of the word t: a1... a|t|. We denote the length of word x as |x|. Note that after removing one letter, the indices of other letters don't change. For example, if t = "nastya" and a = [4, 1, 5, 3, 2, 6] then removals make the following sequence of words "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya". Sergey knows this permutation. His goal is to stop his sister at some point and continue removing by himself to get the word p. Since Nastya likes this activity, Sergey wants to stop her as late as possible. Your task is to determine, how many letters Nastya can remove before she will be stopped by Sergey. It is guaranteed that the word p can be obtained by removing the letters from word t. Input The first and second lines of the input contain the words t and p, respectively. Words are composed of lowercase letters of the Latin alphabet (1 ≤ |p| < |t| ≤ 200 000). It is guaranteed that the word p can be obtained by removing the letters from word t. Next line contains a permutation a1, a2, ..., a|t| of letter indices that specifies the order in which Nastya removes letters of t (1 ≤ ai ≤ |t|, all ai are distinct). Output Print a single integer number, the maximum number of letters that Nastya can remove. Examples Input ababcba abb 5 3 4 1 7 6 2 Output 3 Input bbbabb bb 1 6 3 4 2 5 Output 4 Note In the first sample test sequence of removing made by Nastya looks like this: "ababcba" <image> "ababcba" <image> "ababcba" <image> "ababcba" Nastya can not continue, because it is impossible to get word "abb" from word "ababcba". So, Nastya will remove only three letters. Tags: binary search, greedy, strings Correct Solution: ``` a=input() b=input() c=[int(i)-1 for i in input().split()] l=0;r=len(a) while r-l>1: m=l+(r-l)//2 d=list(a) j=0 for i in range(m): d[c[i]]='' # print(d,i) for i in range(len(a)): if d[i]==b[j]: # print(d) j+=1 if j==len(b): l=m;break if j!=len(b):r=m print(l) ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Little Nastya has a hobby, she likes to remove some letters from word, to obtain another word. But it turns out to be pretty hard for her, because she is too young. Therefore, her brother Sergey always helps her. Sergey gives Nastya the word t and wants to get the word p out of it. Nastya removes letters in a certain order (one after another, in this order strictly), which is specified by permutation of letters' indices of the word t: a1... a|t|. We denote the length of word x as |x|. Note that after removing one letter, the indices of other letters don't change. For example, if t = "nastya" and a = [4, 1, 5, 3, 2, 6] then removals make the following sequence of words "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya". Sergey knows this permutation. His goal is to stop his sister at some point and continue removing by himself to get the word p. Since Nastya likes this activity, Sergey wants to stop her as late as possible. Your task is to determine, how many letters Nastya can remove before she will be stopped by Sergey. It is guaranteed that the word p can be obtained by removing the letters from word t. Input The first and second lines of the input contain the words t and p, respectively. Words are composed of lowercase letters of the Latin alphabet (1 ≤ |p| < |t| ≤ 200 000). It is guaranteed that the word p can be obtained by removing the letters from word t. Next line contains a permutation a1, a2, ..., a|t| of letter indices that specifies the order in which Nastya removes letters of t (1 ≤ ai ≤ |t|, all ai are distinct). Output Print a single integer number, the maximum number of letters that Nastya can remove. Examples Input ababcba abb 5 3 4 1 7 6 2 Output 3 Input bbbabb bb 1 6 3 4 2 5 Output 4 Note In the first sample test sequence of removing made by Nastya looks like this: "ababcba" <image> "ababcba" <image> "ababcba" <image> "ababcba" Nastya can not continue, because it is impossible to get word "abb" from word "ababcba". So, Nastya will remove only three letters. Tags: binary search, greedy, strings Correct Solution: ``` import math as mt import sys,string input=sys.stdin.readline import random from collections import deque,defaultdict L=lambda : list(map(int,input().split())) Ls=lambda : list(input().split()) M=lambda : map(int,input().split()) I=lambda :int(input()) def isSubseq(s,b,v): i=0 j=0 while(i<len(s) and j<len(b)): if(s[i]==b[j] and v[i]==1): j+=1 i+=1 else: i+=1 if(j==len(b)): return True else: return False a=input().strip() b=input().strip() s=L() l=0 ans=0 h=len(a) while(l<=h): t=mt.ceil((l+h)/2) v=[1 for j in range(len(a))] for i in range(t): v[s[i]-1]=0 if(isSubseq(a,b,v)): #print(t,"P") ans=t l=t+1 else: h=t-1 print(ans) ```
21,662
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Little Nastya has a hobby, she likes to remove some letters from word, to obtain another word. But it turns out to be pretty hard for her, because she is too young. Therefore, her brother Sergey always helps her. Sergey gives Nastya the word t and wants to get the word p out of it. Nastya removes letters in a certain order (one after another, in this order strictly), which is specified by permutation of letters' indices of the word t: a1... a|t|. We denote the length of word x as |x|. Note that after removing one letter, the indices of other letters don't change. For example, if t = "nastya" and a = [4, 1, 5, 3, 2, 6] then removals make the following sequence of words "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya". Sergey knows this permutation. His goal is to stop his sister at some point and continue removing by himself to get the word p. Since Nastya likes this activity, Sergey wants to stop her as late as possible. Your task is to determine, how many letters Nastya can remove before she will be stopped by Sergey. It is guaranteed that the word p can be obtained by removing the letters from word t. Input The first and second lines of the input contain the words t and p, respectively. Words are composed of lowercase letters of the Latin alphabet (1 ≤ |p| < |t| ≤ 200 000). It is guaranteed that the word p can be obtained by removing the letters from word t. Next line contains a permutation a1, a2, ..., a|t| of letter indices that specifies the order in which Nastya removes letters of t (1 ≤ ai ≤ |t|, all ai are distinct). Output Print a single integer number, the maximum number of letters that Nastya can remove. Examples Input ababcba abb 5 3 4 1 7 6 2 Output 3 Input bbbabb bb 1 6 3 4 2 5 Output 4 Note In the first sample test sequence of removing made by Nastya looks like this: "ababcba" <image> "ababcba" <image> "ababcba" <image> "ababcba" Nastya can not continue, because it is impossible to get word "abb" from word "ababcba". So, Nastya will remove only three letters. Tags: binary search, greedy, strings Correct Solution: ``` a = input() b = input() c = [i-1 for i in list(map(int,input().split()))] l = 0 r = len(a) while r-l>1: m = l + (r-l) // 2 d = list(a) j = 0 for i in range(m):d[c[i]] = '' for i in range(len(a)): if d[i]==b[j]: j += 1 if j == len(b): l = m break if j!=len(b): r = m print(l) ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Little Nastya has a hobby, she likes to remove some letters from word, to obtain another word. But it turns out to be pretty hard for her, because she is too young. Therefore, her brother Sergey always helps her. Sergey gives Nastya the word t and wants to get the word p out of it. Nastya removes letters in a certain order (one after another, in this order strictly), which is specified by permutation of letters' indices of the word t: a1... a|t|. We denote the length of word x as |x|. Note that after removing one letter, the indices of other letters don't change. For example, if t = "nastya" and a = [4, 1, 5, 3, 2, 6] then removals make the following sequence of words "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya". Sergey knows this permutation. His goal is to stop his sister at some point and continue removing by himself to get the word p. Since Nastya likes this activity, Sergey wants to stop her as late as possible. Your task is to determine, how many letters Nastya can remove before she will be stopped by Sergey. It is guaranteed that the word p can be obtained by removing the letters from word t. Input The first and second lines of the input contain the words t and p, respectively. Words are composed of lowercase letters of the Latin alphabet (1 ≤ |p| < |t| ≤ 200 000). It is guaranteed that the word p can be obtained by removing the letters from word t. Next line contains a permutation a1, a2, ..., a|t| of letter indices that specifies the order in which Nastya removes letters of t (1 ≤ ai ≤ |t|, all ai are distinct). Output Print a single integer number, the maximum number of letters that Nastya can remove. Examples Input ababcba abb 5 3 4 1 7 6 2 Output 3 Input bbbabb bb 1 6 3 4 2 5 Output 4 Note In the first sample test sequence of removing made by Nastya looks like this: "ababcba" <image> "ababcba" <image> "ababcba" <image> "ababcba" Nastya can not continue, because it is impossible to get word "abb" from word "ababcba". So, Nastya will remove only three letters. Tags: binary search, greedy, strings Correct Solution: ``` s = input() t = input() a = [int(x) - 1 for x in input().split()] def ok(n): bad = set(a[:n]) it = (a for i, a in enumerate(s) if i not in bad) return all(c in it for c in t) low = 0 high = len(s) while low <= high: mid = (high + low) // 2 if (ok(mid)): low = mid + 1 poss = mid else: high = mid - 1 print (poss) ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Little Nastya has a hobby, she likes to remove some letters from word, to obtain another word. But it turns out to be pretty hard for her, because she is too young. Therefore, her brother Sergey always helps her. Sergey gives Nastya the word t and wants to get the word p out of it. Nastya removes letters in a certain order (one after another, in this order strictly), which is specified by permutation of letters' indices of the word t: a1... a|t|. We denote the length of word x as |x|. Note that after removing one letter, the indices of other letters don't change. For example, if t = "nastya" and a = [4, 1, 5, 3, 2, 6] then removals make the following sequence of words "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya". Sergey knows this permutation. His goal is to stop his sister at some point and continue removing by himself to get the word p. Since Nastya likes this activity, Sergey wants to stop her as late as possible. Your task is to determine, how many letters Nastya can remove before she will be stopped by Sergey. It is guaranteed that the word p can be obtained by removing the letters from word t. Input The first and second lines of the input contain the words t and p, respectively. Words are composed of lowercase letters of the Latin alphabet (1 ≤ |p| < |t| ≤ 200 000). It is guaranteed that the word p can be obtained by removing the letters from word t. Next line contains a permutation a1, a2, ..., a|t| of letter indices that specifies the order in which Nastya removes letters of t (1 ≤ ai ≤ |t|, all ai are distinct). Output Print a single integer number, the maximum number of letters that Nastya can remove. Examples Input ababcba abb 5 3 4 1 7 6 2 Output 3 Input bbbabb bb 1 6 3 4 2 5 Output 4 Note In the first sample test sequence of removing made by Nastya looks like this: "ababcba" <image> "ababcba" <image> "ababcba" <image> "ababcba" Nastya can not continue, because it is impossible to get word "abb" from word "ababcba". So, Nastya will remove only three letters. Tags: binary search, greedy, strings Correct Solution: ``` def subset(S,s): i = 0 j = 0 while i<len(S) and j<len(s): if S[i]==s[j]: i+=1 j+=1 else: i+=1 if j==len(s): return True return False n = input() a = input() arr = [int(x)-1 for x in input().split()] new = [] l = 0 r = len(n) while l<r: mid = (l+r+1)//2 sa = arr[:mid] new = list(n) for i in sa: new[i] = '' if subset(''.join(new),a): l = mid else: r = mid-1 print(r) ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Little Nastya has a hobby, she likes to remove some letters from word, to obtain another word. But it turns out to be pretty hard for her, because she is too young. Therefore, her brother Sergey always helps her. Sergey gives Nastya the word t and wants to get the word p out of it. Nastya removes letters in a certain order (one after another, in this order strictly), which is specified by permutation of letters' indices of the word t: a1... a|t|. We denote the length of word x as |x|. Note that after removing one letter, the indices of other letters don't change. For example, if t = "nastya" and a = [4, 1, 5, 3, 2, 6] then removals make the following sequence of words "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya". Sergey knows this permutation. His goal is to stop his sister at some point and continue removing by himself to get the word p. Since Nastya likes this activity, Sergey wants to stop her as late as possible. Your task is to determine, how many letters Nastya can remove before she will be stopped by Sergey. It is guaranteed that the word p can be obtained by removing the letters from word t. Input The first and second lines of the input contain the words t and p, respectively. Words are composed of lowercase letters of the Latin alphabet (1 ≤ |p| < |t| ≤ 200 000). It is guaranteed that the word p can be obtained by removing the letters from word t. Next line contains a permutation a1, a2, ..., a|t| of letter indices that specifies the order in which Nastya removes letters of t (1 ≤ ai ≤ |t|, all ai are distinct). Output Print a single integer number, the maximum number of letters that Nastya can remove. Examples Input ababcba abb 5 3 4 1 7 6 2 Output 3 Input bbbabb bb 1 6 3 4 2 5 Output 4 Note In the first sample test sequence of removing made by Nastya looks like this: "ababcba" <image> "ababcba" <image> "ababcba" <image> "ababcba" Nastya can not continue, because it is impossible to get word "abb" from word "ababcba". So, Nastya will remove only three letters. Tags: binary search, greedy, strings Correct Solution: ``` s = (input()) p = (input()) a = [i-1 for i in list(map(int,input().split()))] left = 0 right = len(s) while right - left > 1: d = list(s) mid = int((left + right)/2) for i in range(mid): d[a[i]] = '' j = 0 for i in range(len(s)): if p[j] == d[i]: j += 1 if j == len(p): left = mid break if j != len(p): right = mid print (left) ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Little Nastya has a hobby, she likes to remove some letters from word, to obtain another word. But it turns out to be pretty hard for her, because she is too young. Therefore, her brother Sergey always helps her. Sergey gives Nastya the word t and wants to get the word p out of it. Nastya removes letters in a certain order (one after another, in this order strictly), which is specified by permutation of letters' indices of the word t: a1... a|t|. We denote the length of word x as |x|. Note that after removing one letter, the indices of other letters don't change. For example, if t = "nastya" and a = [4, 1, 5, 3, 2, 6] then removals make the following sequence of words "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya". Sergey knows this permutation. His goal is to stop his sister at some point and continue removing by himself to get the word p. Since Nastya likes this activity, Sergey wants to stop her as late as possible. Your task is to determine, how many letters Nastya can remove before she will be stopped by Sergey. It is guaranteed that the word p can be obtained by removing the letters from word t. Input The first and second lines of the input contain the words t and p, respectively. Words are composed of lowercase letters of the Latin alphabet (1 ≤ |p| < |t| ≤ 200 000). It is guaranteed that the word p can be obtained by removing the letters from word t. Next line contains a permutation a1, a2, ..., a|t| of letter indices that specifies the order in which Nastya removes letters of t (1 ≤ ai ≤ |t|, all ai are distinct). Output Print a single integer number, the maximum number of letters that Nastya can remove. Examples Input ababcba abb 5 3 4 1 7 6 2 Output 3 Input bbbabb bb 1 6 3 4 2 5 Output 4 Note In the first sample test sequence of removing made by Nastya looks like this: "ababcba" <image> "ababcba" <image> "ababcba" <image> "ababcba" Nastya can not continue, because it is impossible to get word "abb" from word "ababcba". So, Nastya will remove only three letters. Tags: binary search, greedy, strings Correct Solution: ``` """ NTC here """ import sys inp = sys.stdin.readline def input(): return inp().strip() # flush= sys.stdout.flush # import threading # sys.setrecursionlimit(10**6) # threading.stack_size(2**26) def iin(): return int(input()) def lin(): return list(map(int, input().split())) def main(): p, t = input(), input() a = lin() n = len(p) def check(x): rm = set(a[:x]) #print(rm) p1 = [p[i] for i in range(n) if i+1 not in rm] #print(p1, t) dc = {} for i, j in enumerate(p1): try: dc[j].append(i) except: dc[j] = [i] for i in dc: dc[i] = dc[i][::-1] pv = -1 for i in t: if i in dc: while dc[i]: ch = dc[i].pop() if ch > pv: pv = ch break else: return False else: return False return True ans = 0 left, right = 0, n-1 while left < right: #print(left, right) md = (left+right+1) >> 1 if check(md): #print("SOL - ", md) ans = max(md, ans) left = md else: #print('wrong ', md) right = md - 1 print(ans) main() # threading.Thread(target=main).start() ```
21,667
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Little Nastya has a hobby, she likes to remove some letters from word, to obtain another word. But it turns out to be pretty hard for her, because she is too young. Therefore, her brother Sergey always helps her. Sergey gives Nastya the word t and wants to get the word p out of it. Nastya removes letters in a certain order (one after another, in this order strictly), which is specified by permutation of letters' indices of the word t: a1... a|t|. We denote the length of word x as |x|. Note that after removing one letter, the indices of other letters don't change. For example, if t = "nastya" and a = [4, 1, 5, 3, 2, 6] then removals make the following sequence of words "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya". Sergey knows this permutation. His goal is to stop his sister at some point and continue removing by himself to get the word p. Since Nastya likes this activity, Sergey wants to stop her as late as possible. Your task is to determine, how many letters Nastya can remove before she will be stopped by Sergey. It is guaranteed that the word p can be obtained by removing the letters from word t. Input The first and second lines of the input contain the words t and p, respectively. Words are composed of lowercase letters of the Latin alphabet (1 ≤ |p| < |t| ≤ 200 000). It is guaranteed that the word p can be obtained by removing the letters from word t. Next line contains a permutation a1, a2, ..., a|t| of letter indices that specifies the order in which Nastya removes letters of t (1 ≤ ai ≤ |t|, all ai are distinct). Output Print a single integer number, the maximum number of letters that Nastya can remove. Examples Input ababcba abb 5 3 4 1 7 6 2 Output 3 Input bbbabb bb 1 6 3 4 2 5 Output 4 Note In the first sample test sequence of removing made by Nastya looks like this: "ababcba" <image> "ababcba" <image> "ababcba" <image> "ababcba" Nastya can not continue, because it is impossible to get word "abb" from word "ababcba". So, Nastya will remove only three letters. Tags: binary search, greedy, strings Correct Solution: ``` from sys import stdin t = input().strip() p = input().strip() def possible(pos): it = 0 ip = 0 while it < len(t) and ip < len(p): if it in d: it += 1 continue if t[it] == p[ip]: it += 1 ip += 1 else: it += 1 if ip == len(p): return True else: return False a = [int(x)-1 for x in stdin.readline().split()] l = 0 r = len(t) - len(p) d = set() while l < r: mid = (l + r) // 2 if len(d) < (mid + 1): for i in range(len(d), mid + 1): d.add(a[i]) else: for i in range(mid + 1, len(d), 1): d.discard(a[i]) if possible(mid): l = mid + 1 else: r = mid print(l) ```
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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. Little Nastya has a hobby, she likes to remove some letters from word, to obtain another word. But it turns out to be pretty hard for her, because she is too young. Therefore, her brother Sergey always helps her. Sergey gives Nastya the word t and wants to get the word p out of it. Nastya removes letters in a certain order (one after another, in this order strictly), which is specified by permutation of letters' indices of the word t: a1... a|t|. We denote the length of word x as |x|. Note that after removing one letter, the indices of other letters don't change. For example, if t = "nastya" and a = [4, 1, 5, 3, 2, 6] then removals make the following sequence of words "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya". Sergey knows this permutation. His goal is to stop his sister at some point and continue removing by himself to get the word p. Since Nastya likes this activity, Sergey wants to stop her as late as possible. Your task is to determine, how many letters Nastya can remove before she will be stopped by Sergey. It is guaranteed that the word p can be obtained by removing the letters from word t. Input The first and second lines of the input contain the words t and p, respectively. Words are composed of lowercase letters of the Latin alphabet (1 ≤ |p| < |t| ≤ 200 000). It is guaranteed that the word p can be obtained by removing the letters from word t. Next line contains a permutation a1, a2, ..., a|t| of letter indices that specifies the order in which Nastya removes letters of t (1 ≤ ai ≤ |t|, all ai are distinct). Output Print a single integer number, the maximum number of letters that Nastya can remove. Examples Input ababcba abb 5 3 4 1 7 6 2 Output 3 Input bbbabb bb 1 6 3 4 2 5 Output 4 Note In the first sample test sequence of removing made by Nastya looks like this: "ababcba" <image> "ababcba" <image> "ababcba" <image> "ababcba" Nastya can not continue, because it is impossible to get word "abb" from word "ababcba". So, Nastya will remove only three letters. Submitted Solution: ``` #from bisect import bisect_left as bl #c++ lowerbound bl(array,element) #from bisect import bisect_right as br #c++ upperbound br(array,element) #from __future__ import print_function, division #while using python2 def modinv(n,p): return pow(n,p-2,p) def is_present(parent, child): m = 0 i = 0 j = 0 lc = len(child) lp = len(parent) while i < len(child) and j < len(parent): while i < lc and j < lp and child[i] == parent[j]: i += 1 j += 1 m += 1 while i < lc and j < lp and parent[j] != child[i]: j += 1 return m == len(child) def main(): #sys.stdin = open('input.txt', 'r') #sys.stdout = open('output.txt', 'w') t = input() p = input() moves = [int(x) for x in input().split()] l = 0 r = len(moves) - 1 ans_s = [] while r > l: m = (r+l)//2 removed = set(moves[:m+1]) # print(l, r, m) # print(removed) # input() new_s = [] for i in range(len(t)): if i+1 not in removed: new_s.append(t[i]) if is_present(new_s, p): ans_s = new_s l = m+1 else: r = m if(is_present(ans_s, p)): print(len(t) - len(ans_s)) else: print(0) #------------------ Python 2 and 3 footer by Pajenegod and c1729----------------------------------------- py2 = round(0.5) if py2: from future_builtins import ascii, filter, hex, map, oct, zip range = xrange import os, sys from io import IOBase, BytesIO BUFSIZE = 8192 class FastIO(BytesIO): newlines = 0 def __init__(self, file): self._file = file self._fd = file.fileno() self.writable = "x" in file.mode or "w" in file.mode self.write = super(FastIO, self).write if self.writable else None def _fill(self): s = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE)) self.seek((self.tell(), self.seek(0,2), super(FastIO, self).write(s))[0]) return s def read(self): while self._fill(): pass return super(FastIO,self).read() def readline(self): while self.newlines == 0: s = self._fill(); self.newlines = s.count(b"\n") + (not s) self.newlines -= 1 return super(FastIO, self).readline() def flush(self): if self.writable: os.write(self._fd, self.getvalue()) self.truncate(0), self.seek(0) class IOWrapper(IOBase): def __init__(self, file): self.buffer = FastIO(file) self.flush = self.buffer.flush self.writable = self.buffer.writable if py2: self.write = self.buffer.write self.read = self.buffer.read self.readline = self.buffer.readline else: 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') if __name__ == '__main__': main() ``` Yes
21,669
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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. Little Nastya has a hobby, she likes to remove some letters from word, to obtain another word. But it turns out to be pretty hard for her, because she is too young. Therefore, her brother Sergey always helps her. Sergey gives Nastya the word t and wants to get the word p out of it. Nastya removes letters in a certain order (one after another, in this order strictly), which is specified by permutation of letters' indices of the word t: a1... a|t|. We denote the length of word x as |x|. Note that after removing one letter, the indices of other letters don't change. For example, if t = "nastya" and a = [4, 1, 5, 3, 2, 6] then removals make the following sequence of words "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya". Sergey knows this permutation. His goal is to stop his sister at some point and continue removing by himself to get the word p. Since Nastya likes this activity, Sergey wants to stop her as late as possible. Your task is to determine, how many letters Nastya can remove before she will be stopped by Sergey. It is guaranteed that the word p can be obtained by removing the letters from word t. Input The first and second lines of the input contain the words t and p, respectively. Words are composed of lowercase letters of the Latin alphabet (1 ≤ |p| < |t| ≤ 200 000). It is guaranteed that the word p can be obtained by removing the letters from word t. Next line contains a permutation a1, a2, ..., a|t| of letter indices that specifies the order in which Nastya removes letters of t (1 ≤ ai ≤ |t|, all ai are distinct). Output Print a single integer number, the maximum number of letters that Nastya can remove. Examples Input ababcba abb 5 3 4 1 7 6 2 Output 3 Input bbbabb bb 1 6 3 4 2 5 Output 4 Note In the first sample test sequence of removing made by Nastya looks like this: "ababcba" <image> "ababcba" <image> "ababcba" <image> "ababcba" Nastya can not continue, because it is impossible to get word "abb" from word "ababcba". So, Nastya will remove only three letters. Submitted Solution: ``` a=input() b=input() c=[i-1 for i in list(map(int,input().split()))] l=0 r=len(a) while r-l>1 : m=l+(r-l)//2#two pointer d=list(a) j=0 for o in range(m):#first half delete value replace with "" d[c[o]]="" for i in range(int(len(a))): if(d[i]==b[j]): j+=1 if(j==len(b)): l=m break if(j!=len(b)):r=m print(l) ``` Yes
21,670
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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. Little Nastya has a hobby, she likes to remove some letters from word, to obtain another word. But it turns out to be pretty hard for her, because she is too young. Therefore, her brother Sergey always helps her. Sergey gives Nastya the word t and wants to get the word p out of it. Nastya removes letters in a certain order (one after another, in this order strictly), which is specified by permutation of letters' indices of the word t: a1... a|t|. We denote the length of word x as |x|. Note that after removing one letter, the indices of other letters don't change. For example, if t = "nastya" and a = [4, 1, 5, 3, 2, 6] then removals make the following sequence of words "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya". Sergey knows this permutation. His goal is to stop his sister at some point and continue removing by himself to get the word p. Since Nastya likes this activity, Sergey wants to stop her as late as possible. Your task is to determine, how many letters Nastya can remove before she will be stopped by Sergey. It is guaranteed that the word p can be obtained by removing the letters from word t. Input The first and second lines of the input contain the words t and p, respectively. Words are composed of lowercase letters of the Latin alphabet (1 ≤ |p| < |t| ≤ 200 000). It is guaranteed that the word p can be obtained by removing the letters from word t. Next line contains a permutation a1, a2, ..., a|t| of letter indices that specifies the order in which Nastya removes letters of t (1 ≤ ai ≤ |t|, all ai are distinct). Output Print a single integer number, the maximum number of letters that Nastya can remove. Examples Input ababcba abb 5 3 4 1 7 6 2 Output 3 Input bbbabb bb 1 6 3 4 2 5 Output 4 Note In the first sample test sequence of removing made by Nastya looks like this: "ababcba" <image> "ababcba" <image> "ababcba" <image> "ababcba" Nastya can not continue, because it is impossible to get word "abb" from word "ababcba". So, Nastya will remove only three letters. 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=1000000007 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 sub(x): have=set(a[:x]) i=0 j=0 while(i<len(s) and j<len(t)): if(i+1 not in have and s[i]==t[j]): j+=1 i+=1 return j==len(t) s=input() t=input() a=array() low=0 high=len(a) # print(sub(3)) while(low<=high): mid=low+(high-low)//2 if(sub(mid)): ans=mid low=mid+1 else: high=mid-1 print(ans) ``` Yes
21,671
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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. Little Nastya has a hobby, she likes to remove some letters from word, to obtain another word. But it turns out to be pretty hard for her, because she is too young. Therefore, her brother Sergey always helps her. Sergey gives Nastya the word t and wants to get the word p out of it. Nastya removes letters in a certain order (one after another, in this order strictly), which is specified by permutation of letters' indices of the word t: a1... a|t|. We denote the length of word x as |x|. Note that after removing one letter, the indices of other letters don't change. For example, if t = "nastya" and a = [4, 1, 5, 3, 2, 6] then removals make the following sequence of words "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya". Sergey knows this permutation. His goal is to stop his sister at some point and continue removing by himself to get the word p. Since Nastya likes this activity, Sergey wants to stop her as late as possible. Your task is to determine, how many letters Nastya can remove before she will be stopped by Sergey. It is guaranteed that the word p can be obtained by removing the letters from word t. Input The first and second lines of the input contain the words t and p, respectively. Words are composed of lowercase letters of the Latin alphabet (1 ≤ |p| < |t| ≤ 200 000). It is guaranteed that the word p can be obtained by removing the letters from word t. Next line contains a permutation a1, a2, ..., a|t| of letter indices that specifies the order in which Nastya removes letters of t (1 ≤ ai ≤ |t|, all ai are distinct). Output Print a single integer number, the maximum number of letters that Nastya can remove. Examples Input ababcba abb 5 3 4 1 7 6 2 Output 3 Input bbbabb bb 1 6 3 4 2 5 Output 4 Note In the first sample test sequence of removing made by Nastya looks like this: "ababcba" <image> "ababcba" <image> "ababcba" <image> "ababcba" Nastya can not continue, because it is impossible to get word "abb" from word "ababcba". So, Nastya will remove only three letters. Submitted Solution: ``` def binaryFind(): c = [0]*lenp maxlen = 0 for i in range(0,mid): c[a[i]-1]=1 for i in range(0,lenp): if c[i]==0: if p[i]==t[maxlen]: maxlen+=1 if maxlen==lent: return True return False p = input() t = input() a = list(map(int,input().split())) lenp = len(p) lent = len(t) l=0 r=lenp while l<=r: mid = (l+r)//2 isok = binaryFind() if isok==True: l = mid+1 else : r = mid-1 print(l-1) ``` Yes
21,672
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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. Little Nastya has a hobby, she likes to remove some letters from word, to obtain another word. But it turns out to be pretty hard for her, because she is too young. Therefore, her brother Sergey always helps her. Sergey gives Nastya the word t and wants to get the word p out of it. Nastya removes letters in a certain order (one after another, in this order strictly), which is specified by permutation of letters' indices of the word t: a1... a|t|. We denote the length of word x as |x|. Note that after removing one letter, the indices of other letters don't change. For example, if t = "nastya" and a = [4, 1, 5, 3, 2, 6] then removals make the following sequence of words "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya". Sergey knows this permutation. His goal is to stop his sister at some point and continue removing by himself to get the word p. Since Nastya likes this activity, Sergey wants to stop her as late as possible. Your task is to determine, how many letters Nastya can remove before she will be stopped by Sergey. It is guaranteed that the word p can be obtained by removing the letters from word t. Input The first and second lines of the input contain the words t and p, respectively. Words are composed of lowercase letters of the Latin alphabet (1 ≤ |p| < |t| ≤ 200 000). It is guaranteed that the word p can be obtained by removing the letters from word t. Next line contains a permutation a1, a2, ..., a|t| of letter indices that specifies the order in which Nastya removes letters of t (1 ≤ ai ≤ |t|, all ai are distinct). Output Print a single integer number, the maximum number of letters that Nastya can remove. Examples Input ababcba abb 5 3 4 1 7 6 2 Output 3 Input bbbabb bb 1 6 3 4 2 5 Output 4 Note In the first sample test sequence of removing made by Nastya looks like this: "ababcba" <image> "ababcba" <image> "ababcba" <image> "ababcba" Nastya can not continue, because it is impossible to get word "abb" from word "ababcba". So, Nastya will remove only three letters. Submitted Solution: ``` #!/usr/bin/env python3 from sys import stdin,stdout import re import bisect bisect def ri(): return map(int, input().split()) t = input() p = input() a = list(ri()) p = ".*".join(p) ptrn = re.compile(p) tt = list(t[:]) tt[a[0]] = '' if not ptrn.search("".join(tt)): print(0) exit() s = 0 e = len(a)-1 while True: m = s + (e-s)//2 ii = [0]*len(t) tt = [] for i in range(m+1): ii[a[i]-1] = 1 for i in range(len(t)): if ii[i] == 0: tt.append(t[i]) if ptrn.search("".join(tt)): s = m else: e = m if e-s == 1: print(s+1) exit() ``` No
21,673
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Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. Little Nastya has a hobby, she likes to remove some letters from word, to obtain another word. But it turns out to be pretty hard for her, because she is too young. Therefore, her brother Sergey always helps her. Sergey gives Nastya the word t and wants to get the word p out of it. Nastya removes letters in a certain order (one after another, in this order strictly), which is specified by permutation of letters' indices of the word t: a1... a|t|. We denote the length of word x as |x|. Note that after removing one letter, the indices of other letters don't change. For example, if t = "nastya" and a = [4, 1, 5, 3, 2, 6] then removals make the following sequence of words "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya". Sergey knows this permutation. His goal is to stop his sister at some point and continue removing by himself to get the word p. Since Nastya likes this activity, Sergey wants to stop her as late as possible. Your task is to determine, how many letters Nastya can remove before she will be stopped by Sergey. It is guaranteed that the word p can be obtained by removing the letters from word t. Input The first and second lines of the input contain the words t and p, respectively. Words are composed of lowercase letters of the Latin alphabet (1 ≤ |p| < |t| ≤ 200 000). It is guaranteed that the word p can be obtained by removing the letters from word t. Next line contains a permutation a1, a2, ..., a|t| of letter indices that specifies the order in which Nastya removes letters of t (1 ≤ ai ≤ |t|, all ai are distinct). Output Print a single integer number, the maximum number of letters that Nastya can remove. Examples Input ababcba abb 5 3 4 1 7 6 2 Output 3 Input bbbabb bb 1 6 3 4 2 5 Output 4 Note In the first sample test sequence of removing made by Nastya looks like this: "ababcba" <image> "ababcba" <image> "ababcba" <image> "ababcba" Nastya can not continue, because it is impossible to get word "abb" from word "ababcba". So, Nastya will remove only three letters. Submitted Solution: ``` def mi(): return map(int, input().split()) s = list(input()) t = input() a = list(map(int, input().split())) def isSubSequence(str1,str2,m,n): j = 0 # Index of str1 i = 0 # Index of str2 # Traverse both str1 and str2 # Compare current character of str2 with # first unmatched character of str1 # If matched, then move ahead in str1 while j<m and i<n: if str1[j] == str2[i]: j = j+1 i = i + 1 # If all characters of str1 matched, then j is equal to m return j==m l = len(a) high = l low = 0 bestans = -1 while low<high: mid = (low+high)//2 b = a.copy() s1 = s.copy() for i in range(mid): s1[b[i]-1] = '' s1 = ''.join(s1) if isSubSequence(t,s1,len(t),len(s1)): low = mid+1 bestans = max(bestans,mid) else: high = mid-1 print (bestans) ``` No
21,674
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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. Little Nastya has a hobby, she likes to remove some letters from word, to obtain another word. But it turns out to be pretty hard for her, because she is too young. Therefore, her brother Sergey always helps her. Sergey gives Nastya the word t and wants to get the word p out of it. Nastya removes letters in a certain order (one after another, in this order strictly), which is specified by permutation of letters' indices of the word t: a1... a|t|. We denote the length of word x as |x|. Note that after removing one letter, the indices of other letters don't change. For example, if t = "nastya" and a = [4, 1, 5, 3, 2, 6] then removals make the following sequence of words "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya". Sergey knows this permutation. His goal is to stop his sister at some point and continue removing by himself to get the word p. Since Nastya likes this activity, Sergey wants to stop her as late as possible. Your task is to determine, how many letters Nastya can remove before she will be stopped by Sergey. It is guaranteed that the word p can be obtained by removing the letters from word t. Input The first and second lines of the input contain the words t and p, respectively. Words are composed of lowercase letters of the Latin alphabet (1 ≤ |p| < |t| ≤ 200 000). It is guaranteed that the word p can be obtained by removing the letters from word t. Next line contains a permutation a1, a2, ..., a|t| of letter indices that specifies the order in which Nastya removes letters of t (1 ≤ ai ≤ |t|, all ai are distinct). Output Print a single integer number, the maximum number of letters that Nastya can remove. Examples Input ababcba abb 5 3 4 1 7 6 2 Output 3 Input bbbabb bb 1 6 3 4 2 5 Output 4 Note In the first sample test sequence of removing made by Nastya looks like this: "ababcba" <image> "ababcba" <image> "ababcba" <image> "ababcba" Nastya can not continue, because it is impossible to get word "abb" from word "ababcba". So, Nastya will remove only three letters. Submitted Solution: ``` #!/usr/bin/env python3 from sys import stdin,stdout import re import bisect bisect def ri(): return map(int, input().split()) t = input() p = input() a = list(ri()) p = ".*".join(p) ptrn = re.compile(p) tt = list(t[:]) tt[a[0]] = '' if not ptrn.search("".join(tt)): print("come here") print(0) exit() s = 0 e = len(a)-1 while True: m = s + (e-s)//2 ii = [0]*len(t) tt = [] for i in range(m+1): ii[a[i]-1] = 1 for i in range(len(t)): if ii[i] == 0: tt.append(t[i]) if ptrn.search("".join(tt)): s = m else: e = m if e-s == 1: print(s+1) exit() ``` No
21,675
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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. Little Nastya has a hobby, she likes to remove some letters from word, to obtain another word. But it turns out to be pretty hard for her, because she is too young. Therefore, her brother Sergey always helps her. Sergey gives Nastya the word t and wants to get the word p out of it. Nastya removes letters in a certain order (one after another, in this order strictly), which is specified by permutation of letters' indices of the word t: a1... a|t|. We denote the length of word x as |x|. Note that after removing one letter, the indices of other letters don't change. For example, if t = "nastya" and a = [4, 1, 5, 3, 2, 6] then removals make the following sequence of words "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya" <image> "nastya". Sergey knows this permutation. His goal is to stop his sister at some point and continue removing by himself to get the word p. Since Nastya likes this activity, Sergey wants to stop her as late as possible. Your task is to determine, how many letters Nastya can remove before she will be stopped by Sergey. It is guaranteed that the word p can be obtained by removing the letters from word t. Input The first and second lines of the input contain the words t and p, respectively. Words are composed of lowercase letters of the Latin alphabet (1 ≤ |p| < |t| ≤ 200 000). It is guaranteed that the word p can be obtained by removing the letters from word t. Next line contains a permutation a1, a2, ..., a|t| of letter indices that specifies the order in which Nastya removes letters of t (1 ≤ ai ≤ |t|, all ai are distinct). Output Print a single integer number, the maximum number of letters that Nastya can remove. Examples Input ababcba abb 5 3 4 1 7 6 2 Output 3 Input bbbabb bb 1 6 3 4 2 5 Output 4 Note In the first sample test sequence of removing made by Nastya looks like this: "ababcba" <image> "ababcba" <image> "ababcba" <image> "ababcba" Nastya can not continue, because it is impossible to get word "abb" from word "ababcba". So, Nastya will remove only three letters. Submitted Solution: ``` def mi(): return map(int, input().split()) s = list(input()) t = input() a = list(map(int, input().split())) def isSubSequence(str1,str2,m,n): j = 0 # Index of str1 i = 0 # Index of str2 # Traverse both str1 and str2 # Compare current character of str2 with # first unmatched character of str1 # If matched, then move ahead in str1 while j<m and i<n: if str1[j] == str2[i]: j = j+1 i = i + 1 # If all characters of str1 matched, then j is equal to m return j==m l = len(a) high = l low = 0 bestans = -1 while low<high: mid = (low+high)//2 b = a.copy() s1 = s.copy() for i in range(mid): s1[b[i]-1] = '' s1 = ''.join(s1) if s1.find(t)>-1: low = mid+1 bestans = max(bestans,mid) else: if isSubSequence(t,s1,len(t),len(s1)): low = mid+1 else: high = mid print (bestans) ``` No
21,676
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Provide tags and a correct Python 3 solution for this coding contest problem. What are you doing at the end of the world? Are you busy? Will you save us? <image> Nephren is playing a game with little leprechauns. She gives them an infinite array of strings, f0... ∞. f0 is "What are you doing at the end of the world? Are you busy? Will you save us?". She wants to let more people know about it, so she defines fi = "What are you doing while sending "fi - 1"? Are you busy? Will you send "fi - 1"?" for all i ≥ 1. For example, f1 is "What are you doing while sending "What are you doing at the end of the world? Are you busy? Will you save us?"? Are you busy? Will you send "What are you doing at the end of the world? Are you busy? Will you save us?"?". Note that the quotes in the very beginning and in the very end are for clarity and are not a part of f1. It can be seen that the characters in fi are letters, question marks, (possibly) quotation marks and spaces. Nephren will ask the little leprechauns q times. Each time she will let them find the k-th character of fn. The characters are indexed starting from 1. If fn consists of less than k characters, output '.' (without quotes). Can you answer her queries? Input The first line contains one integer q (1 ≤ q ≤ 10) — the number of Nephren's questions. Each of the next q lines describes Nephren's question and contains two integers n and k (0 ≤ n ≤ 105, 1 ≤ k ≤ 1018). Output One line containing q characters. The i-th character in it should be the answer for the i-th query. Examples Input 3 1 1 1 2 1 111111111111 Output Wh. Input 5 0 69 1 194 1 139 0 47 1 66 Output abdef Input 10 4 1825 3 75 3 530 4 1829 4 1651 3 187 4 584 4 255 4 774 2 474 Output Areyoubusy Note For the first two examples, refer to f0 and f1 given in the legend. Tags: binary search, dfs and similar Correct Solution: ``` f0 = "What are you doing at the end of the world? Are you busy? Will you save us?" f1 = "What are you doing while sending \"{0}\"? Are you busy? Will you send \"{0}\"?" a = list(f1.split("{0}")) b = list(map(len, a)) q = int(input()) f = lambda n: 143 * 2**min(n, 54) - 68 for _ in range(q): n, k = map(int, input().split()) ans = "" while n > 0 and b[0] < k < b[0] + f(n-1): k -= b[0] n -= 1 while not ans: w = f(n-1) if k > f(n): ans = "." elif n == 0: ans = f0[k-1] elif k <= b[0]: ans = a[0][k-1] elif k <= b[0] + w: k -= b[0] n -= 1 elif k <= b[0] + w + b[1]: k -= b[0] + w ans = a[1][k-1] elif k <= b[0] + w + b[1] + w: k -= b[0] + w + b[1] n -= 1 else: k -= b[0] + w + b[1] + w ans = a[2][k-1] print(ans, end="") ```
21,705
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6
Provide tags and a correct Python 3 solution for this coding contest problem. What are you doing at the end of the world? Are you busy? Will you save us? <image> Nephren is playing a game with little leprechauns. She gives them an infinite array of strings, f0... ∞. f0 is "What are you doing at the end of the world? Are you busy? Will you save us?". She wants to let more people know about it, so she defines fi = "What are you doing while sending "fi - 1"? Are you busy? Will you send "fi - 1"?" for all i ≥ 1. For example, f1 is "What are you doing while sending "What are you doing at the end of the world? Are you busy? Will you save us?"? Are you busy? Will you send "What are you doing at the end of the world? Are you busy? Will you save us?"?". Note that the quotes in the very beginning and in the very end are for clarity and are not a part of f1. It can be seen that the characters in fi are letters, question marks, (possibly) quotation marks and spaces. Nephren will ask the little leprechauns q times. Each time she will let them find the k-th character of fn. The characters are indexed starting from 1. If fn consists of less than k characters, output '.' (without quotes). Can you answer her queries? Input The first line contains one integer q (1 ≤ q ≤ 10) — the number of Nephren's questions. Each of the next q lines describes Nephren's question and contains two integers n and k (0 ≤ n ≤ 105, 1 ≤ k ≤ 1018). Output One line containing q characters. The i-th character in it should be the answer for the i-th query. Examples Input 3 1 1 1 2 1 111111111111 Output Wh. Input 5 0 69 1 194 1 139 0 47 1 66 Output abdef Input 10 4 1825 3 75 3 530 4 1829 4 1651 3 187 4 584 4 255 4 774 2 474 Output Areyoubusy Note For the first two examples, refer to f0 and f1 given in the legend. Tags: binary search, dfs and similar Correct Solution: ``` s0 = 'What are you doing at the end of the world? Are you busy? Will you save us?' s1 = 'What are you doing while sending "' s2 = '"? Are you busy? Will you send "' l0 = len(s0) l1 = len(s1) l2 = len(s2) def get(h): if h > 55: return 10**20 return (l0 + l1 + l2 + 2 << h) - l1 - l2 - 2 def solve(n, k): if get(n) <= k: return '.' while True: if n == 0: return s0[k] if k < l1: return s1[k] k -= l1 if k < get(n-1): n -= 1 continue k -= get(n-1) if k < l2: return s2[k] k -= l2 if k < get(n-1): n -=1 else: return '"?'[k - get(n - 1)] q = int(input()) for i in range(q): n,k=list(map(int,input().split())) print(solve(n,k-1),end='') ```
21,706
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6
Provide tags and a correct Python 3 solution for this coding contest problem. What are you doing at the end of the world? Are you busy? Will you save us? <image> Nephren is playing a game with little leprechauns. She gives them an infinite array of strings, f0... ∞. f0 is "What are you doing at the end of the world? Are you busy? Will you save us?". She wants to let more people know about it, so she defines fi = "What are you doing while sending "fi - 1"? Are you busy? Will you send "fi - 1"?" for all i ≥ 1. For example, f1 is "What are you doing while sending "What are you doing at the end of the world? Are you busy? Will you save us?"? Are you busy? Will you send "What are you doing at the end of the world? Are you busy? Will you save us?"?". Note that the quotes in the very beginning and in the very end are for clarity and are not a part of f1. It can be seen that the characters in fi are letters, question marks, (possibly) quotation marks and spaces. Nephren will ask the little leprechauns q times. Each time she will let them find the k-th character of fn. The characters are indexed starting from 1. If fn consists of less than k characters, output '.' (without quotes). Can you answer her queries? Input The first line contains one integer q (1 ≤ q ≤ 10) — the number of Nephren's questions. Each of the next q lines describes Nephren's question and contains two integers n and k (0 ≤ n ≤ 105, 1 ≤ k ≤ 1018). Output One line containing q characters. The i-th character in it should be the answer for the i-th query. Examples Input 3 1 1 1 2 1 111111111111 Output Wh. Input 5 0 69 1 194 1 139 0 47 1 66 Output abdef Input 10 4 1825 3 75 3 530 4 1829 4 1651 3 187 4 584 4 255 4 774 2 474 Output Areyoubusy Note For the first two examples, refer to f0 and f1 given in the legend. Tags: binary search, dfs and similar Correct Solution: ``` import sys sys.setrecursionlimit(1500) s1 = "What are you doing at the end of the world? Are you busy? Will you save us?" a = "What are you doing while sending \"" b = "\"? Are you busy? Will you send \"" c = "\"?" ans = "" def solve(n, k): if n == 0: if k >= len(s1): return "." else: return s1[k] if k < len(a): return a[k] k -= len(a) prev_len = (2 ** (n - 1) - 1) * (len(a) + len(b) + len(c)) + (2 ** (n - 1)) * len(s1) if k < prev_len: return solve(n - 1, k) k -= prev_len if k < len(b): return b[k] k -= len(b) if k < prev_len: return solve(n - 1, k) k -= prev_len if k < len(c): return c[k] else: return "." for _ in range(int(input())): n, k = list(map(int, input().split())) k -= 1 if n > 65: m = n - 65 if k < len(a) * m: ans += a[k % len(a)] continue k -= len(a) * m n = n - m ans += solve(n, k) print(ans) ```
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Provide tags and a correct Python 3 solution for this coding contest problem. What are you doing at the end of the world? Are you busy? Will you save us? <image> Nephren is playing a game with little leprechauns. She gives them an infinite array of strings, f0... ∞. f0 is "What are you doing at the end of the world? Are you busy? Will you save us?". She wants to let more people know about it, so she defines fi = "What are you doing while sending "fi - 1"? Are you busy? Will you send "fi - 1"?" for all i ≥ 1. For example, f1 is "What are you doing while sending "What are you doing at the end of the world? Are you busy? Will you save us?"? Are you busy? Will you send "What are you doing at the end of the world? Are you busy? Will you save us?"?". Note that the quotes in the very beginning and in the very end are for clarity and are not a part of f1. It can be seen that the characters in fi are letters, question marks, (possibly) quotation marks and spaces. Nephren will ask the little leprechauns q times. Each time she will let them find the k-th character of fn. The characters are indexed starting from 1. If fn consists of less than k characters, output '.' (without quotes). Can you answer her queries? Input The first line contains one integer q (1 ≤ q ≤ 10) — the number of Nephren's questions. Each of the next q lines describes Nephren's question and contains two integers n and k (0 ≤ n ≤ 105, 1 ≤ k ≤ 1018). Output One line containing q characters. The i-th character in it should be the answer for the i-th query. Examples Input 3 1 1 1 2 1 111111111111 Output Wh. Input 5 0 69 1 194 1 139 0 47 1 66 Output abdef Input 10 4 1825 3 75 3 530 4 1829 4 1651 3 187 4 584 4 255 4 774 2 474 Output Areyoubusy Note For the first two examples, refer to f0 and f1 given in the legend. Tags: binary search, dfs and similar Correct Solution: ``` def get_len(ind): if ind > 63: ind = 63 k = (1 << ind) - 1 return k * (len1 + len2 + len3) + (k + 1) * len_f0 f0 = 'What are you doing at the end of the world? Are you busy? Will you save us?' s1 = 'What are you doing while sending "' s2 = '"? Are you busy? Will you send "' s3 = '"?' len_f0 = len(f0) len1 = len(s1) len2 = len(s2) len3 = len(s3) q = int(input()) for i in range(q): n, k = map(int, input().split()) k -= 1 l = 0; ind = n - 1 while True: if k < l + len_f0 and ind == -1: print(f0[k - l], end='') break elif k < l + len1: print(s1[k - l], end='') break elif ind >= 0 and k < l + len1 + get_len(ind): l += len1 ind = ind - 1 elif ind >= 0 and k < l + len1 + get_len(ind) + len2: print(s2[k - l - len1 - get_len(ind)], end='') break elif ind >= 0 and k < l + len1 + get_len(ind) + len2 + get_len(ind): l += len1 + get_len(ind) + len2 ind = ind - 1 elif ind >= 0 and k < l + len1 + get_len(ind) + len2 + get_len(ind) + len3: print(s3[k - l - len1 - get_len(ind) - len2 - get_len(ind)], end='') break else: print('.', end='') break ```
21,708
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6
Provide tags and a correct Python 3 solution for this coding contest problem. What are you doing at the end of the world? Are you busy? Will you save us? <image> Nephren is playing a game with little leprechauns. She gives them an infinite array of strings, f0... ∞. f0 is "What are you doing at the end of the world? Are you busy? Will you save us?". She wants to let more people know about it, so she defines fi = "What are you doing while sending "fi - 1"? Are you busy? Will you send "fi - 1"?" for all i ≥ 1. For example, f1 is "What are you doing while sending "What are you doing at the end of the world? Are you busy? Will you save us?"? Are you busy? Will you send "What are you doing at the end of the world? Are you busy? Will you save us?"?". Note that the quotes in the very beginning and in the very end are for clarity and are not a part of f1. It can be seen that the characters in fi are letters, question marks, (possibly) quotation marks and spaces. Nephren will ask the little leprechauns q times. Each time she will let them find the k-th character of fn. The characters are indexed starting from 1. If fn consists of less than k characters, output '.' (without quotes). Can you answer her queries? Input The first line contains one integer q (1 ≤ q ≤ 10) — the number of Nephren's questions. Each of the next q lines describes Nephren's question and contains two integers n and k (0 ≤ n ≤ 105, 1 ≤ k ≤ 1018). Output One line containing q characters. The i-th character in it should be the answer for the i-th query. Examples Input 3 1 1 1 2 1 111111111111 Output Wh. Input 5 0 69 1 194 1 139 0 47 1 66 Output abdef Input 10 4 1825 3 75 3 530 4 1829 4 1651 3 187 4 584 4 255 4 774 2 474 Output Areyoubusy Note For the first two examples, refer to f0 and f1 given in the legend. Tags: binary search, dfs and similar Correct Solution: ``` f0 = "What are you doing at the end of the world? Are you busy? Will you save us?" p1 = "What are you doing while sending \"" p2 = "\"? Are you busy? Will you send \"" p3 = "\"?" f = [] def dfs(n, k): if k > f[n]: return '.' if n == 0: return f0[k-1] if k <= 34: return p1[k-1] if k <= f[n-1] + 34: return dfs(n - 1, k - 34) if k <= f[n-1] + 66: return p2[k - f[n-1] - 34 - 1] if k <= 2 * f[n-1] + 66: return dfs(n - 1, k - f[n-1] - 66) return p3[k - f[n-1] * 2 - 66 - 1] f.append(75) cnt = 0 for i in range(0, 100): f.append(f[cnt] * 2 + 68) cnt += 1 def solve(): n, k =map(int, input().split(' ')) while n > 56 and k > 34: k -= 34 n -= 1 if k <= 34: print(p1[k - 1], end='') else: print(dfs(n, k), end='') def main(): case = 1 case = int(input()) for case in range(case): solve() main() ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. What are you doing at the end of the world? Are you busy? Will you save us? <image> Nephren is playing a game with little leprechauns. She gives them an infinite array of strings, f0... ∞. f0 is "What are you doing at the end of the world? Are you busy? Will you save us?". She wants to let more people know about it, so she defines fi = "What are you doing while sending "fi - 1"? Are you busy? Will you send "fi - 1"?" for all i ≥ 1. For example, f1 is "What are you doing while sending "What are you doing at the end of the world? Are you busy? Will you save us?"? Are you busy? Will you send "What are you doing at the end of the world? Are you busy? Will you save us?"?". Note that the quotes in the very beginning and in the very end are for clarity and are not a part of f1. It can be seen that the characters in fi are letters, question marks, (possibly) quotation marks and spaces. Nephren will ask the little leprechauns q times. Each time she will let them find the k-th character of fn. The characters are indexed starting from 1. If fn consists of less than k characters, output '.' (without quotes). Can you answer her queries? Input The first line contains one integer q (1 ≤ q ≤ 10) — the number of Nephren's questions. Each of the next q lines describes Nephren's question and contains two integers n and k (0 ≤ n ≤ 105, 1 ≤ k ≤ 1018). Output One line containing q characters. The i-th character in it should be the answer for the i-th query. Examples Input 3 1 1 1 2 1 111111111111 Output Wh. Input 5 0 69 1 194 1 139 0 47 1 66 Output abdef Input 10 4 1825 3 75 3 530 4 1829 4 1651 3 187 4 584 4 255 4 774 2 474 Output Areyoubusy Note For the first two examples, refer to f0 and f1 given in the legend. Tags: binary search, dfs and similar Correct Solution: ``` import sys sys.setrecursionlimit(1001000) ants = "What are you doing while sending \"" ant = len(ants) meios = "\"? Are you busy? Will you send \"" meio = len(meios) fims = "\"?" fim = len(fims) base = "What are you doing at the end of the world? Are you busy? Will you save us?" f = [0] f[0] = len(base) for i in range(1,100001): f.append(2*f[i-1] + ant + meio + fim) if(f[i] >= int(1e18) + 10): f[i] = int(1e18) + 10 def busca(n,k): while True: if n == 0: if k > len(base): return "." else: return base[k-1] if k <= ant: return ants[k-1] k -= ant if k <= f[n-1]: n-=1 continue k -= f[n-1] if k <= meio: return meios[k-1] k -= meio if k <= f[n-1]: n -= 1 continue k -= f[n-1] if k <= fim: return fims[k-1] return "." def main(): q = int(input()) for i in range(0,q): n,k = map(int, input().split()) print (busca(n,k), end='') print() main() ```
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Provide tags and a correct Python 3 solution for this coding contest problem. What are you doing at the end of the world? Are you busy? Will you save us? <image> Nephren is playing a game with little leprechauns. She gives them an infinite array of strings, f0... ∞. f0 is "What are you doing at the end of the world? Are you busy? Will you save us?". She wants to let more people know about it, so she defines fi = "What are you doing while sending "fi - 1"? Are you busy? Will you send "fi - 1"?" for all i ≥ 1. For example, f1 is "What are you doing while sending "What are you doing at the end of the world? Are you busy? Will you save us?"? Are you busy? Will you send "What are you doing at the end of the world? Are you busy? Will you save us?"?". Note that the quotes in the very beginning and in the very end are for clarity and are not a part of f1. It can be seen that the characters in fi are letters, question marks, (possibly) quotation marks and spaces. Nephren will ask the little leprechauns q times. Each time she will let them find the k-th character of fn. The characters are indexed starting from 1. If fn consists of less than k characters, output '.' (without quotes). Can you answer her queries? Input The first line contains one integer q (1 ≤ q ≤ 10) — the number of Nephren's questions. Each of the next q lines describes Nephren's question and contains two integers n and k (0 ≤ n ≤ 105, 1 ≤ k ≤ 1018). Output One line containing q characters. The i-th character in it should be the answer for the i-th query. Examples Input 3 1 1 1 2 1 111111111111 Output Wh. Input 5 0 69 1 194 1 139 0 47 1 66 Output abdef Input 10 4 1825 3 75 3 530 4 1829 4 1651 3 187 4 584 4 255 4 774 2 474 Output Areyoubusy Note For the first two examples, refer to f0 and f1 given in the legend. Tags: binary search, dfs and similar Correct Solution: ``` tmp = [""] * 3 tmp[0] = "What are you doing while sending \"" tmp[1] = "\"? Are you busy? Will you send \"" tmp[2] = "\"?" def fun(s): return tmp[0] + s + tmp[1] + s + tmp[2] MAX = 60 f = [""] * 3 f[0] = "What are you doing at the end of the world? Are you busy? Will you save us?" f[1] = fun(f[0]) f[2] = fun(f[1]) l = [0] * (MAX + 1) l[0] = len(f[0]) l[1] = len(f[1]) l[2] = len(f[2]) for i in range(3, MAX + 1): l[i] = l[i - 1] * 2 + 68 def solve(n, k): if n <= MAX and l[n] < k: return "." if n <= 2: return f[n][k - 1] if n > MAX: if k > 34 * (n - MAX): return solve(MAX, k - 34 * (n - MAX)) return tmp[0][(k - 1) % 34] if k <= 34: return tmp[0][k - 1] k -= 34 if k <= l[n - 1]: return solve(n - 1, k) k -= l[n - 1] if k <= 32: return tmp[1][k - 1] k -= 32 if k <= l[n - 1]: return solve(n - 1, k) k -= l[n - 1] return tmp[2][k - 1] q = int(input()) for i in range(q): nn, kk = map(int, input().split()) print(solve(nn, kk), end="") print() ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. What are you doing at the end of the world? Are you busy? Will you save us? <image> Nephren is playing a game with little leprechauns. She gives them an infinite array of strings, f0... ∞. f0 is "What are you doing at the end of the world? Are you busy? Will you save us?". She wants to let more people know about it, so she defines fi = "What are you doing while sending "fi - 1"? Are you busy? Will you send "fi - 1"?" for all i ≥ 1. For example, f1 is "What are you doing while sending "What are you doing at the end of the world? Are you busy? Will you save us?"? Are you busy? Will you send "What are you doing at the end of the world? Are you busy? Will you save us?"?". Note that the quotes in the very beginning and in the very end are for clarity and are not a part of f1. It can be seen that the characters in fi are letters, question marks, (possibly) quotation marks and spaces. Nephren will ask the little leprechauns q times. Each time she will let them find the k-th character of fn. The characters are indexed starting from 1. If fn consists of less than k characters, output '.' (without quotes). Can you answer her queries? Input The first line contains one integer q (1 ≤ q ≤ 10) — the number of Nephren's questions. Each of the next q lines describes Nephren's question and contains two integers n and k (0 ≤ n ≤ 105, 1 ≤ k ≤ 1018). Output One line containing q characters. The i-th character in it should be the answer for the i-th query. Examples Input 3 1 1 1 2 1 111111111111 Output Wh. Input 5 0 69 1 194 1 139 0 47 1 66 Output abdef Input 10 4 1825 3 75 3 530 4 1829 4 1651 3 187 4 584 4 255 4 774 2 474 Output Areyoubusy Note For the first two examples, refer to f0 and f1 given in the legend. Tags: binary search, dfs and similar Correct Solution: ``` s = [ "What are you doing at the end of the world? Are you busy? Will you save us?", "What are you doing while sending \"", "\"? Are you busy? Will you send \"", "\"?" ] l = list(map(len, s)) ls = [l[0]] while ls[-1] <= int(1e18): ls.append(2 * ls[-1] + sum(l[1:])) ans = "" q = int(input()) for _ in range(q): n, k = map(int, input().split()) c = '' while c == '': if n < len(ls) and ls[n] < k: c = '.' elif n == 0: c = s[0][k - 1] elif k <= l[1]: c = s[1][k - 1] elif l[1] < k and (len(ls) <= n or k <= l[1] + ls[n - 1]): k -= l[1] n -= 1 elif l[1] + ls[n - 1] < k <= l[1] + ls[n - 1] + l[2]: c = s[2][k - l[1] - ls[n - 1] - 1] elif l[1] + ls[n - 1] + l[2] < k <= l[1] + ls[n - 1] + l[2] + ls[n - 1]: k -= l[1] + ls[n - 1] + l[2] n -= 1 else: c = s[3][k - ls[n] - 1] ans += c print(ans) ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Petya loves football very much. One day, as he was watching a football match, he was writing the players' current positions on a piece of paper. To simplify the situation he depicted it as a string consisting of zeroes and ones. A zero corresponds to players of one team; a one corresponds to players of another team. If there are at least 7 players of some team standing one after another, then the situation is considered dangerous. For example, the situation 00100110111111101 is dangerous and 11110111011101 is not. You are given the current situation. Determine whether it is dangerous or not. Input The first input line contains a non-empty string consisting of characters "0" and "1", which represents players. The length of the string does not exceed 100 characters. There's at least one player from each team present on the field. Output Print "YES" if the situation is dangerous. Otherwise, print "NO". Examples Input 001001 Output NO Input 1000000001 Output YES Tags: implementation, strings Correct Solution: ``` position=input() if len(position) <=7: print("NO") else: flag=False for i in range(len(position)): if position[i:i+7]=="0000000" or position[i:i+7]=="1111111": flag=True break elif i > len(position)-7: break if flag: print("YES") else: print("NO") ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Petya loves football very much. One day, as he was watching a football match, he was writing the players' current positions on a piece of paper. To simplify the situation he depicted it as a string consisting of zeroes and ones. A zero corresponds to players of one team; a one corresponds to players of another team. If there are at least 7 players of some team standing one after another, then the situation is considered dangerous. For example, the situation 00100110111111101 is dangerous and 11110111011101 is not. You are given the current situation. Determine whether it is dangerous or not. Input The first input line contains a non-empty string consisting of characters "0" and "1", which represents players. The length of the string does not exceed 100 characters. There's at least one player from each team present on the field. Output Print "YES" if the situation is dangerous. Otherwise, print "NO". Examples Input 001001 Output NO Input 1000000001 Output YES Tags: implementation, strings Correct Solution: ``` s=input() pres,prev,c=0,0,0 for i in s: pres=int(i) if pres==prev: c+=1 prev=pres if c==7: print("YES") break else: c=1 prev=pres if c<7: print("NO") ```
21,744
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Petya loves football very much. One day, as he was watching a football match, he was writing the players' current positions on a piece of paper. To simplify the situation he depicted it as a string consisting of zeroes and ones. A zero corresponds to players of one team; a one corresponds to players of another team. If there are at least 7 players of some team standing one after another, then the situation is considered dangerous. For example, the situation 00100110111111101 is dangerous and 11110111011101 is not. You are given the current situation. Determine whether it is dangerous or not. Input The first input line contains a non-empty string consisting of characters "0" and "1", which represents players. The length of the string does not exceed 100 characters. There's at least one player from each team present on the field. Output Print "YES" if the situation is dangerous. Otherwise, print "NO". Examples Input 001001 Output NO Input 1000000001 Output YES Tags: implementation, strings Correct Solution: ``` if __name__ == "__main__": s = list(char for char in input()) l_old=s[0] count_one=0 count_zero=0 yes=False for l in s: if l == l_old: if l=="0": count_zero+=1 count_one=1 #print(f"zeros:{count_zero} ones:{count_one} l:{l} l_old:{l_old}") else: count_zero=1 count_one+=1 #print(f"zeros:{count_zero} ones:{count_one} l:{l} l_old:{l_old}") else: count_zero=1 count_one=1 l_old=l if (count_one==7) or (count_zero==7): yes=True break if yes: print("YES") else: print("NO") ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Petya loves football very much. One day, as he was watching a football match, he was writing the players' current positions on a piece of paper. To simplify the situation he depicted it as a string consisting of zeroes and ones. A zero corresponds to players of one team; a one corresponds to players of another team. If there are at least 7 players of some team standing one after another, then the situation is considered dangerous. For example, the situation 00100110111111101 is dangerous and 11110111011101 is not. You are given the current situation. Determine whether it is dangerous or not. Input The first input line contains a non-empty string consisting of characters "0" and "1", which represents players. The length of the string does not exceed 100 characters. There's at least one player from each team present on the field. Output Print "YES" if the situation is dangerous. Otherwise, print "NO". Examples Input 001001 Output NO Input 1000000001 Output YES Tags: implementation, strings Correct Solution: ``` pat1 = '0000000' pat2 = '1111111' string = str(input()) if((pat1 in string) or (pat2 in string)): print("YES") else: print("NO") ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. The name of one small but proud corporation consists of n lowercase English letters. The Corporation has decided to try rebranding — an active marketing strategy, that includes a set of measures to change either the brand (both for the company and the goods it produces) or its components: the name, the logo, the slogan. They decided to start with the name. For this purpose the corporation has consecutively hired m designers. Once a company hires the i-th designer, he immediately contributes to the creation of a new corporation name as follows: he takes the newest version of the name and replaces all the letters xi by yi, and all the letters yi by xi. This results in the new version. It is possible that some of these letters do no occur in the string. It may also happen that xi coincides with yi. The version of the name received after the work of the last designer becomes the new name of the corporation. Manager Arkady has recently got a job in this company, but is already soaked in the spirit of teamwork and is very worried about the success of the rebranding. Naturally, he can't wait to find out what is the new name the Corporation will receive. Satisfy Arkady's curiosity and tell him the final version of the name. Input The first line of the input contains two integers n and m (1 ≤ n, m ≤ 200 000) — the length of the initial name and the number of designers hired, respectively. The second line consists of n lowercase English letters and represents the original name of the corporation. Next m lines contain the descriptions of the designers' actions: the i-th of them contains two space-separated lowercase English letters xi and yi. Output Print the new name of the corporation. Examples Input 6 1 police p m Output molice Input 11 6 abacabadaba a b b c a d e g f a b b Output cdcbcdcfcdc Note In the second sample the name of the corporation consecutively changes as follows: <image> <image> <image> <image> <image> <image> Tags: implementation, strings Correct Solution: ``` from sys import * from collections import * def inp(n): if n == 1: return map(int, stdin.readline().split()) elif n == 2: return map(float, stdin.readline().split()) else: return map(str, stdin.readline().split()) def main(): n, m = inp(1) org, mem = deque(input()), defaultdict(int) for i in range(m): u, v = inp(3) flag1, flag2 = 0, 0 for i, j in mem.items(): if not flag1 and j == u: mem[i] = v flag1 = 1 if not flag2 and j == v: mem[i] = u flag2 = 1 if flag1 and flag2: break if not flag1: mem[u] = v if not flag2: mem[v] = u # print(mem) for i in range(n): if mem[org[i]]: org[i]=mem[org[i]] print(''.join(org)) if __name__ == '__main__': main() ```
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Provide tags and a correct Python 3 solution for this coding contest problem. The name of one small but proud corporation consists of n lowercase English letters. The Corporation has decided to try rebranding — an active marketing strategy, that includes a set of measures to change either the brand (both for the company and the goods it produces) or its components: the name, the logo, the slogan. They decided to start with the name. For this purpose the corporation has consecutively hired m designers. Once a company hires the i-th designer, he immediately contributes to the creation of a new corporation name as follows: he takes the newest version of the name and replaces all the letters xi by yi, and all the letters yi by xi. This results in the new version. It is possible that some of these letters do no occur in the string. It may also happen that xi coincides with yi. The version of the name received after the work of the last designer becomes the new name of the corporation. Manager Arkady has recently got a job in this company, but is already soaked in the spirit of teamwork and is very worried about the success of the rebranding. Naturally, he can't wait to find out what is the new name the Corporation will receive. Satisfy Arkady's curiosity and tell him the final version of the name. Input The first line of the input contains two integers n and m (1 ≤ n, m ≤ 200 000) — the length of the initial name and the number of designers hired, respectively. The second line consists of n lowercase English letters and represents the original name of the corporation. Next m lines contain the descriptions of the designers' actions: the i-th of them contains two space-separated lowercase English letters xi and yi. Output Print the new name of the corporation. Examples Input 6 1 police p m Output molice Input 11 6 abacabadaba a b b c a d e g f a b b Output cdcbcdcfcdc Note In the second sample the name of the corporation consecutively changes as follows: <image> <image> <image> <image> <image> <image> Tags: implementation, strings Correct Solution: ``` n, m = [int(i) for i in input().split()] s = input() st = [chr(ord('a')+i) for i in range(26)] for i in range (m) : a, b = input().split() for i in range(26): if st[i] == a: st[i] = b elif st[i] == b: st[i] = a print(''.join([ st[ord(i)-ord('a')] for i in s])) '''RATHER THAN CHANGING LONG STRING WE WILL ONLY CHANG ETHE ALPHABETS AND THEN CHNAGE THE STRING ONLY ONCE ACCORDING TO ALPHABETS ''' ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. The name of one small but proud corporation consists of n lowercase English letters. The Corporation has decided to try rebranding — an active marketing strategy, that includes a set of measures to change either the brand (both for the company and the goods it produces) or its components: the name, the logo, the slogan. They decided to start with the name. For this purpose the corporation has consecutively hired m designers. Once a company hires the i-th designer, he immediately contributes to the creation of a new corporation name as follows: he takes the newest version of the name and replaces all the letters xi by yi, and all the letters yi by xi. This results in the new version. It is possible that some of these letters do no occur in the string. It may also happen that xi coincides with yi. The version of the name received after the work of the last designer becomes the new name of the corporation. Manager Arkady has recently got a job in this company, but is already soaked in the spirit of teamwork and is very worried about the success of the rebranding. Naturally, he can't wait to find out what is the new name the Corporation will receive. Satisfy Arkady's curiosity and tell him the final version of the name. Input The first line of the input contains two integers n and m (1 ≤ n, m ≤ 200 000) — the length of the initial name and the number of designers hired, respectively. The second line consists of n lowercase English letters and represents the original name of the corporation. Next m lines contain the descriptions of the designers' actions: the i-th of them contains two space-separated lowercase English letters xi and yi. Output Print the new name of the corporation. Examples Input 6 1 police p m Output molice Input 11 6 abacabadaba a b b c a d e g f a b b Output cdcbcdcfcdc Note In the second sample the name of the corporation consecutively changes as follows: <image> <image> <image> <image> <image> <image> Tags: implementation, strings Correct Solution: ``` alf = list('abcdefghijklmnopqrstuvwxyz') n, m = map(int, input().split()) s = input() for i in range(m): x, y = input().split() index1 = alf.index(x) index2 = alf.index(y) alf[index1], alf[index2] = alf[index2], alf[index1] for i in s: print(alf[ord(i) - ord('a')], end='') ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. The name of one small but proud corporation consists of n lowercase English letters. The Corporation has decided to try rebranding — an active marketing strategy, that includes a set of measures to change either the brand (both for the company and the goods it produces) or its components: the name, the logo, the slogan. They decided to start with the name. For this purpose the corporation has consecutively hired m designers. Once a company hires the i-th designer, he immediately contributes to the creation of a new corporation name as follows: he takes the newest version of the name and replaces all the letters xi by yi, and all the letters yi by xi. This results in the new version. It is possible that some of these letters do no occur in the string. It may also happen that xi coincides with yi. The version of the name received after the work of the last designer becomes the new name of the corporation. Manager Arkady has recently got a job in this company, but is already soaked in the spirit of teamwork and is very worried about the success of the rebranding. Naturally, he can't wait to find out what is the new name the Corporation will receive. Satisfy Arkady's curiosity and tell him the final version of the name. Input The first line of the input contains two integers n and m (1 ≤ n, m ≤ 200 000) — the length of the initial name and the number of designers hired, respectively. The second line consists of n lowercase English letters and represents the original name of the corporation. Next m lines contain the descriptions of the designers' actions: the i-th of them contains two space-separated lowercase English letters xi and yi. Output Print the new name of the corporation. Examples Input 6 1 police p m Output molice Input 11 6 abacabadaba a b b c a d e g f a b b Output cdcbcdcfcdc Note In the second sample the name of the corporation consecutively changes as follows: <image> <image> <image> <image> <image> <image> Tags: implementation, strings Correct Solution: ``` import string def mp(): return map(int,input().split()) def lt(): return list(map(int,input().split())) def pt(x): print(x) n,m = mp() s = input() s1 = string.ascii_lowercase for i in range(m): L = input().split() a,b = L[0],L[1] s1 = s1.translate(str.maketrans(a+b,b+a)) pt(s.translate(str.maketrans(string.ascii_lowercase,s1))) ```
22,490
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6
Provide tags and a correct Python 3 solution for this coding contest problem. The name of one small but proud corporation consists of n lowercase English letters. The Corporation has decided to try rebranding — an active marketing strategy, that includes a set of measures to change either the brand (both for the company and the goods it produces) or its components: the name, the logo, the slogan. They decided to start with the name. For this purpose the corporation has consecutively hired m designers. Once a company hires the i-th designer, he immediately contributes to the creation of a new corporation name as follows: he takes the newest version of the name and replaces all the letters xi by yi, and all the letters yi by xi. This results in the new version. It is possible that some of these letters do no occur in the string. It may also happen that xi coincides with yi. The version of the name received after the work of the last designer becomes the new name of the corporation. Manager Arkady has recently got a job in this company, but is already soaked in the spirit of teamwork and is very worried about the success of the rebranding. Naturally, he can't wait to find out what is the new name the Corporation will receive. Satisfy Arkady's curiosity and tell him the final version of the name. Input The first line of the input contains two integers n and m (1 ≤ n, m ≤ 200 000) — the length of the initial name and the number of designers hired, respectively. The second line consists of n lowercase English letters and represents the original name of the corporation. Next m lines contain the descriptions of the designers' actions: the i-th of them contains two space-separated lowercase English letters xi and yi. Output Print the new name of the corporation. Examples Input 6 1 police p m Output molice Input 11 6 abacabadaba a b b c a d e g f a b b Output cdcbcdcfcdc Note In the second sample the name of the corporation consecutively changes as follows: <image> <image> <image> <image> <image> <image> Tags: implementation, strings Correct Solution: ``` import sys size,swaps=map(int,sys.stdin.readline().split()) word=sys.stdin.readline() alp='abcdefghijklmnopqrstuvwxyz' alp2='abcdefghijklmnopqrstuvwxyz' for i in range(swaps): a,b=map(str,sys.stdin.readline().split()) alp2=alp2.replace(a,b.upper()) alp2=alp2.replace(b,a) alp2=alp2.lower() for i in range(26): word=word.replace(alp[i],alp2[i].upper()) sys.stdout.write(word.lower().strip('\n')) ```
22,491
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6
Provide tags and a correct Python 3 solution for this coding contest problem. The name of one small but proud corporation consists of n lowercase English letters. The Corporation has decided to try rebranding — an active marketing strategy, that includes a set of measures to change either the brand (both for the company and the goods it produces) or its components: the name, the logo, the slogan. They decided to start with the name. For this purpose the corporation has consecutively hired m designers. Once a company hires the i-th designer, he immediately contributes to the creation of a new corporation name as follows: he takes the newest version of the name and replaces all the letters xi by yi, and all the letters yi by xi. This results in the new version. It is possible that some of these letters do no occur in the string. It may also happen that xi coincides with yi. The version of the name received after the work of the last designer becomes the new name of the corporation. Manager Arkady has recently got a job in this company, but is already soaked in the spirit of teamwork and is very worried about the success of the rebranding. Naturally, he can't wait to find out what is the new name the Corporation will receive. Satisfy Arkady's curiosity and tell him the final version of the name. Input The first line of the input contains two integers n and m (1 ≤ n, m ≤ 200 000) — the length of the initial name and the number of designers hired, respectively. The second line consists of n lowercase English letters and represents the original name of the corporation. Next m lines contain the descriptions of the designers' actions: the i-th of them contains two space-separated lowercase English letters xi and yi. Output Print the new name of the corporation. Examples Input 6 1 police p m Output molice Input 11 6 abacabadaba a b b c a d e g f a b b Output cdcbcdcfcdc Note In the second sample the name of the corporation consecutively changes as follows: <image> <image> <image> <image> <image> <image> Tags: implementation, strings Correct Solution: ``` n,m=map(int,input().split()) x=list(input()) d={} y=list(set(x)) z=list(set(x)) for i in x: d[i]=i for t in range(m): a,b=map(str,input().split()) for i in range(len(y)): if y[i]==a: y[i]=b elif y[i]==b: y[i]=a for i in range(len(y)): d[z[i]]=y[i] # print(d) for i in range(n): x[i]=d[x[i]] print("".join(x)) ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. The name of one small but proud corporation consists of n lowercase English letters. The Corporation has decided to try rebranding — an active marketing strategy, that includes a set of measures to change either the brand (both for the company and the goods it produces) or its components: the name, the logo, the slogan. They decided to start with the name. For this purpose the corporation has consecutively hired m designers. Once a company hires the i-th designer, he immediately contributes to the creation of a new corporation name as follows: he takes the newest version of the name and replaces all the letters xi by yi, and all the letters yi by xi. This results in the new version. It is possible that some of these letters do no occur in the string. It may also happen that xi coincides with yi. The version of the name received after the work of the last designer becomes the new name of the corporation. Manager Arkady has recently got a job in this company, but is already soaked in the spirit of teamwork and is very worried about the success of the rebranding. Naturally, he can't wait to find out what is the new name the Corporation will receive. Satisfy Arkady's curiosity and tell him the final version of the name. Input The first line of the input contains two integers n and m (1 ≤ n, m ≤ 200 000) — the length of the initial name and the number of designers hired, respectively. The second line consists of n lowercase English letters and represents the original name of the corporation. Next m lines contain the descriptions of the designers' actions: the i-th of them contains two space-separated lowercase English letters xi and yi. Output Print the new name of the corporation. Examples Input 6 1 police p m Output molice Input 11 6 abacabadaba a b b c a d e g f a b b Output cdcbcdcfcdc Note In the second sample the name of the corporation consecutively changes as follows: <image> <image> <image> <image> <image> <image> Tags: implementation, strings Correct Solution: ``` import math from decimal import Decimal def na(): n = int(input()) b = [int(x) for x in input().split()] return n,b def nab(): n = int(input()) b = [int(x) for x in input().split()] c = [int(x) for x in input().split()] return n,b,c def dv(): n, m = map(int, input().split()) return n,m def dva(): n, m = map(int, input().split()) a = [int(x) for x in input().split()] b = [int(x) for x in input().split()] return n,m,b def eratosthenes(n): sieve = list(range(n + 1)) for i in sieve: if i > 1: for j in range(i + i, len(sieve), i): sieve[j] = 0 return sorted(set(sieve)) def nm(): n = int(input()) b = [int(x) for x in input().split()] m = int(input()) c = [int(x) for x in input().split()] return n,b,m,c def dvs(): n = int(input()) m = int(input()) return n, m n, m = map(int, input().split()) s = input() d = {} for i in range(97, 123): d[chr(i)] = chr(i) for i in range(m): x, y = input().split() d[x], d[y] = d[y], d[x] new = '' t = {} for i in d: t[d[i]] = i for i in s: new += t[i] print(new) ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. The name of one small but proud corporation consists of n lowercase English letters. The Corporation has decided to try rebranding — an active marketing strategy, that includes a set of measures to change either the brand (both for the company and the goods it produces) or its components: the name, the logo, the slogan. They decided to start with the name. For this purpose the corporation has consecutively hired m designers. Once a company hires the i-th designer, he immediately contributes to the creation of a new corporation name as follows: he takes the newest version of the name and replaces all the letters xi by yi, and all the letters yi by xi. This results in the new version. It is possible that some of these letters do no occur in the string. It may also happen that xi coincides with yi. The version of the name received after the work of the last designer becomes the new name of the corporation. Manager Arkady has recently got a job in this company, but is already soaked in the spirit of teamwork and is very worried about the success of the rebranding. Naturally, he can't wait to find out what is the new name the Corporation will receive. Satisfy Arkady's curiosity and tell him the final version of the name. Input The first line of the input contains two integers n and m (1 ≤ n, m ≤ 200 000) — the length of the initial name and the number of designers hired, respectively. The second line consists of n lowercase English letters and represents the original name of the corporation. Next m lines contain the descriptions of the designers' actions: the i-th of them contains two space-separated lowercase English letters xi and yi. Output Print the new name of the corporation. Examples Input 6 1 police p m Output molice Input 11 6 abacabadaba a b b c a d e g f a b b Output cdcbcdcfcdc Note In the second sample the name of the corporation consecutively changes as follows: <image> <image> <image> <image> <image> <image> Tags: implementation, strings Correct Solution: ``` n,m=map(int,input().split()) st=input() dic={} xr="abcdefghijklmnopqrstuvwxyz" for x in xr: dic[x]=x for x in range(m): g,h=input().split() dic[g],dic[h]=dic[h],dic[g] #print(dic) t={} for k in dic: t[dic[k]]=k #print(t) ls=[ t[x] for x in st] print(''.join(ls)) ```
22,494
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Berland scientists know that the Old Berland language had exactly n words. Those words had lengths of l1, l2, ..., ln letters. Every word consisted of two letters, 0 and 1. Ancient Berland people spoke quickly and didn’t make pauses between the words, but at the same time they could always understand each other perfectly. It was possible because no word was a prefix of another one. The prefix of a string is considered to be one of its substrings that starts from the initial symbol. Help the scientists determine whether all the words of the Old Berland language can be reconstructed and if they can, output the words themselves. Input The first line contains one integer N (1 ≤ N ≤ 1000) — the number of words in Old Berland language. The second line contains N space-separated integers — the lengths of these words. All the lengths are natural numbers not exceeding 1000. Output If there’s no such set of words, in the single line output NO. Otherwise, in the first line output YES, and in the next N lines output the words themselves in the order their lengths were given in the input file. If the answer is not unique, output any. Examples Input 3 1 2 3 Output YES 0 10 110 Input 3 1 1 1 Output NO Tags: data structures, greedy, trees Correct Solution: ``` # https://codeforces.com/contest/37/problem/C import sys sys.setrecursionlimit(100000) class Node: def __init__(self): self.child = dict() self.isEnd = 0 def DFS(stack, level, mark, arr, m, pos): if len(mark) == level: arr.append((pos, mark)) stack.isEnd = 1 return for i in ['0', '1']: if len(arr) != m: return if not stack.child.get(i): stack.child[i] = Node() DFS(stack.child[i], level, mark + i, arr, m, pos) elif not stack.child[i].isEnd: DFS(stack.child[i], level, mark + i, arr, m, pos) def addWord(root, level, arr): temp = root mark = len(arr) pos = level[0] level = level[1] DFS(temp, level, '', arr, mark, pos) if temp.isEnd or mark == len(arr): return False return True n = int(input()) l = list(map(int, input().split())) for i in range(n): l[i] = (i, l[i]) l.sort(key=lambda x: x[1]) root = Node() ans = [] for i in l: if not addWord(root, i, ans): print('NO') exit() ans.sort(key=lambda x: x[0]) print('YES') for i in ans: print(i[1]) ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Berland scientists know that the Old Berland language had exactly n words. Those words had lengths of l1, l2, ..., ln letters. Every word consisted of two letters, 0 and 1. Ancient Berland people spoke quickly and didn’t make pauses between the words, but at the same time they could always understand each other perfectly. It was possible because no word was a prefix of another one. The prefix of a string is considered to be one of its substrings that starts from the initial symbol. Help the scientists determine whether all the words of the Old Berland language can be reconstructed and if they can, output the words themselves. Input The first line contains one integer N (1 ≤ N ≤ 1000) — the number of words in Old Berland language. The second line contains N space-separated integers — the lengths of these words. All the lengths are natural numbers not exceeding 1000. Output If there’s no such set of words, in the single line output NO. Otherwise, in the first line output YES, and in the next N lines output the words themselves in the order their lengths were given in the input file. If the answer is not unique, output any. Examples Input 3 1 2 3 Output YES 0 10 110 Input 3 1 1 1 Output NO Tags: data structures, greedy, trees Correct Solution: ``` class Node(): def __init__(self): self.child = dict() self.count = 0 self.weight = 0 def addWord(root, s): s = "" tmp = root length = 0 flag = False for i in range(s): if len(tmp.child) == 0: tmp.child[0] = Node() tmp = tmp.child[0] elif len(tmp.child) == 1: if tmp.child[0].count > 0: tmp.child[1] = Node() tmp = tmp.child[1] tmp.count+=1 else: tmp = tmp.child[0] elif len(tmp.child) == 2: if tmp.child[0].count > 0 and tmp.child[1].count > 0: return True elif tmp.child[0].count == 0: tmp = tmp.child[0] else: tmp = tmp.child[1] tmp.count+=1 return False for ch in s: length += 1 if ch in tmp.child: tmp = tmp.child[ch] if tmp.count > 0: flag = True if length == len(s): flag = True else: tmp.child[ch] = Node() tmp = tmp.child[ch] tmp.weight+=1 tmp.count += 1 return flag def find(root,s): tmp = root for ch in s: if ch in tmp.child: tmp = tmp.child[ch] else: return 0 return tmp.weight def isWord(node): return node.count != 0 def isEmpty(node): return len(node.child) == 0 def removeWord(root, s, level, size): if root == None: return False if level == size: if root.count > 0: root.count-=1 return True return False ch = s[level] flag = removeWord(root.child[ch],s,level+1,size) if flag == True and isWord(root.child[ch]) == False and isEmpty(root.child[ch]): tmp = root.child[ch] del tmp del root.child[ch] return flag n = int(input()) cur = 0 word = ["" for _ in range(n)] def dfs(string, depth): global cur, n, ar, word if cur >= n: return if ar[cur][0] == depth: word[ar[cur][1]] = string cur += 1 return string += '0' dfs(string, depth + 1) string = string[:-1] + '1' dfs(string, depth + 1) string = string[:-1] length = [int(i) for i in input().split()] ar = [[length[i],i] for i in range(n)] ar.sort() dfs("",0) if cur < n: print("NO") else: print("YES") for i in range(n): print(word[i]) ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Berland scientists know that the Old Berland language had exactly n words. Those words had lengths of l1, l2, ..., ln letters. Every word consisted of two letters, 0 and 1. Ancient Berland people spoke quickly and didn’t make pauses between the words, but at the same time they could always understand each other perfectly. It was possible because no word was a prefix of another one. The prefix of a string is considered to be one of its substrings that starts from the initial symbol. Help the scientists determine whether all the words of the Old Berland language can be reconstructed and if they can, output the words themselves. Input The first line contains one integer N (1 ≤ N ≤ 1000) — the number of words in Old Berland language. The second line contains N space-separated integers — the lengths of these words. All the lengths are natural numbers not exceeding 1000. Output If there’s no such set of words, in the single line output NO. Otherwise, in the first line output YES, and in the next N lines output the words themselves in the order their lengths were given in the input file. If the answer is not unique, output any. Examples Input 3 1 2 3 Output YES 0 10 110 Input 3 1 1 1 Output NO Tags: data structures, greedy, trees Correct Solution: ``` import itertools t = int e = input I = list r = sorted A = enumerate X = bin m = len u = print o = range p = itertools.groupby n = t(e()) L = [t(_)for _ in e().split()] M = I(r(A(L), key=lambda x: x[1])) N = [0 for x in L] l = 0 b = 0 for k, U in p(M, key=lambda x: x[1]): l <<= k-b b = k for g in U: s = X(l)[2:] N[g[0]] = '0'*(k-m(s))+s l += 1 if l >= (1 << k)+1: u("NO") break else: u("YES") for i in o(n): u(N[i]) ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Berland scientists know that the Old Berland language had exactly n words. Those words had lengths of l1, l2, ..., ln letters. Every word consisted of two letters, 0 and 1. Ancient Berland people spoke quickly and didn’t make pauses between the words, but at the same time they could always understand each other perfectly. It was possible because no word was a prefix of another one. The prefix of a string is considered to be one of its substrings that starts from the initial symbol. Help the scientists determine whether all the words of the Old Berland language can be reconstructed and if they can, output the words themselves. Input The first line contains one integer N (1 ≤ N ≤ 1000) — the number of words in Old Berland language. The second line contains N space-separated integers — the lengths of these words. All the lengths are natural numbers not exceeding 1000. Output If there’s no such set of words, in the single line output NO. Otherwise, in the first line output YES, and in the next N lines output the words themselves in the order their lengths were given in the input file. If the answer is not unique, output any. Examples Input 3 1 2 3 Output YES 0 10 110 Input 3 1 1 1 Output NO Tags: data structures, greedy, trees Correct Solution: ``` n = int(input()) l = list(map(int, input().split())) for i in range(n): l[i] = (l[i], i) l.sort(key=lambda x : x[0]) currentWord = "" firstL = l[0][0] for i in range(firstL): currentWord += '0' ans = ['' for _ in range(n)] ans[l[0][1]] = currentWord for i in range(1, n): haveNext = False while True: lastChar = currentWord[-1] currentWord = currentWord[:-1] if lastChar == '0': currentWord += '1' haveNext = True break elif len(currentWord) == 0: break if not haveNext: print("NO") import sys sys.exit() while len(currentWord) < l[i][0]: currentWord += '0' ans[l[i][1]] = currentWord print('YES') for s in ans: print(s) ```
23,201
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Berland scientists know that the Old Berland language had exactly n words. Those words had lengths of l1, l2, ..., ln letters. Every word consisted of two letters, 0 and 1. Ancient Berland people spoke quickly and didn’t make pauses between the words, but at the same time they could always understand each other perfectly. It was possible because no word was a prefix of another one. The prefix of a string is considered to be one of its substrings that starts from the initial symbol. Help the scientists determine whether all the words of the Old Berland language can be reconstructed and if they can, output the words themselves. Input The first line contains one integer N (1 ≤ N ≤ 1000) — the number of words in Old Berland language. The second line contains N space-separated integers — the lengths of these words. All the lengths are natural numbers not exceeding 1000. Output If there’s no such set of words, in the single line output NO. Otherwise, in the first line output YES, and in the next N lines output the words themselves in the order their lengths were given in the input file. If the answer is not unique, output any. Examples Input 3 1 2 3 Output YES 0 10 110 Input 3 1 1 1 Output NO Tags: data structures, greedy, trees Correct Solution: ``` import sys class input_tokenizer: tokens = None def __init__(self): self.tokens = sys.stdin.read().split()[::-1] def has_next(self): return self.tokens != [] and self.tokens != None def next(self): token = self.tokens[-1] self.tokens.pop() return token inp = input_tokenizer() class Node: def __init__(self, index, depth): self.index = index self.depth = depth def __lt__(self, other): return self.depth < other.depth def dfs(s, depth, n, curr, word, arr): stack = [[s, depth]] while True: if len(stack) == 0: break s, depth = stack.pop() if curr >= n: return curr, word if arr[curr].depth == depth: word[arr[curr].index] = s curr += 1 continue next_s = s + '0' stack.append([next_s, depth + 1]) next_s = s + '1' stack.append([next_s, depth + 1]) return curr, word try: n = int(inp.next()) arr = [] for i in range(n): word_len = int(inp.next()) arr.append(Node(i, word_len)) arr.sort() word = ['' for i in range(n)] curr = 0 results = dfs('', 0, n, curr, word, arr) word = results[1] curr = results[0] if curr < n: print('NO') else: print('YES') print(*word, sep='\n') except Exception as ex: print(ex) ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Berland scientists know that the Old Berland language had exactly n words. Those words had lengths of l1, l2, ..., ln letters. Every word consisted of two letters, 0 and 1. Ancient Berland people spoke quickly and didn’t make pauses between the words, but at the same time they could always understand each other perfectly. It was possible because no word was a prefix of another one. The prefix of a string is considered to be one of its substrings that starts from the initial symbol. Help the scientists determine whether all the words of the Old Berland language can be reconstructed and if they can, output the words themselves. Input The first line contains one integer N (1 ≤ N ≤ 1000) — the number of words in Old Berland language. The second line contains N space-separated integers — the lengths of these words. All the lengths are natural numbers not exceeding 1000. Output If there’s no such set of words, in the single line output NO. Otherwise, in the first line output YES, and in the next N lines output the words themselves in the order their lengths were given in the input file. If the answer is not unique, output any. Examples Input 3 1 2 3 Output YES 0 10 110 Input 3 1 1 1 Output NO Tags: data structures, greedy, trees Correct Solution: ``` import sys sys.setrecursionlimit(1000000) class Node(): def __init__(self, val): self.child = dict() self.blocked = False self.val = val class Trie(): def __init__(self): self.root = Node("") def addLength(self, length, id, res): cur = self.root stk = [cur] while length > 0 and len(stk) > 0: length -= 1 if 0 not in cur.child : cur.child[0] = Node("0") if not cur.child[0].blocked: cur = cur.child[0] else: if 1 not in cur.child: cur.child[1] = Node("1") if not cur.child[1].blocked: cur = cur.child[1] else: cur.blocked = True stk.pop() if len(stk) > 0: cur = stk[-1] length += 2 continue stk.append(cur) if len(stk) == 0: return False cur.blocked = True res[id] = ''.join(x.val for x in stk) #print(res[id]) return True n = int(input()) a = list(map(int, input().split())) a = sorted([(a[i], i) for i in range(n)]) trie = Trie() res = [""] * n #print(*a) for length, i in a: if not trie.addLength(length, i, res): print("NO") exit(0) print("YES") print(*res, sep = "\n") ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Berland scientists know that the Old Berland language had exactly n words. Those words had lengths of l1, l2, ..., ln letters. Every word consisted of two letters, 0 and 1. Ancient Berland people spoke quickly and didn’t make pauses between the words, but at the same time they could always understand each other perfectly. It was possible because no word was a prefix of another one. The prefix of a string is considered to be one of its substrings that starts from the initial symbol. Help the scientists determine whether all the words of the Old Berland language can be reconstructed and if they can, output the words themselves. Input The first line contains one integer N (1 ≤ N ≤ 1000) — the number of words in Old Berland language. The second line contains N space-separated integers — the lengths of these words. All the lengths are natural numbers not exceeding 1000. Output If there’s no such set of words, in the single line output NO. Otherwise, in the first line output YES, and in the next N lines output the words themselves in the order their lengths were given in the input file. If the answer is not unique, output any. Examples Input 3 1 2 3 Output YES 0 10 110 Input 3 1 1 1 Output NO Tags: data structures, greedy, trees Correct Solution: ``` n, ls = int(input()), list(map(int, input().split())) l = [(ls[i], i) for i in range(n)] l.sort(key = lambda x: x[0]) c, a = 0, ['0'*l[0][0]] for i in range(1, n): if c == 2**l[i-1][0]-1: break c = (c+1) * 2**(l[i][0] - l[i-1][0]) a.append(format(c, "0" + str(l[i][0]) + "b")) if len(a) == n: print("YES") ans = [0] * n for i in range(n): ans[l[i][1]] = a[i] for i in range(n): print(ans[i]) else: print("NO") # Made By Mostafa_Khaled ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Berland scientists know that the Old Berland language had exactly n words. Those words had lengths of l1, l2, ..., ln letters. Every word consisted of two letters, 0 and 1. Ancient Berland people spoke quickly and didn’t make pauses between the words, but at the same time they could always understand each other perfectly. It was possible because no word was a prefix of another one. The prefix of a string is considered to be one of its substrings that starts from the initial symbol. Help the scientists determine whether all the words of the Old Berland language can be reconstructed and if they can, output the words themselves. Input The first line contains one integer N (1 ≤ N ≤ 1000) — the number of words in Old Berland language. The second line contains N space-separated integers — the lengths of these words. All the lengths are natural numbers not exceeding 1000. Output If there’s no such set of words, in the single line output NO. Otherwise, in the first line output YES, and in the next N lines output the words themselves in the order their lengths were given in the input file. If the answer is not unique, output any. Examples Input 3 1 2 3 Output YES 0 10 110 Input 3 1 1 1 Output NO Tags: data structures, greedy, trees Correct Solution: ``` """ https://codeforces.com/contest/37/problem/C """ curr, n = 0, 0 a = [] word = [] def dfs(string, depth): global curr, n, a, word if curr >= n: return if a[curr][0] == depth: word[a[curr][1]] = string curr += 1 return string += '0' dfs(string, depth + 1) string = string[:-1] + '1' dfs(string, depth + 1) string = string[:-1] def main(): global curr, n, a, word n = int(input()) length = list(map(int, input().split())) a = [[length[i], i] for i in range(n)] word = ["" for _ in range(n)] a.sort() curr = 0 dfs("", 0) if curr < n: print("NO") else: print("YES") for i in range(n): print(word[i]) return 0 if __name__ == "__main__": main() ```
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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. Berland scientists know that the Old Berland language had exactly n words. Those words had lengths of l1, l2, ..., ln letters. Every word consisted of two letters, 0 and 1. Ancient Berland people spoke quickly and didn’t make pauses between the words, but at the same time they could always understand each other perfectly. It was possible because no word was a prefix of another one. The prefix of a string is considered to be one of its substrings that starts from the initial symbol. Help the scientists determine whether all the words of the Old Berland language can be reconstructed and if they can, output the words themselves. Input The first line contains one integer N (1 ≤ N ≤ 1000) — the number of words in Old Berland language. The second line contains N space-separated integers — the lengths of these words. All the lengths are natural numbers not exceeding 1000. Output If there’s no such set of words, in the single line output NO. Otherwise, in the first line output YES, and in the next N lines output the words themselves in the order their lengths were given in the input file. If the answer is not unique, output any. Examples Input 3 1 2 3 Output YES 0 10 110 Input 3 1 1 1 Output NO Submitted Solution: ``` import sys import operator import queue sys.setrecursionlimit(100000) # global constant INF = int(1e7+1) MAX = 2 # For testing #sys.stdin = open("INP.txt", 'r') #sys.stdout = open("OUT.txt", 'w') # global variables ans = 1000*[None] # classes class Pair: def __init__(self, first, second): self.first = first self.second = second class node: def __init__(self): self.countLeaf = 0 self.child = MAX*[None] self.isValid = True # functions def addWord(root, length, string): if length == 0: return True, string if not root.child[0] or root.child[0].isValid: string+='0' if not root.child[0]: root.child[0] = node() if length==1: root.child[0].isValid = False ret, string = addWord(root.child[0], length-1, string) if root.child[0] and root.child[1] and not root.child[0].isValid and not root.child[1].isValid: root.isValid = False return ret, string elif not root.child[1] or root.child[1].isValid: string+='1' if not root.child[1]: root.child[1] = node() if length==1: root.child[1].isValid = False ret, string = addWord(root.child[1], length-1, string) if root.child[0] and root.child[1] and not root.child[0].isValid and not root.child[1].isValid: root.isValid = False return ret, string return False, string # main function def main(): n = int(input()) a = list(map(int, input().split())) for i in range(n): a[i] = Pair(a[i], i) a.sort(key = lambda x: x.first) root = node() for word in a: flag, string = addWord(root, word.first, '') if not flag: print("NO") raise SystemExit ans[word.second] = string print("YES") for i in range(n): print(ans[i]) main() ``` Yes
23,206
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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. Berland scientists know that the Old Berland language had exactly n words. Those words had lengths of l1, l2, ..., ln letters. Every word consisted of two letters, 0 and 1. Ancient Berland people spoke quickly and didn’t make pauses between the words, but at the same time they could always understand each other perfectly. It was possible because no word was a prefix of another one. The prefix of a string is considered to be one of its substrings that starts from the initial symbol. Help the scientists determine whether all the words of the Old Berland language can be reconstructed and if they can, output the words themselves. Input The first line contains one integer N (1 ≤ N ≤ 1000) — the number of words in Old Berland language. The second line contains N space-separated integers — the lengths of these words. All the lengths are natural numbers not exceeding 1000. Output If there’s no such set of words, in the single line output NO. Otherwise, in the first line output YES, and in the next N lines output the words themselves in the order their lengths were given in the input file. If the answer is not unique, output any. Examples Input 3 1 2 3 Output YES 0 10 110 Input 3 1 1 1 Output NO Submitted Solution: ``` from sys import setrecursionlimit setrecursionlimit(1000000) bit = ['0', '1'] class Node: def __init__(self): self.endWord = False self.child = {} def addWord(root, lengthLeft): if root.endWord: return False if lengthLeft == 0: root.endWord = True return True for char in bit: if char not in root.child: root.child[char] = Node() if addWord(root.child[char], lengthLeft - 1): return True return False def saveWord(root, st): if root.endWord: global words words.append(st) for char in root.child: saveWord(root.child[char], st + char) N = int(input()) root = Node() lengths = list(map(int, input().split())) sortedLens = [] for i in range(1, N + 1): sortedLens.append((lengths[i - 1], i)) sortedLens.sort() for length, ID in sortedLens: if not addWord(root, length): print("NO") exit() words = [] saveWord(root, "") ans = [] for i in range(N): length, ID = sortedLens[i] word = words[i] ans.append((ID, word)) ans.sort() print("YES") for ID, word in ans: print(word) ``` Yes
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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. Berland scientists know that the Old Berland language had exactly n words. Those words had lengths of l1, l2, ..., ln letters. Every word consisted of two letters, 0 and 1. Ancient Berland people spoke quickly and didn’t make pauses between the words, but at the same time they could always understand each other perfectly. It was possible because no word was a prefix of another one. The prefix of a string is considered to be one of its substrings that starts from the initial symbol. Help the scientists determine whether all the words of the Old Berland language can be reconstructed and if they can, output the words themselves. Input The first line contains one integer N (1 ≤ N ≤ 1000) — the number of words in Old Berland language. The second line contains N space-separated integers — the lengths of these words. All the lengths are natural numbers not exceeding 1000. Output If there’s no such set of words, in the single line output NO. Otherwise, in the first line output YES, and in the next N lines output the words themselves in the order their lengths were given in the input file. If the answer is not unique, output any. Examples Input 3 1 2 3 Output YES 0 10 110 Input 3 1 1 1 Output NO Submitted Solution: ``` def get_next(b): if not b: b.append(0) return add = 1 remember = 0 for i in range(len(b) - 1 , -1 , -1): temp = b[i] + add + remember if temp > 1: temp = 0 remember = 1 else: remember = 0 add = 0 b[i] = temp def is_largest(b): if not b: return False for i in range(len(b)): if b[i] == 0: return False return True def solve(): N = int(input()) items =[] index = 0 for length in map(int,input().split()): items.append((index,length)) index += 1 items = sorted(items,key=lambda item: item[1]) result = [] results = [0 for _ in range(N)] for item in items: index,length = item if is_largest(result): print('NO') break if result: get_next(result) else: result = [0 for _ in range(length)] while len(result) < length: result.append(0) results[index] = ''.join(str(num) for num in result) else: print('YES') for result in results: print(result) solve() ``` Yes
23,208
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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. Berland scientists know that the Old Berland language had exactly n words. Those words had lengths of l1, l2, ..., ln letters. Every word consisted of two letters, 0 and 1. Ancient Berland people spoke quickly and didn’t make pauses between the words, but at the same time they could always understand each other perfectly. It was possible because no word was a prefix of another one. The prefix of a string is considered to be one of its substrings that starts from the initial symbol. Help the scientists determine whether all the words of the Old Berland language can be reconstructed and if they can, output the words themselves. Input The first line contains one integer N (1 ≤ N ≤ 1000) — the number of words in Old Berland language. The second line contains N space-separated integers — the lengths of these words. All the lengths are natural numbers not exceeding 1000. Output If there’s no such set of words, in the single line output NO. Otherwise, in the first line output YES, and in the next N lines output the words themselves in the order their lengths were given in the input file. If the answer is not unique, output any. Examples Input 3 1 2 3 Output YES 0 10 110 Input 3 1 1 1 Output NO Submitted Solution: ``` import sys sys.setrecursionlimit(1050) class Node: def __init__(self, depth, parent): self.depth = depth self.parent = parent self.left = None self.right = None self.leaf = False def __str__(self): return 'depth = %d, left? %s, right? %s' % (self.depth, self.left != None, self.right != None) stacks = {} def traverse(node, symbols): if node.leaf: s = ''.join(symbols) stacks.setdefault(len(s), []).append(s) return if node.left != None: symbols.append('0') traverse(node.left, symbols) symbols.pop() if node.right != None: symbols.append('1') traverse(node.right, symbols) symbols.pop() n = int(input()) original_lengths = list(map(int, input().split())) lengths = sorted(original_lengths[:]) root = Node(0, None) curr = root for i in range(lengths[0]): curr.left = Node(curr.depth+1, curr) curr = curr.left curr.leaf = True for length in lengths[1:]: curr = curr.parent while curr.right != None: if curr == root: print('NO') sys.exit() curr = curr.parent curr.right = Node(curr.depth+1, curr) curr = curr.right while curr.depth != length: curr.left = Node(curr.depth+1, curr) curr = curr.left curr.leaf = True print('YES') traverse(root, []) for length in original_lengths: print(stacks[length].pop()) ``` Yes
23,209
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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. Berland scientists know that the Old Berland language had exactly n words. Those words had lengths of l1, l2, ..., ln letters. Every word consisted of two letters, 0 and 1. Ancient Berland people spoke quickly and didn’t make pauses between the words, but at the same time they could always understand each other perfectly. It was possible because no word was a prefix of another one. The prefix of a string is considered to be one of its substrings that starts from the initial symbol. Help the scientists determine whether all the words of the Old Berland language can be reconstructed and if they can, output the words themselves. Input The first line contains one integer N (1 ≤ N ≤ 1000) — the number of words in Old Berland language. The second line contains N space-separated integers — the lengths of these words. All the lengths are natural numbers not exceeding 1000. Output If there’s no such set of words, in the single line output NO. Otherwise, in the first line output YES, and in the next N lines output the words themselves in the order their lengths were given in the input file. If the answer is not unique, output any. Examples Input 3 1 2 3 Output YES 0 10 110 Input 3 1 1 1 Output NO Submitted Solution: ``` from sys import stdin n = int(stdin.readline()) a = [int(x) for x in stdin.readline().split()] a.sort() high = a[-1] total = 1<<high a = [high-x for x in a] current = 0 words = [] for x in a: words.append(current>>x) current += 1<<x if current > total: print('NO') else: print('YES') print('\n'.join(["{0:b}".format(x) for x in words])) ``` No
23,210
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Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. Berland scientists know that the Old Berland language had exactly n words. Those words had lengths of l1, l2, ..., ln letters. Every word consisted of two letters, 0 and 1. Ancient Berland people spoke quickly and didn’t make pauses between the words, but at the same time they could always understand each other perfectly. It was possible because no word was a prefix of another one. The prefix of a string is considered to be one of its substrings that starts from the initial symbol. Help the scientists determine whether all the words of the Old Berland language can be reconstructed and if they can, output the words themselves. Input The first line contains one integer N (1 ≤ N ≤ 1000) — the number of words in Old Berland language. The second line contains N space-separated integers — the lengths of these words. All the lengths are natural numbers not exceeding 1000. Output If there’s no such set of words, in the single line output NO. Otherwise, in the first line output YES, and in the next N lines output the words themselves in the order their lengths were given in the input file. If the answer is not unique, output any. Examples Input 3 1 2 3 Output YES 0 10 110 Input 3 1 1 1 Output NO Submitted Solution: ``` # l1, l2, ln # 1 2 3 # 0 10 110 # 1 01 001 # 0 1 ? # N # 1 2 3 # root # 0 1 # 0 in children and this node is end of word => 1 ? , 1 is also end of word: yes: return NO # else: add children in # 1: add 0 # prefix is when end of word # 0 1 1 0 # 0 1 1 1 class Node: def __init__(self): self.endWord = False self.children = {} # add(1) # 0 # add(2) # 10 # add(3) # 110 # add(2) # 00 # add(2) # 01 # add(2) # 0 def addNode(root, num): # num = 1, 2 ,3 s = '' cur = root for i in range(num): c = '0' if c not in cur.children: cur.children[c] = Node() elif cur.children[c].endWord == True: c = '1' if c not in cur.children: cur.children[c] = Node() elif cur.children[c].endWord == True: return '' cur = cur.children[c] # print(cur) s += c # print(s) cur.endWord = True return s def main(): n = int(input()) nums = map(int, input().split()) res = [] root = Node() # print(res) for num in nums: s = addNode(root, num) # print(s) if s == '': return [] res.append(s) return res ans = main() if len(ans) == 0: print('NO') else: print('YES') print('\n'.join(ans)) ``` No
23,211
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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. Berland scientists know that the Old Berland language had exactly n words. Those words had lengths of l1, l2, ..., ln letters. Every word consisted of two letters, 0 and 1. Ancient Berland people spoke quickly and didn’t make pauses between the words, but at the same time they could always understand each other perfectly. It was possible because no word was a prefix of another one. The prefix of a string is considered to be one of its substrings that starts from the initial symbol. Help the scientists determine whether all the words of the Old Berland language can be reconstructed and if they can, output the words themselves. Input The first line contains one integer N (1 ≤ N ≤ 1000) — the number of words in Old Berland language. The second line contains N space-separated integers — the lengths of these words. All the lengths are natural numbers not exceeding 1000. Output If there’s no such set of words, in the single line output NO. Otherwise, in the first line output YES, and in the next N lines output the words themselves in the order their lengths were given in the input file. If the answer is not unique, output any. Examples Input 3 1 2 3 Output YES 0 10 110 Input 3 1 1 1 Output NO Submitted Solution: ``` # Problem from Codeforces # http://codeforces.com/contest/37/problem/C import sys class input_tokenizer: __tokens = None def has_next(self): return self.__tokens != [] and self.__tokens != None def next(self): token = self.__tokens[-1] self.__tokens.pop() return token def __init__(self): self.__tokens = sys.stdin.read().split()[::-1] inp = input_tokenizer() class Node: def __init__(self, index, depth): self.index = index self.depth = depth def __lt__(self, other): return self.depth < other.depth def dfs(s, depth, n, curr, word, arr): if curr >= n: return curr, word if arr[curr].depth == depth: word[arr[curr].index] = s curr += 1 return curr, word s += '0' curr, word = dfs(s, depth + 1, n, curr, word, arr) s = s[:len(s) - 1] + '1' curr, word = dfs(s, depth + 1, n, curr, word, arr) return curr, word def solution(): try: n = int(inp.next()) arr = [] for i in range(n): word_len = int(inp.next()) arr.append(Node(i, word_len)) arr.sort() word = ['' for i in range(n)] curr = 0 results = dfs('', 0, n, curr, word, arr) word = results[1] curr = results[0] if curr < n: print('NO') else: print('YES') print(*word, sep='\n') except Exception: import traceback print(traceback.format_exc()) solution() ``` No
23,212
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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. Berland scientists know that the Old Berland language had exactly n words. Those words had lengths of l1, l2, ..., ln letters. Every word consisted of two letters, 0 and 1. Ancient Berland people spoke quickly and didn’t make pauses between the words, but at the same time they could always understand each other perfectly. It was possible because no word was a prefix of another one. The prefix of a string is considered to be one of its substrings that starts from the initial symbol. Help the scientists determine whether all the words of the Old Berland language can be reconstructed and if they can, output the words themselves. Input The first line contains one integer N (1 ≤ N ≤ 1000) — the number of words in Old Berland language. The second line contains N space-separated integers — the lengths of these words. All the lengths are natural numbers not exceeding 1000. Output If there’s no such set of words, in the single line output NO. Otherwise, in the first line output YES, and in the next N lines output the words themselves in the order their lengths were given in the input file. If the answer is not unique, output any. Examples Input 3 1 2 3 Output YES 0 10 110 Input 3 1 1 1 Output NO Submitted Solution: ``` import sys class Node: def __init__(self, depth, parent): self.depth = depth self.parent = parent self.left = None self.right = None self.leaf = False def __str__(self): return 'depth = %d, left? %s, right? %s' % (self.depth, self.left != None, self.right != None) def traverse(node, symbols): if node.leaf: print(''.join(symbols)) return if node.left != None: symbols.append('0') traverse(node.left, symbols) symbols.pop() if node.right != None: symbols.append('1') traverse(node.right, symbols) symbols.pop() n = int(input()) lengths = sorted(list(map(int, input().split()))) root = Node(0, None) curr = root for i in range(lengths[0]): curr.left = Node(curr.depth+1, curr) curr = curr.left curr.leaf = True for length in lengths[1:]: curr = curr.parent while curr.right != None: if curr == root: print('NO') sys.exit() curr = curr.parent curr.right = Node(curr.depth+1, curr) curr = curr.right while curr.depth != length: curr.left = Node(curr.depth+1, curr) curr = curr.left curr.leaf = True print('YES') traverse(root, []) ``` No
23,213
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6
Provide tags and a correct Python 3 solution for this coding contest problem. You are given an n × m rectangular table consisting of lower case English letters. In one operation you can completely remove one column from the table. The remaining parts are combined forming a new table. For example, after removing the second column from the table abcd edfg hijk we obtain the table: acd efg hjk A table is called good if its rows are ordered from top to bottom lexicographically, i.e. each row is lexicographically no larger than the following one. Determine the minimum number of operations of removing a column needed to make a given table good. Input The first line contains two integers — n and m (1 ≤ n, m ≤ 100). Next n lines contain m small English letters each — the characters of the table. Output Print a single number — the minimum number of columns that you need to remove in order to make the table good. Examples Input 1 10 codeforces Output 0 Input 4 4 case care test code Output 2 Input 5 4 code forc esco defo rces Output 4 Note In the first sample the table is already good. In the second sample you may remove the first and third column. In the third sample you have to remove all the columns (note that the table where all rows are empty is considered good by definition). Let strings s and t have equal length. Then, s is lexicographically larger than t if they are not equal and the character following the largest common prefix of s and t (the prefix may be empty) in s is alphabetically larger than the corresponding character of t. Tags: brute force, constructive algorithms, implementation Correct Solution: ``` # cook your dish here import sys from functools import lru_cache, cmp_to_key from heapq import merge, heapify, heappop, heappush from math import * from collections import defaultdict as dd, deque, Counter as C from itertools import combinations as comb, permutations as perm from bisect import bisect_left as bl, bisect_right as br, bisect from time import perf_counter from fractions import Fraction import copy import time starttime = time.time() mod = int(pow(10, 9) + 7) mod2 = 998244353 def data(): return sys.stdin.readline().strip() def out(*var, end="\n"): sys.stdout.write(' '.join(map(str, var))+end) def L(): return list(sp()) def sl(): return list(ssp()) def sp(): return map(int, data().split()) def ssp(): return map(str, data().split()) def l1d(n, val=0): return [val for i in range(n)] def l2d(n, m, val=0): return [l1d(n, val) for j in range(m)] try: # sys.setrecursionlimit(int(pow(10,7))) sys.stdin = open("input.txt", "r") # sys.stdout = open("../output.txt", "w") except: pass def pmat(A): for ele in A: print(*ele,end="\n") def seive(): prime=[1 for i in range(10**6+1)] prime[0]=0 prime[1]=0 for i in range(10**6+1): if(prime[i]): for j in range(2*i,10**6+1,i): prime[j]=0 return prime # exit() # from sys import stdin # input = stdin.readline n,m=L() A=[input() for i in range(n)] t=["" for i in range(n)] ans=0 for i in range(m): f=[t[j]+A[j][i] for j in range(n)] if f==sorted(f): t=f else: ans+=1 print(ans) endtime = time.time() # print(f"Runtime of the program is {endtime - starttime}") ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. You are given an n × m rectangular table consisting of lower case English letters. In one operation you can completely remove one column from the table. The remaining parts are combined forming a new table. For example, after removing the second column from the table abcd edfg hijk we obtain the table: acd efg hjk A table is called good if its rows are ordered from top to bottom lexicographically, i.e. each row is lexicographically no larger than the following one. Determine the minimum number of operations of removing a column needed to make a given table good. Input The first line contains two integers — n and m (1 ≤ n, m ≤ 100). Next n lines contain m small English letters each — the characters of the table. Output Print a single number — the minimum number of columns that you need to remove in order to make the table good. Examples Input 1 10 codeforces Output 0 Input 4 4 case care test code Output 2 Input 5 4 code forc esco defo rces Output 4 Note In the first sample the table is already good. In the second sample you may remove the first and third column. In the third sample you have to remove all the columns (note that the table where all rows are empty is considered good by definition). Let strings s and t have equal length. Then, s is lexicographically larger than t if they are not equal and the character following the largest common prefix of s and t (the prefix may be empty) in s is alphabetically larger than the corresponding character of t. Tags: brute force, constructive algorithms, implementation Correct Solution: ``` # cook your dish here from sys import stdin,stdout from collections import Counter from itertools import permutations import bisect import math I=lambda: map(int,stdin.readline().split()) I1=lambda: stdin.readline() n,m=I() if n==1: print(0) exit() s=[I1() for i in range(n)] if m==1: if s==sorted(s): print(0) else: print(1) exit() c,i=0,1 while True: if i>len(s[0]): break for j in range(n-1): if s[j][:i]>s[j+1][:i]: c+=1 s=[x[:(i-1)]+x[i:] for x in s] i-=1 break i+=1 print(c) ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. You are given an n × m rectangular table consisting of lower case English letters. In one operation you can completely remove one column from the table. The remaining parts are combined forming a new table. For example, after removing the second column from the table abcd edfg hijk we obtain the table: acd efg hjk A table is called good if its rows are ordered from top to bottom lexicographically, i.e. each row is lexicographically no larger than the following one. Determine the minimum number of operations of removing a column needed to make a given table good. Input The first line contains two integers — n and m (1 ≤ n, m ≤ 100). Next n lines contain m small English letters each — the characters of the table. Output Print a single number — the minimum number of columns that you need to remove in order to make the table good. Examples Input 1 10 codeforces Output 0 Input 4 4 case care test code Output 2 Input 5 4 code forc esco defo rces Output 4 Note In the first sample the table is already good. In the second sample you may remove the first and third column. In the third sample you have to remove all the columns (note that the table where all rows are empty is considered good by definition). Let strings s and t have equal length. Then, s is lexicographically larger than t if they are not equal and the character following the largest common prefix of s and t (the prefix may be empty) in s is alphabetically larger than the corresponding character of t. Tags: brute force, constructive algorithms, implementation Correct Solution: ``` n, m = list(map(int, input().rstrip().split())) words = [] op = 0 for i in range(n): words += [input()] final = [""]*n for j in range(m): flag = 1 for i in range(n - 1): x = final[i] + words[i][j] y = final[i + 1] + words[i + 1][j] if x > y: op += 1 flag = 0 break if flag == 1: for i in range(n): final[i] += words[i][j] print(op) ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. You are given an n × m rectangular table consisting of lower case English letters. In one operation you can completely remove one column from the table. The remaining parts are combined forming a new table. For example, after removing the second column from the table abcd edfg hijk we obtain the table: acd efg hjk A table is called good if its rows are ordered from top to bottom lexicographically, i.e. each row is lexicographically no larger than the following one. Determine the minimum number of operations of removing a column needed to make a given table good. Input The first line contains two integers — n and m (1 ≤ n, m ≤ 100). Next n lines contain m small English letters each — the characters of the table. Output Print a single number — the minimum number of columns that you need to remove in order to make the table good. Examples Input 1 10 codeforces Output 0 Input 4 4 case care test code Output 2 Input 5 4 code forc esco defo rces Output 4 Note In the first sample the table is already good. In the second sample you may remove the first and third column. In the third sample you have to remove all the columns (note that the table where all rows are empty is considered good by definition). Let strings s and t have equal length. Then, s is lexicographically larger than t if they are not equal and the character following the largest common prefix of s and t (the prefix may be empty) in s is alphabetically larger than the corresponding character of t. Tags: brute force, constructive algorithms, implementation Correct Solution: ``` from sys import maxsize, stdout, stdin,stderr mod = int(1e9+7) import sys def I(): return int(stdin.readline()) def lint(): return [int(x) for x in stdin.readline().split()] def S(): return list(map(str,input().strip())) def grid(r, c): return [lint() for i in range(r)] from collections import defaultdict, Counter, deque import math import heapq from heapq import heappop , heappush import bisect from itertools import groupby from itertools import permutations as comb 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 nCr(n, r): return (fact(n) // (fact(r) * fact(n - r))) # Returns factorial of n def fact(n): res = 1 for i in range(2, n+1): res = res * i return res def primefactors(n): num=0 while n % 2 == 0: num+=1 n = n / 2 for i in range(3,int(math.sqrt(n))+1,2): while n % i== 0: num+=1 n = n // i if n > 2: num+=1 return num ''' def iter_ds(src): store=[src] while len(store): tmp=store.pop() if not vis[tmp]: vis[tmp]=True for j in ar[tmp]: store.append(j) ''' def ask(a): print('? {}'.format(a),flush=True) n=I() return n def dfs(i,p): a,tmp=0,0 for j in d[i]: if j!=p: a+=1 tmp+=dfs(j,i) if a==0: return 0 return tmp/a + 1 def primeFactors(n): l=[] while n % 2 == 0: l.append(2) n = n // 2 if n > 2: l.append(n) return l r,c=lint() s=[] s.append(['a']*(c+1)) for _ in range(r): s.append(['a']+S()) cnt=0 k=0 t=[0]*(r+1) for i in range(1,c+1): flag=0 for j in range(1,r): if not t[j]: if ord(s[j+1][i])<ord(s[j][i]): cnt+=1 flag=1 break if not flag: for j in range(1,r): if s[j][i]<s[j+1][i]: t[j]=1 print(cnt) ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. You are given an n × m rectangular table consisting of lower case English letters. In one operation you can completely remove one column from the table. The remaining parts are combined forming a new table. For example, after removing the second column from the table abcd edfg hijk we obtain the table: acd efg hjk A table is called good if its rows are ordered from top to bottom lexicographically, i.e. each row is lexicographically no larger than the following one. Determine the minimum number of operations of removing a column needed to make a given table good. Input The first line contains two integers — n and m (1 ≤ n, m ≤ 100). Next n lines contain m small English letters each — the characters of the table. Output Print a single number — the minimum number of columns that you need to remove in order to make the table good. Examples Input 1 10 codeforces Output 0 Input 4 4 case care test code Output 2 Input 5 4 code forc esco defo rces Output 4 Note In the first sample the table is already good. In the second sample you may remove the first and third column. In the third sample you have to remove all the columns (note that the table where all rows are empty is considered good by definition). Let strings s and t have equal length. Then, s is lexicographically larger than t if they are not equal and the character following the largest common prefix of s and t (the prefix may be empty) in s is alphabetically larger than the corresponding character of t. Tags: brute force, constructive algorithms, implementation Correct Solution: ``` from operator import itemgetter n, m = map(int, input().strip().split()) table = [] bad_cols = [False] * m for _ in range(n): table.append(input().strip()) for j in range(m): indices = [idx for idx in range(j + 1) if not bad_cols[idx]] for i in range(1, n): if itemgetter(*indices)(table[i]) < itemgetter(*indices)(table[i - 1]): bad_cols[j] = True break print(sum(bad_cols)) ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. You are given an n × m rectangular table consisting of lower case English letters. In one operation you can completely remove one column from the table. The remaining parts are combined forming a new table. For example, after removing the second column from the table abcd edfg hijk we obtain the table: acd efg hjk A table is called good if its rows are ordered from top to bottom lexicographically, i.e. each row is lexicographically no larger than the following one. Determine the minimum number of operations of removing a column needed to make a given table good. Input The first line contains two integers — n and m (1 ≤ n, m ≤ 100). Next n lines contain m small English letters each — the characters of the table. Output Print a single number — the minimum number of columns that you need to remove in order to make the table good. Examples Input 1 10 codeforces Output 0 Input 4 4 case care test code Output 2 Input 5 4 code forc esco defo rces Output 4 Note In the first sample the table is already good. In the second sample you may remove the first and third column. In the third sample you have to remove all the columns (note that the table where all rows are empty is considered good by definition). Let strings s and t have equal length. Then, s is lexicographically larger than t if they are not equal and the character following the largest common prefix of s and t (the prefix may be empty) in s is alphabetically larger than the corresponding character of t. Tags: brute force, constructive algorithms, implementation Correct Solution: ``` n, m = list(map(int, input().split())) ls = [input() for _ in range(n)] sorted_inds = [0] * n ans = 0 for i in range(m): new_sorted_inds = set() for j in range(1, n): if sorted_inds[j] == 0: if ls[j][i] < ls[j - 1][i]: ans += 1 break else: for j in range(1, n): if ls[j][i] > ls[j - 1][i]: sorted_inds[j] = 1 print(ans) ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. You are given an n × m rectangular table consisting of lower case English letters. In one operation you can completely remove one column from the table. The remaining parts are combined forming a new table. For example, after removing the second column from the table abcd edfg hijk we obtain the table: acd efg hjk A table is called good if its rows are ordered from top to bottom lexicographically, i.e. each row is lexicographically no larger than the following one. Determine the minimum number of operations of removing a column needed to make a given table good. Input The first line contains two integers — n and m (1 ≤ n, m ≤ 100). Next n lines contain m small English letters each — the characters of the table. Output Print a single number — the minimum number of columns that you need to remove in order to make the table good. Examples Input 1 10 codeforces Output 0 Input 4 4 case care test code Output 2 Input 5 4 code forc esco defo rces Output 4 Note In the first sample the table is already good. In the second sample you may remove the first and third column. In the third sample you have to remove all the columns (note that the table where all rows are empty is considered good by definition). Let strings s and t have equal length. Then, s is lexicographically larger than t if they are not equal and the character following the largest common prefix of s and t (the prefix may be empty) in s is alphabetically larger than the corresponding character of t. Tags: brute force, constructive algorithms, implementation Correct Solution: ``` import sys import math MAXNUM = math.inf MINNUM = -1 * math.inf ASCIILOWER = 97 ASCIIUPPER = 65 def getInt(): return int(sys.stdin.readline().rstrip()) def getInts(): return map(int, sys.stdin.readline().rstrip().split(" ")) def getString(): return sys.stdin.readline().rstrip() def printOutput(ans): sys.stdout.write() pass def orderedVal(grid, curValues, column): if column == 0: return 0 for i in range(len(grid)): if grid[i][curValues] > grid[i][column]: return math.inf return 0 def isLex(grid, column): for i in range(1, len(grid)): if grid[i][column] < grid[i - 1][column]: return False return True def getLexPairs(grid, column): lPairs = set() for i in range(1, len(grid)): if grid[i][column] == grid[i - 1][column]: lPairs.add((i - 1, i)) return lPairs def compare(grid, column, lPairs): nextlPairs = set() """either returns remaining lPairs, True, or False""" for a, b in lPairs: # print("hi", a, b) # print(grid[a][column], grid[b][column]) if grid[a][column] > grid[b][column]: return False elif grid[a][column] == grid[b][column]: nextlPairs.add((a, b)) return nextlPairs def solve(grid): ans = len(grid[0]) for column in range(len(grid[0])): if ans <= column: break if isLex(grid, column): removeCol = 0 lPairs = getLexPairs(grid, column) # print(column, lPairs) for nextColumn in range(column + 1, len(grid[0])): k = compare(grid, nextColumn, lPairs) # print('comp',k) if k == False: removeCol += 1 elif len(k) == 0: break else: lPairs = k ans = min(ans, column + removeCol) return ans def readinput(): n, m = getInts() grid = [] for _ in range(n): grid.append(getString()) print(solve(grid)) readinput() ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. You are given an n × m rectangular table consisting of lower case English letters. In one operation you can completely remove one column from the table. The remaining parts are combined forming a new table. For example, after removing the second column from the table abcd edfg hijk we obtain the table: acd efg hjk A table is called good if its rows are ordered from top to bottom lexicographically, i.e. each row is lexicographically no larger than the following one. Determine the minimum number of operations of removing a column needed to make a given table good. Input The first line contains two integers — n and m (1 ≤ n, m ≤ 100). Next n lines contain m small English letters each — the characters of the table. Output Print a single number — the minimum number of columns that you need to remove in order to make the table good. Examples Input 1 10 codeforces Output 0 Input 4 4 case care test code Output 2 Input 5 4 code forc esco defo rces Output 4 Note In the first sample the table is already good. In the second sample you may remove the first and third column. In the third sample you have to remove all the columns (note that the table where all rows are empty is considered good by definition). Let strings s and t have equal length. Then, s is lexicographically larger than t if they are not equal and the character following the largest common prefix of s and t (the prefix may be empty) in s is alphabetically larger than the corresponding character of t. Tags: brute force, constructive algorithms, implementation Correct Solution: ``` line = input().split() n = int(line[0]) m = int(line[1]) data = [] for i in range(n): data.append(input()) x = [1 for i in range(n)] delete = 0 for i in range(m): dum = [1 for j in range(n)] status = 1 for j in range(1,n): if data[j][i] > data[j-1][i]: dum[j] = 0 elif data[j][i] == data[j-1][i]: dum[j] = 1 else: if x[j] == 1: delete += 1 status = 0 break if status == 1: for j in range(len(dum)): if dum[j] == 0: x[j] = 0 print(delete) ```
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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. You are given an n × m rectangular table consisting of lower case English letters. In one operation you can completely remove one column from the table. The remaining parts are combined forming a new table. For example, after removing the second column from the table abcd edfg hijk we obtain the table: acd efg hjk A table is called good if its rows are ordered from top to bottom lexicographically, i.e. each row is lexicographically no larger than the following one. Determine the minimum number of operations of removing a column needed to make a given table good. Input The first line contains two integers — n and m (1 ≤ n, m ≤ 100). Next n lines contain m small English letters each — the characters of the table. Output Print a single number — the minimum number of columns that you need to remove in order to make the table good. Examples Input 1 10 codeforces Output 0 Input 4 4 case care test code Output 2 Input 5 4 code forc esco defo rces Output 4 Note In the first sample the table is already good. In the second sample you may remove the first and third column. In the third sample you have to remove all the columns (note that the table where all rows are empty is considered good by definition). Let strings s and t have equal length. Then, s is lexicographically larger than t if they are not equal and the character following the largest common prefix of s and t (the prefix may be empty) in s is alphabetically larger than the corresponding character of t. Submitted Solution: ``` n, m = [int(x) for x in input().split()] rs = [input() for _ in range(n)] mask = [1] * m def get_masked(x): return ''.join(y for y, m in zip(x, mask) if m) res = 0 for i in range(m): l = [get_masked(x)[:i - res + 1] for x in rs] if not all(l[i] <= l[i+1] for i in range(len(l)-1)): mask[i] = 0 res += 1 print(res) ``` Yes
23,286
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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. You are given an n × m rectangular table consisting of lower case English letters. In one operation you can completely remove one column from the table. The remaining parts are combined forming a new table. For example, after removing the second column from the table abcd edfg hijk we obtain the table: acd efg hjk A table is called good if its rows are ordered from top to bottom lexicographically, i.e. each row is lexicographically no larger than the following one. Determine the minimum number of operations of removing a column needed to make a given table good. Input The first line contains two integers — n and m (1 ≤ n, m ≤ 100). Next n lines contain m small English letters each — the characters of the table. Output Print a single number — the minimum number of columns that you need to remove in order to make the table good. Examples Input 1 10 codeforces Output 0 Input 4 4 case care test code Output 2 Input 5 4 code forc esco defo rces Output 4 Note In the first sample the table is already good. In the second sample you may remove the first and third column. In the third sample you have to remove all the columns (note that the table where all rows are empty is considered good by definition). Let strings s and t have equal length. Then, s is lexicographically larger than t if they are not equal and the character following the largest common prefix of s and t (the prefix may be empty) in s is alphabetically larger than the corresponding character of t. Submitted Solution: ``` n, m = map(int, input().split()) grid = [] for _ in range(n): grid.append(list(input())) deleted = 0 last = [] for j in range(m): for i in range(1,n): if grid[i][j] < grid[i-1][j] and len(last) == 0: deleted += 1 break elif len(last) and grid[i][j] < grid[i-1][j]: if ''.join(grid[i-1][x] for x in last+[j]) > ''.join(grid[i][x] for x in last+[j]): deleted += 1 break else: last.append(j) print(deleted) ``` Yes
23,287
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Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. You are given an n × m rectangular table consisting of lower case English letters. In one operation you can completely remove one column from the table. The remaining parts are combined forming a new table. For example, after removing the second column from the table abcd edfg hijk we obtain the table: acd efg hjk A table is called good if its rows are ordered from top to bottom lexicographically, i.e. each row is lexicographically no larger than the following one. Determine the minimum number of operations of removing a column needed to make a given table good. Input The first line contains two integers — n and m (1 ≤ n, m ≤ 100). Next n lines contain m small English letters each — the characters of the table. Output Print a single number — the minimum number of columns that you need to remove in order to make the table good. Examples Input 1 10 codeforces Output 0 Input 4 4 case care test code Output 2 Input 5 4 code forc esco defo rces Output 4 Note In the first sample the table is already good. In the second sample you may remove the first and third column. In the third sample you have to remove all the columns (note that the table where all rows are empty is considered good by definition). Let strings s and t have equal length. Then, s is lexicographically larger than t if they are not equal and the character following the largest common prefix of s and t (the prefix may be empty) in s is alphabetically larger than the corresponding character of t. Submitted Solution: ``` import sys from collections import deque import math input_ = lambda: sys.stdin.readline().strip("\r\n") ii = lambda : int(input_()) il = lambda : list(map(int, input_().split())) ilf = lambda : list(map(float, input_().split())) ip = lambda : input_() fi = lambda : float(input_()) li = lambda : list(input_()) pr = lambda x : print(x) f = lambda : sys.stdout.flush() n,m = il() ans = 0 a = [] for _ in range(n) : a.append(ip()) b = ['' for _ in range (n)] for i in range (m) : c = [] for j in range(n) : c.append(b[j]+a[j][i]) if (c == sorted(c)) : if len(c) == len(set(c)) : break else : b = c else : ans += 1 print(ans) ``` Yes
23,288
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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. You are given an n × m rectangular table consisting of lower case English letters. In one operation you can completely remove one column from the table. The remaining parts are combined forming a new table. For example, after removing the second column from the table abcd edfg hijk we obtain the table: acd efg hjk A table is called good if its rows are ordered from top to bottom lexicographically, i.e. each row is lexicographically no larger than the following one. Determine the minimum number of operations of removing a column needed to make a given table good. Input The first line contains two integers — n and m (1 ≤ n, m ≤ 100). Next n lines contain m small English letters each — the characters of the table. Output Print a single number — the minimum number of columns that you need to remove in order to make the table good. Examples Input 1 10 codeforces Output 0 Input 4 4 case care test code Output 2 Input 5 4 code forc esco defo rces Output 4 Note In the first sample the table is already good. In the second sample you may remove the first and third column. In the third sample you have to remove all the columns (note that the table where all rows are empty is considered good by definition). Let strings s and t have equal length. Then, s is lexicographically larger than t if they are not equal and the character following the largest common prefix of s and t (the prefix may be empty) in s is alphabetically larger than the corresponding character of t. Submitted Solution: ``` def remove(p, a): for i in range(len(a)): a[i] = a[i][: p] + a[i][p + 1: ] n, m = [int(x) for x in input().split()] a = [] for i in range(n): a.append(input()) removed = 0 for i in range(m): i -= removed for j in range(n - 1): if a[j][: i + 1] > a[j + 1][: i + 1]: remove(i, a) removed += 1 break print(removed) # Made By Mostafa_Khaled ``` Yes
23,289
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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. You are given an n × m rectangular table consisting of lower case English letters. In one operation you can completely remove one column from the table. The remaining parts are combined forming a new table. For example, after removing the second column from the table abcd edfg hijk we obtain the table: acd efg hjk A table is called good if its rows are ordered from top to bottom lexicographically, i.e. each row is lexicographically no larger than the following one. Determine the minimum number of operations of removing a column needed to make a given table good. Input The first line contains two integers — n and m (1 ≤ n, m ≤ 100). Next n lines contain m small English letters each — the characters of the table. Output Print a single number — the minimum number of columns that you need to remove in order to make the table good. Examples Input 1 10 codeforces Output 0 Input 4 4 case care test code Output 2 Input 5 4 code forc esco defo rces Output 4 Note In the first sample the table is already good. In the second sample you may remove the first and third column. In the third sample you have to remove all the columns (note that the table where all rows are empty is considered good by definition). Let strings s and t have equal length. Then, s is lexicographically larger than t if they are not equal and the character following the largest common prefix of s and t (the prefix may be empty) in s is alphabetically larger than the corresponding character of t. Submitted Solution: ``` #!/usr/bin/env python3 n, m = map(int, input().split()) table = [[c for c in input()] for i in range(n)] def is_good_column(c, adj): flag = False for i in range(n - 1): if (not adj or (adj and table[i][adj] == table[i+1][adj])) and table[i][c] > table[i+1][c]: return False, False elif table[i][c] == table[i+1][c]: flag = True return True, flag i = 0 need = m count = 0 adj = None while i < need: flag, dup = is_good_column(i, adj) if flag: adj = i if not dup: break else: count += 1 need = min(i + 2, m) i += 1 print(count) ``` No
23,290
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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. You are given an n × m rectangular table consisting of lower case English letters. In one operation you can completely remove one column from the table. The remaining parts are combined forming a new table. For example, after removing the second column from the table abcd edfg hijk we obtain the table: acd efg hjk A table is called good if its rows are ordered from top to bottom lexicographically, i.e. each row is lexicographically no larger than the following one. Determine the minimum number of operations of removing a column needed to make a given table good. Input The first line contains two integers — n and m (1 ≤ n, m ≤ 100). Next n lines contain m small English letters each — the characters of the table. Output Print a single number — the minimum number of columns that you need to remove in order to make the table good. Examples Input 1 10 codeforces Output 0 Input 4 4 case care test code Output 2 Input 5 4 code forc esco defo rces Output 4 Note In the first sample the table is already good. In the second sample you may remove the first and third column. In the third sample you have to remove all the columns (note that the table where all rows are empty is considered good by definition). Let strings s and t have equal length. Then, s is lexicographically larger than t if they are not equal and the character following the largest common prefix of s and t (the prefix may be empty) in s is alphabetically larger than the corresponding character of t. Submitted Solution: ``` # from itertools import combinations # from bisect import bisect_left # from functools import * # from collections import Counter def is_lexigraphic(s): for i in range(len(s) - 1): if s[i] > s[i + 1]: return False return True I = lambda: list(map(int, input().split())) n, m = I() a = [input() for i in range(n)] mn = m columns = list(zip(*a)) for i in range(m): curCol = columns[i] if not is_lexigraphic(curCol): continue l = [] for j in range(n - 1): if curCol[j] == curCol[j + 1]: l.append((j, j + 1)) x = 0 for k in range(i + 1, m): if any([columns[k][a] > columns[k][b] for a, b in l]): x += 1 else: break mn = min(x + i, mn) print(mn) ``` No
23,291
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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. You are given an n × m rectangular table consisting of lower case English letters. In one operation you can completely remove one column from the table. The remaining parts are combined forming a new table. For example, after removing the second column from the table abcd edfg hijk we obtain the table: acd efg hjk A table is called good if its rows are ordered from top to bottom lexicographically, i.e. each row is lexicographically no larger than the following one. Determine the minimum number of operations of removing a column needed to make a given table good. Input The first line contains two integers — n and m (1 ≤ n, m ≤ 100). Next n lines contain m small English letters each — the characters of the table. Output Print a single number — the minimum number of columns that you need to remove in order to make the table good. Examples Input 1 10 codeforces Output 0 Input 4 4 case care test code Output 2 Input 5 4 code forc esco defo rces Output 4 Note In the first sample the table is already good. In the second sample you may remove the first and third column. In the third sample you have to remove all the columns (note that the table where all rows are empty is considered good by definition). Let strings s and t have equal length. Then, s is lexicographically larger than t if they are not equal and the character following the largest common prefix of s and t (the prefix may be empty) in s is alphabetically larger than the corresponding character of t. Submitted Solution: ``` from itertools import combinations, permutations def is_good(s,n,m): for i in range(n-1): if s[i] > s[i+1]: return False return True def main2(n,m,a): if n <= 0 or m<=0 or is_good(a,n,m): print(0) return for i in range(1,m): p = combinations(range(m),i) for j in p: s = ["".join([k for b,k in enumerate(x) if b not in j]) for x in a] if is_good(s,n,m-i): print(i) return print(m) def main3(n,m,a): if n <= 1 or m<=0 or is_good(a,n,m): print(0) return bad = [] for i in range(0,m): if not is_good(["".join([k for b,k in enumerate(x) if b!=i]) for x in a],n,m): bad.append(i) for i in range(1,len(bad)+1): p = combinations(bad,i) for j in p: s = ["".join([k for b,k in enumerate(x) if b not in j]) for x in a] if is_good(s,n,m-i): print(i) return print(m) def main4(n,m,a): if n <= 1 or m<=0 or is_good(a,n,m): print(0) return bad = [] for i in range(0,m): if not is_good(["".join([k for b,k in enumerate(x) if b!=i]) for x in a],n,m): bad.append(i) p = [] for i in bad: p.append(i) s = ["".join([k for b,k in enumerate(x) if b not in p]) for x in a] if is_good(s,n,m-i): print(i) return print(m) def line_is_good(a,j): for i in range(len(a)-1): if a[i][j] > a[i+1][j]: return False return True def main(n,m,a): if n <= 1 or m<=0 or is_good(a,n,m): print(0) return bad = [] for i in range(0,m): if line_is_good(a,i): continue bad.append(i) print(i) s = ["".join([k for b,k in enumerate(x) if b not in bad]) for x in a] if is_good(s,n,m-len(bad)): print(len(bad)) return print(m) def main_input(): n,m = [int(i) for i in input().split()] a = [input() for s in range(n)] main(n,m,a) if __name__ == "__main__": main_input() ``` No
23,292
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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. You are given an n × m rectangular table consisting of lower case English letters. In one operation you can completely remove one column from the table. The remaining parts are combined forming a new table. For example, after removing the second column from the table abcd edfg hijk we obtain the table: acd efg hjk A table is called good if its rows are ordered from top to bottom lexicographically, i.e. each row is lexicographically no larger than the following one. Determine the minimum number of operations of removing a column needed to make a given table good. Input The first line contains two integers — n and m (1 ≤ n, m ≤ 100). Next n lines contain m small English letters each — the characters of the table. Output Print a single number — the minimum number of columns that you need to remove in order to make the table good. Examples Input 1 10 codeforces Output 0 Input 4 4 case care test code Output 2 Input 5 4 code forc esco defo rces Output 4 Note In the first sample the table is already good. In the second sample you may remove the first and third column. In the third sample you have to remove all the columns (note that the table where all rows are empty is considered good by definition). Let strings s and t have equal length. Then, s is lexicographically larger than t if they are not equal and the character following the largest common prefix of s and t (the prefix may be empty) in s is alphabetically larger than the corresponding character of t. Submitted Solution: ``` from itertools import combinations, permutations def is_good(s,n,m): for i in range(n-1): if s[i] > s[i+1]: return False return True def main2(n,m,a): if n <= 0 or m<=0 or is_good(a,n,m): print(0) return for i in range(1,m): p = combinations(range(m),i) for j in p: s = ["".join([k for b,k in enumerate(x) if b not in j]) for x in a] if is_good(s,n,m-i): print(i) return print(m) def main(n,m,a): if n <= 0 or m<=0 or is_good(a,n,m): print(0) return bad = [] for i in range(0,m): if not is_good(["".join([k for b,k in enumerate(x) if b!=i]) for x in a],n,m): bad.append(i) for i in range(1,m): p = combinations(bad,i) for j in p: s = ["".join([k for b,k in enumerate(x) if b not in j]) for x in a] if is_good(s,n,m-i): print(i) return print(m) def main_input(): n,m = [int(i) for i in input().split()] a = [input() for s in range(n)] main(n,m,a) if __name__ == "__main__": main_input() ``` No
23,293
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Polycarp is working on a new operating system called BerOS. He asks you to help with implementation of a file suggestion feature. There are n files on hard drive and their names are f_1, f_2, ..., f_n. Any file name contains between 1 and 8 characters, inclusive. All file names are unique. The file suggestion feature handles queries, each represented by a string s. For each query s it should count number of files containing s as a substring (i.e. some continuous segment of characters in a file name equals s) and suggest any such file name. For example, if file names are "read.me", "hosts", "ops", and "beros.18", and the query is "os", the number of matched files is 2 (two file names contain "os" as a substring) and suggested file name can be either "hosts" or "beros.18". Input The first line of the input contains integer n (1 ≤ n ≤ 10000) — the total number of files. The following n lines contain file names, one per line. The i-th line contains f_i — the name of the i-th file. Each file name contains between 1 and 8 characters, inclusive. File names contain only lowercase Latin letters, digits and dot characters ('.'). Any sequence of valid characters can be a file name (for example, in BerOS ".", ".." and "..." are valid file names). All file names are unique. The following line contains integer q (1 ≤ q ≤ 50000) — the total number of queries. The following q lines contain queries s_1, s_2, ..., s_q, one per line. Each s_j has length between 1 and 8 characters, inclusive. It contains only lowercase Latin letters, digits and dot characters ('.'). Output Print q lines, one per query. The j-th line should contain the response on the j-th query — two values c_j and t_j, where * c_j is the number of matched files for the j-th query, * t_j is the name of any file matched by the j-th query. If there is no such file, print a single character '-' instead. If there are multiple matched files, print any. Example Input 4 test contests test. .test 6 ts . st. .test contes. st Output 1 contests 2 .test 1 test. 1 .test 0 - 4 test. Tags: brute force, implementation Correct Solution: ``` import re import sys exit=sys.exit from bisect import bisect_left as bsl,bisect_right as bsr from collections import Counter,defaultdict as ddict,deque from functools import lru_cache cache=lru_cache(None) from heapq import * from itertools import * from math import inf from pprint import pprint as pp enum=enumerate ri=lambda:int(rln()) ris=lambda:list(map(int,rfs())) rln=sys.stdin.readline rl=lambda:rln().rstrip('\n') rfs=lambda:rln().split() mod=1000000007 d4=[(0,-1),(1,0),(0,1),(-1,0)] d8=[(-1,-1),(0,-1),(1,-1),(-1,0),(1,0),(-1,1),(0,1),(1,1)] ######################################################################## n=ri() d=ddict(lambda:[0,'']) for _ in range(n): s=rl() k=len(s) S=set() for i in range(k): for j in range(i,k): S.add(s[i:j+1]) for t in S: d[t][0]+=1 if d[t][0]==1: d[t][1]=s q=ri() for _ in range(q): s=rl() if s not in d: print(0,'-') continue print(*d[s]) ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Polycarp is working on a new operating system called BerOS. He asks you to help with implementation of a file suggestion feature. There are n files on hard drive and their names are f_1, f_2, ..., f_n. Any file name contains between 1 and 8 characters, inclusive. All file names are unique. The file suggestion feature handles queries, each represented by a string s. For each query s it should count number of files containing s as a substring (i.e. some continuous segment of characters in a file name equals s) and suggest any such file name. For example, if file names are "read.me", "hosts", "ops", and "beros.18", and the query is "os", the number of matched files is 2 (two file names contain "os" as a substring) and suggested file name can be either "hosts" or "beros.18". Input The first line of the input contains integer n (1 ≤ n ≤ 10000) — the total number of files. The following n lines contain file names, one per line. The i-th line contains f_i — the name of the i-th file. Each file name contains between 1 and 8 characters, inclusive. File names contain only lowercase Latin letters, digits and dot characters ('.'). Any sequence of valid characters can be a file name (for example, in BerOS ".", ".." and "..." are valid file names). All file names are unique. The following line contains integer q (1 ≤ q ≤ 50000) — the total number of queries. The following q lines contain queries s_1, s_2, ..., s_q, one per line. Each s_j has length between 1 and 8 characters, inclusive. It contains only lowercase Latin letters, digits and dot characters ('.'). Output Print q lines, one per query. The j-th line should contain the response on the j-th query — two values c_j and t_j, where * c_j is the number of matched files for the j-th query, * t_j is the name of any file matched by the j-th query. If there is no such file, print a single character '-' instead. If there are multiple matched files, print any. Example Input 4 test contests test. .test 6 ts . st. .test contes. st Output 1 contests 2 .test 1 test. 1 .test 0 - 4 test. Tags: brute force, implementation Correct Solution: ``` # -*- coding:utf-8 -*- """ created by shuangquan.huang at 11/3/18 """ import collections N = int(input()) subs = collections.defaultdict(int) subi = collections.defaultdict(int) files = [] for fi in range(N): f = input() files.append(f) ss = set() for i in range(len(f)): for j in range(i+1, len(f)+1): s = f[i: j] ss.add(s) subi[s] = fi for s in ss: subs[s] += 1 Q = int(input()) qs = [input() for _ in range(Q)] ans = [] for s in qs: count = subs[s] af = files[subi[s]] if count > 0 else '-' ans.append('{} {}'.format(count, af)) print('\n'.join(ans)) ```
23,866
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Polycarp is working on a new operating system called BerOS. He asks you to help with implementation of a file suggestion feature. There are n files on hard drive and their names are f_1, f_2, ..., f_n. Any file name contains between 1 and 8 characters, inclusive. All file names are unique. The file suggestion feature handles queries, each represented by a string s. For each query s it should count number of files containing s as a substring (i.e. some continuous segment of characters in a file name equals s) and suggest any such file name. For example, if file names are "read.me", "hosts", "ops", and "beros.18", and the query is "os", the number of matched files is 2 (two file names contain "os" as a substring) and suggested file name can be either "hosts" or "beros.18". Input The first line of the input contains integer n (1 ≤ n ≤ 10000) — the total number of files. The following n lines contain file names, one per line. The i-th line contains f_i — the name of the i-th file. Each file name contains between 1 and 8 characters, inclusive. File names contain only lowercase Latin letters, digits and dot characters ('.'). Any sequence of valid characters can be a file name (for example, in BerOS ".", ".." and "..." are valid file names). All file names are unique. The following line contains integer q (1 ≤ q ≤ 50000) — the total number of queries. The following q lines contain queries s_1, s_2, ..., s_q, one per line. Each s_j has length between 1 and 8 characters, inclusive. It contains only lowercase Latin letters, digits and dot characters ('.'). Output Print q lines, one per query. The j-th line should contain the response on the j-th query — two values c_j and t_j, where * c_j is the number of matched files for the j-th query, * t_j is the name of any file matched by the j-th query. If there is no such file, print a single character '-' instead. If there are multiple matched files, print any. Example Input 4 test contests test. .test 6 ts . st. .test contes. st Output 1 contests 2 .test 1 test. 1 .test 0 - 4 test. Tags: brute force, implementation Correct Solution: ``` def func1(s,i,index,dict1): if(i==len(s)): return sx='' for j in range(i,len(s)): sx+=s[j] try: if(dict1[sx][1]!=index): dict1[sx][0]+=1 dict1[sx][1]=index except: KeyError dict1[sx]=[1,index] func1(s,i+1,index,dict1) return n=int(input()) arr=[] dict1={} for i in range(n): s=str(input()) arr.append(s) func1(s,0,i,dict1) q=int(input()) for i in range(q): s=str(input()) #print(dict1['ts']) try: val1=dict1[s][0] val2=arr[dict1[s][1]] print(val1,val2) except: KeyError print(0,'-') ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Polycarp is working on a new operating system called BerOS. He asks you to help with implementation of a file suggestion feature. There are n files on hard drive and their names are f_1, f_2, ..., f_n. Any file name contains between 1 and 8 characters, inclusive. All file names are unique. The file suggestion feature handles queries, each represented by a string s. For each query s it should count number of files containing s as a substring (i.e. some continuous segment of characters in a file name equals s) and suggest any such file name. For example, if file names are "read.me", "hosts", "ops", and "beros.18", and the query is "os", the number of matched files is 2 (two file names contain "os" as a substring) and suggested file name can be either "hosts" or "beros.18". Input The first line of the input contains integer n (1 ≤ n ≤ 10000) — the total number of files. The following n lines contain file names, one per line. The i-th line contains f_i — the name of the i-th file. Each file name contains between 1 and 8 characters, inclusive. File names contain only lowercase Latin letters, digits and dot characters ('.'). Any sequence of valid characters can be a file name (for example, in BerOS ".", ".." and "..." are valid file names). All file names are unique. The following line contains integer q (1 ≤ q ≤ 50000) — the total number of queries. The following q lines contain queries s_1, s_2, ..., s_q, one per line. Each s_j has length between 1 and 8 characters, inclusive. It contains only lowercase Latin letters, digits and dot characters ('.'). Output Print q lines, one per query. The j-th line should contain the response on the j-th query — two values c_j and t_j, where * c_j is the number of matched files for the j-th query, * t_j is the name of any file matched by the j-th query. If there is no such file, print a single character '-' instead. If there are multiple matched files, print any. Example Input 4 test contests test. .test 6 ts . st. .test contes. st Output 1 contests 2 .test 1 test. 1 .test 0 - 4 test. Tags: brute force, implementation Correct Solution: ``` ## necessary imports import sys input = sys.stdin.readline from math import ceil, floor, factorial; # swap_array function def swaparr(arr, a,b): temp = arr[a]; arr[a] = arr[b]; arr[b] = temp ## gcd function def gcd(a,b): if a == 0: return b return gcd(b%a, a) ## nCr function efficient using Binomial Cofficient def nCr(n, k): if(k > n - k): k = n - k res = 1 for i in range(k): res = res * (n - i) res = res / (i + 1) return int(res) ## upper bound function code -- such that e in a[:i] e < x; def upper_bound(a, x, lo=0): hi = len(a) while lo < hi: mid = (lo+hi)//2 if a[mid] < x: lo = mid+1 else: hi = mid return lo ## prime factorization def primefs(n): ## if n == 1 ## calculating primes primes = {} while(n%2 == 0): primes[2] = primes.get(2, 0) + 1 n = n//2 for i in range(3, int(n**0.5)+2, 2): while(n%i == 0): primes[i] = primes.get(i, 0) + 1 n = n//i if n > 2: primes[n] = primes.get(n, 0) + 1 ## prime factoriazation of n is stored in dictionary ## primes and can be accesed. O(sqrt n) return primes ## MODULAR EXPONENTIATION FUNCTION 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 x = (x * x) % p return res ## DISJOINT SET UNINON FUNCTIONS def swap(a,b): temp = a a = b b = temp return a,b # find function with path compression included (recursive) # def find(x, link): # if link[x] == x: # return x # link[x] = find(link[x], link); # return link[x]; # find function with path compression (ITERATIVE) def find(x, link): p = x; while( p != link[p]): p = link[p]; while( x != p): nex = link[x]; link[x] = p; x = nex; return p; # the union function which makes union(x,y) # of two nodes x and y def union(x, y, link, size): x = find(x, link) y = find(y, link) if size[x] < size[y]: x,y = swap(x,y) if x != y: size[x] += size[y] link[y] = x ## returns an array of boolean if primes or not USING SIEVE OF ERATOSTHANES def sieve(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 #### PRIME FACTORIZATION IN O(log n) using Sieve #### MAXN = int(1e6 + 5) def spf_sieve(): 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, ceil(MAXN ** 0.5), 2): if spf[i] == i: for j in range(i*i, MAXN, i): if spf[j] == j: spf[j] = i; ## function for storing smallest prime factors (spf) in the array ################## un-comment below 2 lines when using factorization ################# # spf = [0 for i in range(MAXN)] # spf_sieve() def factoriazation(x): ret = {}; while x != 1: ret[spf[x]] = ret.get(spf[x], 0) + 1; x = x//spf[x] return ret ## this function is useful for multiple queries only, o/w use ## primefs function above. complexity O(log n) ## taking integer array input def int_array(): return list(map(int, input().strip().split())) ## taking string array input def str_array(): return input().strip().split(); #defining a couple constants MOD = int(1e9)+7; CMOD = 998244353; INF = float('inf'); NINF = -float('inf'); ################### ---------------- TEMPLATE ENDS HERE ---------------- ################### count = {}; dick = {}; n = int(input()); for __ in range(n): s = input().strip(); this = set(); for i in range(len(s)): x = ''; for j in range(i, len(s)): x += s[j]; if x in this: continue; this.add(x); dick[x] = s; count[x] = count.get(x, 0) + 1; q = int(input()); for __ in range(q): s = input().strip(); if s in dick: x = count[s]; y = dick[s]; else: x = 0; y = '-'; print(*(x, y)); ```
23,868
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Polycarp is working on a new operating system called BerOS. He asks you to help with implementation of a file suggestion feature. There are n files on hard drive and their names are f_1, f_2, ..., f_n. Any file name contains between 1 and 8 characters, inclusive. All file names are unique. The file suggestion feature handles queries, each represented by a string s. For each query s it should count number of files containing s as a substring (i.e. some continuous segment of characters in a file name equals s) and suggest any such file name. For example, if file names are "read.me", "hosts", "ops", and "beros.18", and the query is "os", the number of matched files is 2 (two file names contain "os" as a substring) and suggested file name can be either "hosts" or "beros.18". Input The first line of the input contains integer n (1 ≤ n ≤ 10000) — the total number of files. The following n lines contain file names, one per line. The i-th line contains f_i — the name of the i-th file. Each file name contains between 1 and 8 characters, inclusive. File names contain only lowercase Latin letters, digits and dot characters ('.'). Any sequence of valid characters can be a file name (for example, in BerOS ".", ".." and "..." are valid file names). All file names are unique. The following line contains integer q (1 ≤ q ≤ 50000) — the total number of queries. The following q lines contain queries s_1, s_2, ..., s_q, one per line. Each s_j has length between 1 and 8 characters, inclusive. It contains only lowercase Latin letters, digits and dot characters ('.'). Output Print q lines, one per query. The j-th line should contain the response on the j-th query — two values c_j and t_j, where * c_j is the number of matched files for the j-th query, * t_j is the name of any file matched by the j-th query. If there is no such file, print a single character '-' instead. If there are multiple matched files, print any. Example Input 4 test contests test. .test 6 ts . st. .test contes. st Output 1 contests 2 .test 1 test. 1 .test 0 - 4 test. Tags: brute force, implementation Correct Solution: ``` if __name__ == "__main__": Map = {} siz = {} n = int(input()) for i in range(n): str = input() MMap = {} for j in range(0,len(str)): t = "" for k in range(j,len(str)): t += str[k] MMap[t] = 1 for x in MMap: if not x in Map: Map[x] = str siz[x] = 0 siz[x] +=1 #for x in Map: #print(x,Map[x]) q = int(input()) for i in range(q): str = input() if str in Map: print(siz[str], Map[str]) else: print("0 -") ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Polycarp is working on a new operating system called BerOS. He asks you to help with implementation of a file suggestion feature. There are n files on hard drive and their names are f_1, f_2, ..., f_n. Any file name contains between 1 and 8 characters, inclusive. All file names are unique. The file suggestion feature handles queries, each represented by a string s. For each query s it should count number of files containing s as a substring (i.e. some continuous segment of characters in a file name equals s) and suggest any such file name. For example, if file names are "read.me", "hosts", "ops", and "beros.18", and the query is "os", the number of matched files is 2 (two file names contain "os" as a substring) and suggested file name can be either "hosts" or "beros.18". Input The first line of the input contains integer n (1 ≤ n ≤ 10000) — the total number of files. The following n lines contain file names, one per line. The i-th line contains f_i — the name of the i-th file. Each file name contains between 1 and 8 characters, inclusive. File names contain only lowercase Latin letters, digits and dot characters ('.'). Any sequence of valid characters can be a file name (for example, in BerOS ".", ".." and "..." are valid file names). All file names are unique. The following line contains integer q (1 ≤ q ≤ 50000) — the total number of queries. The following q lines contain queries s_1, s_2, ..., s_q, one per line. Each s_j has length between 1 and 8 characters, inclusive. It contains only lowercase Latin letters, digits and dot characters ('.'). Output Print q lines, one per query. The j-th line should contain the response on the j-th query — two values c_j and t_j, where * c_j is the number of matched files for the j-th query, * t_j is the name of any file matched by the j-th query. If there is no such file, print a single character '-' instead. If there are multiple matched files, print any. Example Input 4 test contests test. .test 6 ts . st. .test contes. st Output 1 contests 2 .test 1 test. 1 .test 0 - 4 test. Tags: brute force, implementation Correct Solution: ``` ################### # 18th August 2019. ################### ########################################################################## # Getting fileCount from Codeforces. fileCount = int(input()) # Method to generate all substrings of given string. from itertools import combinations as cmb def generateSubstringsFor(string): length = len(string) + 1 return [string[x:y] for x, y in cmb(range(length), r=2)] # HashMap mapping substrings to set of containing strings. stringMap = {} for i in range(fileCount): newFile = input() # Generating entry for new file. for string in generateSubstringsFor(newFile): # Case Set has been created. if not string in stringMap: stringMap[string] = set([newFile]) # Case First Entry. else: stringMap[string].add(newFile) # Method to entertain a single query. def outputForQuery(query): if query in stringMap: return str(len(stringMap[query]))+" "+next(iter(stringMap[query])) else: return "0 - " # We now entertain all requests from Codeforces. queryCount = int(input()) for i in range(queryCount): print(outputForQuery(input())) ########################################################################## ######################################## # Programming-Credits atifcppprogrammer. ######################################## ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Polycarp is working on a new operating system called BerOS. He asks you to help with implementation of a file suggestion feature. There are n files on hard drive and their names are f_1, f_2, ..., f_n. Any file name contains between 1 and 8 characters, inclusive. All file names are unique. The file suggestion feature handles queries, each represented by a string s. For each query s it should count number of files containing s as a substring (i.e. some continuous segment of characters in a file name equals s) and suggest any such file name. For example, if file names are "read.me", "hosts", "ops", and "beros.18", and the query is "os", the number of matched files is 2 (two file names contain "os" as a substring) and suggested file name can be either "hosts" or "beros.18". Input The first line of the input contains integer n (1 ≤ n ≤ 10000) — the total number of files. The following n lines contain file names, one per line. The i-th line contains f_i — the name of the i-th file. Each file name contains between 1 and 8 characters, inclusive. File names contain only lowercase Latin letters, digits and dot characters ('.'). Any sequence of valid characters can be a file name (for example, in BerOS ".", ".." and "..." are valid file names). All file names are unique. The following line contains integer q (1 ≤ q ≤ 50000) — the total number of queries. The following q lines contain queries s_1, s_2, ..., s_q, one per line. Each s_j has length between 1 and 8 characters, inclusive. It contains only lowercase Latin letters, digits and dot characters ('.'). Output Print q lines, one per query. The j-th line should contain the response on the j-th query — two values c_j and t_j, where * c_j is the number of matched files for the j-th query, * t_j is the name of any file matched by the j-th query. If there is no such file, print a single character '-' instead. If there are multiple matched files, print any. Example Input 4 test contests test. .test 6 ts . st. .test contes. st Output 1 contests 2 .test 1 test. 1 .test 0 - 4 test. Tags: brute force, implementation Correct Solution: ``` from collections import defaultdict N = int(input()) F = [] for i in range(N): F.append(input()) dic = defaultdict(set) for i in range(N): t = F[i] M = len(t) for j in range(M): for k in range(j + 1, M + 1): dic[t[j: k]].add(F[i]) Q = int(input()) for i in range(Q): s = input() if s in dic: print(len(dic[s]), list(dic[s])[0]) else: print("0 -") ```
23,871
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Polycarp is working on a new operating system called BerOS. He asks you to help with implementation of a file suggestion feature. There are n files on hard drive and their names are f_1, f_2, ..., f_n. Any file name contains between 1 and 8 characters, inclusive. All file names are unique. The file suggestion feature handles queries, each represented by a string s. For each query s it should count number of files containing s as a substring (i.e. some continuous segment of characters in a file name equals s) and suggest any such file name. For example, if file names are "read.me", "hosts", "ops", and "beros.18", and the query is "os", the number of matched files is 2 (two file names contain "os" as a substring) and suggested file name can be either "hosts" or "beros.18". Input The first line of the input contains integer n (1 ≤ n ≤ 10000) — the total number of files. The following n lines contain file names, one per line. The i-th line contains f_i — the name of the i-th file. Each file name contains between 1 and 8 characters, inclusive. File names contain only lowercase Latin letters, digits and dot characters ('.'). Any sequence of valid characters can be a file name (for example, in BerOS ".", ".." and "..." are valid file names). All file names are unique. The following line contains integer q (1 ≤ q ≤ 50000) — the total number of queries. The following q lines contain queries s_1, s_2, ..., s_q, one per line. Each s_j has length between 1 and 8 characters, inclusive. It contains only lowercase Latin letters, digits and dot characters ('.'). Output Print q lines, one per query. The j-th line should contain the response on the j-th query — two values c_j and t_j, where * c_j is the number of matched files for the j-th query, * t_j is the name of any file matched by the j-th query. If there is no such file, print a single character '-' instead. If there are multiple matched files, print any. Example Input 4 test contests test. .test 6 ts . st. .test contes. st Output 1 contests 2 .test 1 test. 1 .test 0 - 4 test. Tags: brute force, implementation Correct Solution: ``` # https://codeforces.com/problemset/problem/1070/H from sys import stdin, exit from typing import List, Tuple sub_strings = dict() files_num = int(stdin.readline().rstrip()) for _id in range(files_num): f_name = stdin.readline().rstrip() for i in range(len(f_name)): for j in range(i + 1, len(f_name) + 1): key = f_name[i:j] if key not in sub_strings: sub_strings[key] = [1, f_name, _id] else: rez = sub_strings[key] if rez[2] != _id: rez[2] = _id sub_strings[key][0] += 1 queries = int(stdin.readline().rstrip()) for _ in range(queries): query = stdin.readline().rstrip() if query in sub_strings: rez = sub_strings[query] print(rez[0], ' ', rez[1]) else: print(0, ' ', '-') ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. In the popular spreadsheets systems (for example, in Excel) the following numeration of columns is used. The first column has number A, the second — number B, etc. till column 26 that is marked by Z. Then there are two-letter numbers: column 27 has number AA, 28 — AB, column 52 is marked by AZ. After ZZ there follow three-letter numbers, etc. The rows are marked by integer numbers starting with 1. The cell name is the concatenation of the column and the row numbers. For example, BC23 is the name for the cell that is in column 55, row 23. Sometimes another numeration system is used: RXCY, where X and Y are integer numbers, showing the column and the row numbers respectfully. For instance, R23C55 is the cell from the previous example. Your task is to write a program that reads the given sequence of cell coordinates and produce each item written according to the rules of another numeration system. Input The first line of the input contains integer number n (1 ≤ n ≤ 105), the number of coordinates in the test. Then there follow n lines, each of them contains coordinates. All the coordinates are correct, there are no cells with the column and/or the row numbers larger than 106 . Output Write n lines, each line should contain a cell coordinates in the other numeration system. Examples Input 2 R23C55 BC23 Output BC23 R23C55 Tags: implementation, math Correct Solution: ``` import string import re alphabet=string.ascii_uppercase n=input() n=int(n) def numer1(inp): inp=inp.replace("R","") inp=inp.replace("C"," ") row,column=inp.split(" ",1) column=int(column) columnalpha=[] over=False while not over: a=(column-1)//26 b=column-a*26 if b==0: b=26 column=a columnalpha.insert(0,alphabet[b-1]) if column==0: over=True print("".join(columnalpha)+row) def numer2(inp): row="".join(list(filter(str.isdigit,inp))) columnalpha=list(filter(str.isalpha,inp)) column=0 for i in range(0,len(columnalpha)): column+=(alphabet.index(columnalpha[i])+1)*26**(len(columnalpha)-1-i) column=str(column) print("R"+row+"C"+column) for i in range(0,n): inp=input() numertypeR=len(re.findall(r"R"+"\d",inp)) numertypeC=len(re.findall(r"C"+"\d",inp)) if numertypeR==1 and numertypeC==1: numer1(inp) else: numer2(inp) ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Email address in Berland is a string of the form A@B, where A and B are arbitrary strings consisting of small Latin letters. Bob is a system administrator in «Bersoft» company. He keeps a list of email addresses of the company's staff. This list is as a large string, where all addresses are written in arbitrary order, separated by commas. The same address can be written more than once. Suddenly, because of unknown reasons, all commas in Bob's list disappeared. Now Bob has a string, where all addresses are written one after another without any separators, and there is impossible to determine, where the boundaries between addresses are. Unfortunately, on the same day his chief asked him to bring the initial list of addresses. Now Bob wants to disjoin addresses in some valid way. Help him to do that. Input The first line contains the list of addresses without separators. The length of this string is between 1 and 200, inclusive. The string consists only from small Latin letters and characters «@». Output If there is no list of the valid (according to the Berland rules) email addresses such that after removing all commas it coincides with the given string, output No solution. In the other case, output the list. The same address can be written in this list more than once. If there are several solutions, output any of them. Examples Input a@aa@a Output a@a,a@a Input a@a@a Output No solution Input @aa@a Output No solution Tags: greedy, implementation, strings Correct Solution: ``` s=input() au=[pos for pos,char in enumerate(s) if char=='@'] dis=[au[i+1]-au[i] for i in range(len(au)-1)] dis=[1 for i in dis if i<=2] if len(au)==0 or au[0]==0 or au[-1]==len(s)-1 or sum(dis)>0: print("No solution") else: if len(au)==1: print(s) else: res=[] i=0 j=0 m=au[j]+2 while j<len(au): res.append(s[i:m]) i=m if i>len(s): break j+=1 if j==len(au)-1: m=len(s)+1 else: m=au[j]+2 print(*res,sep=",") ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Email address in Berland is a string of the form A@B, where A and B are arbitrary strings consisting of small Latin letters. Bob is a system administrator in «Bersoft» company. He keeps a list of email addresses of the company's staff. This list is as a large string, where all addresses are written in arbitrary order, separated by commas. The same address can be written more than once. Suddenly, because of unknown reasons, all commas in Bob's list disappeared. Now Bob has a string, where all addresses are written one after another without any separators, and there is impossible to determine, where the boundaries between addresses are. Unfortunately, on the same day his chief asked him to bring the initial list of addresses. Now Bob wants to disjoin addresses in some valid way. Help him to do that. Input The first line contains the list of addresses without separators. The length of this string is between 1 and 200, inclusive. The string consists only from small Latin letters and characters «@». Output If there is no list of the valid (according to the Berland rules) email addresses such that after removing all commas it coincides with the given string, output No solution. In the other case, output the list. The same address can be written in this list more than once. If there are several solutions, output any of them. Examples Input a@aa@a Output a@a,a@a Input a@a@a Output No solution Input @aa@a Output No solution Tags: greedy, implementation, strings Correct Solution: ``` #amros s=input() t=[] k=0 y=1 while 1: a=s.find('@',k+1) if a<0:break r=s[k:a+2] if r.count('@')==0 or r[0]=='@'or r[-1]=='@':y=0 t+=[r];k=a+2 if t and s[k:].count('@')==0:t[-1]+=s[k:] p='' for i in t:p+=i print(['No solution',','.join(t)][p==s and y]) ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Email address in Berland is a string of the form A@B, where A and B are arbitrary strings consisting of small Latin letters. Bob is a system administrator in «Bersoft» company. He keeps a list of email addresses of the company's staff. This list is as a large string, where all addresses are written in arbitrary order, separated by commas. The same address can be written more than once. Suddenly, because of unknown reasons, all commas in Bob's list disappeared. Now Bob has a string, where all addresses are written one after another without any separators, and there is impossible to determine, where the boundaries between addresses are. Unfortunately, on the same day his chief asked him to bring the initial list of addresses. Now Bob wants to disjoin addresses in some valid way. Help him to do that. Input The first line contains the list of addresses without separators. The length of this string is between 1 and 200, inclusive. The string consists only from small Latin letters and characters «@». Output If there is no list of the valid (according to the Berland rules) email addresses such that after removing all commas it coincides with the given string, output No solution. In the other case, output the list. The same address can be written in this list more than once. If there are several solutions, output any of them. Examples Input a@aa@a Output a@a,a@a Input a@a@a Output No solution Input @aa@a Output No solution Tags: greedy, implementation, strings Correct Solution: ``` from sys import stdout a=input() c=list(a.split('@')) while '' in c: c.remove('') if a.count('@')==0: exit(print('No solution')) if a.count('@')!=len(c)-1: exit(print('No solution')) if any(len(i)==1 for i in c[1:len(c)-1]): exit(print('No solution')) stdout.write(c[0]+'@') for i in range(1,len(c)-1): stdout.write(c[i][:len(c[i])//2]+','+c[i][len(c[i])//2:]+'@') stdout.write(c[-1]) ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Email address in Berland is a string of the form A@B, where A and B are arbitrary strings consisting of small Latin letters. Bob is a system administrator in «Bersoft» company. He keeps a list of email addresses of the company's staff. This list is as a large string, where all addresses are written in arbitrary order, separated by commas. The same address can be written more than once. Suddenly, because of unknown reasons, all commas in Bob's list disappeared. Now Bob has a string, where all addresses are written one after another without any separators, and there is impossible to determine, where the boundaries between addresses are. Unfortunately, on the same day his chief asked him to bring the initial list of addresses. Now Bob wants to disjoin addresses in some valid way. Help him to do that. Input The first line contains the list of addresses without separators. The length of this string is between 1 and 200, inclusive. The string consists only from small Latin letters and characters «@». Output If there is no list of the valid (according to the Berland rules) email addresses such that after removing all commas it coincides with the given string, output No solution. In the other case, output the list. The same address can be written in this list more than once. If there are several solutions, output any of them. Examples Input a@aa@a Output a@a,a@a Input a@a@a Output No solution Input @aa@a Output No solution Tags: greedy, implementation, strings Correct Solution: ``` a=input().split('@') n=len(a) b=[] if n>=2: for i in range(n): if len(a[i])>int(i!=0 and i!=n-1): if i!=0 and i!=n-1: b.append(a[i-1][min(1,i-1):]+'@'+a[i][0]) elif i==n-1: b.append(a[i-1][min(1,i-1):]+'@'+a[i]) else: print('No solution') break else: c=b[0] for i in range(1,len(b)): c+=','+b[i] print(c) else: print('No solution') ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Email address in Berland is a string of the form A@B, where A and B are arbitrary strings consisting of small Latin letters. Bob is a system administrator in «Bersoft» company. He keeps a list of email addresses of the company's staff. This list is as a large string, where all addresses are written in arbitrary order, separated by commas. The same address can be written more than once. Suddenly, because of unknown reasons, all commas in Bob's list disappeared. Now Bob has a string, where all addresses are written one after another without any separators, and there is impossible to determine, where the boundaries between addresses are. Unfortunately, on the same day his chief asked him to bring the initial list of addresses. Now Bob wants to disjoin addresses in some valid way. Help him to do that. Input The first line contains the list of addresses without separators. The length of this string is between 1 and 200, inclusive. The string consists only from small Latin letters and characters «@». Output If there is no list of the valid (according to the Berland rules) email addresses such that after removing all commas it coincides with the given string, output No solution. In the other case, output the list. The same address can be written in this list more than once. If there are several solutions, output any of them. Examples Input a@aa@a Output a@a,a@a Input a@a@a Output No solution Input @aa@a Output No solution Tags: greedy, implementation, strings Correct Solution: ``` a = input() b = a.split("@") ans = [] flag = True for i in b[1:-1]: if len(i) < 2: flag = False break if len(b) < 2: flag = False if b[0] and b[-1] and flag: ind = 0 index_list = [] str_len = len(a) temp = "" j = 0 ans = [] while j != str_len: temp += a[j] if a[j] == "@": temp += a[j + 1] ans.append(temp) temp = "" j += 1 j += 1 ans[-1] = ans[-1] + temp print(",".join(ans)) else: print("No solution") ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Email address in Berland is a string of the form A@B, where A and B are arbitrary strings consisting of small Latin letters. Bob is a system administrator in «Bersoft» company. He keeps a list of email addresses of the company's staff. This list is as a large string, where all addresses are written in arbitrary order, separated by commas. The same address can be written more than once. Suddenly, because of unknown reasons, all commas in Bob's list disappeared. Now Bob has a string, where all addresses are written one after another without any separators, and there is impossible to determine, where the boundaries between addresses are. Unfortunately, on the same day his chief asked him to bring the initial list of addresses. Now Bob wants to disjoin addresses in some valid way. Help him to do that. Input The first line contains the list of addresses without separators. The length of this string is between 1 and 200, inclusive. The string consists only from small Latin letters and characters «@». Output If there is no list of the valid (according to the Berland rules) email addresses such that after removing all commas it coincides with the given string, output No solution. In the other case, output the list. The same address can be written in this list more than once. If there are several solutions, output any of them. Examples Input a@aa@a Output a@a,a@a Input a@a@a Output No solution Input @aa@a Output No solution Tags: greedy, implementation, strings Correct Solution: ``` import sys from array import array # noqa: F401 def input(): return sys.stdin.buffer.readline().decode('utf-8') s = input().rstrip() ans = [] while s and s[0] != '@': for i in range(len(s) - 1): if s[i] == '@': ans.append(s[:i + 2]) s = s[i + 2:] break else: break if s and '@' not in s and ans: ans[-1] += s s = '' if not s and all(addr.count('@') == 1 for addr in ans): print(','.join(ans)) else: print('No solution') ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Email address in Berland is a string of the form A@B, where A and B are arbitrary strings consisting of small Latin letters. Bob is a system administrator in «Bersoft» company. He keeps a list of email addresses of the company's staff. This list is as a large string, where all addresses are written in arbitrary order, separated by commas. The same address can be written more than once. Suddenly, because of unknown reasons, all commas in Bob's list disappeared. Now Bob has a string, where all addresses are written one after another without any separators, and there is impossible to determine, where the boundaries between addresses are. Unfortunately, on the same day his chief asked him to bring the initial list of addresses. Now Bob wants to disjoin addresses in some valid way. Help him to do that. Input The first line contains the list of addresses without separators. The length of this string is between 1 and 200, inclusive. The string consists only from small Latin letters and characters «@». Output If there is no list of the valid (according to the Berland rules) email addresses such that after removing all commas it coincides with the given string, output No solution. In the other case, output the list. The same address can be written in this list more than once. If there are several solutions, output any of them. Examples Input a@aa@a Output a@a,a@a Input a@a@a Output No solution Input @aa@a Output No solution Tags: greedy, implementation, strings Correct Solution: ``` def cf31B(): #print("Hello World") from sys import stdin,stdout inp = list(stdin.readline().strip().split('@')) flag = True if len(inp)>=2: if len(inp[0])==0 or len(inp[-1])==0: flag = False if flag: for i in range(1,len(inp)-1): if len(inp[i]) < 2: flag = False break else: flag = False answer = "" if flag: for i , j in enumerate(inp): if i==0: answer+=j elif i==len(inp)-1: answer+='@'+j else: answer+='@'+j[:-1]+','+j[-1] else: answer = "No solution" stdout.write(answer+"\n") if __name__=='__main__': cf31B() ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Email address in Berland is a string of the form A@B, where A and B are arbitrary strings consisting of small Latin letters. Bob is a system administrator in «Bersoft» company. He keeps a list of email addresses of the company's staff. This list is as a large string, where all addresses are written in arbitrary order, separated by commas. The same address can be written more than once. Suddenly, because of unknown reasons, all commas in Bob's list disappeared. Now Bob has a string, where all addresses are written one after another without any separators, and there is impossible to determine, where the boundaries between addresses are. Unfortunately, on the same day his chief asked him to bring the initial list of addresses. Now Bob wants to disjoin addresses in some valid way. Help him to do that. Input The first line contains the list of addresses without separators. The length of this string is between 1 and 200, inclusive. The string consists only from small Latin letters and characters «@». Output If there is no list of the valid (according to the Berland rules) email addresses such that after removing all commas it coincides with the given string, output No solution. In the other case, output the list. The same address can be written in this list more than once. If there are several solutions, output any of them. Examples Input a@aa@a Output a@a,a@a Input a@a@a Output No solution Input @aa@a Output No solution Tags: greedy, implementation, strings Correct Solution: ``` s=input() n=len(s) ans=[] x='' c=0 for i in range(n): if i!=n-1: if s[i+1]!='@': x=x+s[i] else: if c==0: x=x+s[i] c=1 else: ans.append(x) x='' x=x+s[i] c=1 else: x=x+s[i] ans.append(x) f=0 for i in range(len(ans)): if ans[i][0]=='@' or ans[i][-1]=='@' or '@' not in ans[i]: f=1 break if f: print('No solution') else: for i in range(len(ans)-1): print(ans[i]+',',end='') print(ans[-1]) ```
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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. Email address in Berland is a string of the form A@B, where A and B are arbitrary strings consisting of small Latin letters. Bob is a system administrator in «Bersoft» company. He keeps a list of email addresses of the company's staff. This list is as a large string, where all addresses are written in arbitrary order, separated by commas. The same address can be written more than once. Suddenly, because of unknown reasons, all commas in Bob's list disappeared. Now Bob has a string, where all addresses are written one after another without any separators, and there is impossible to determine, where the boundaries between addresses are. Unfortunately, on the same day his chief asked him to bring the initial list of addresses. Now Bob wants to disjoin addresses in some valid way. Help him to do that. Input The first line contains the list of addresses without separators. The length of this string is between 1 and 200, inclusive. The string consists only from small Latin letters and characters «@». Output If there is no list of the valid (according to the Berland rules) email addresses such that after removing all commas it coincides with the given string, output No solution. In the other case, output the list. The same address can be written in this list more than once. If there are several solutions, output any of them. Examples Input a@aa@a Output a@a,a@a Input a@a@a Output No solution Input @aa@a Output No solution Submitted Solution: ``` import sys def input(): return sys.stdin.readline().strip() def iinput(): return int(input()) def rinput(): return map(int, sys.stdin.readline().strip().split()) def get_list(): return list(map(int, sys.stdin.readline().strip().split())) mod = int(1e9)+7 s = input() l = len(s) ans = [] prev = -1 flag = True tot = s.count("@") cnt = 0 if (s[0]=="@" or s[l-1]=="@" or tot==0): print("No solution") sys.exit(0) for i in range(l): if s[i]=="@": bef = s[prev+1:i] aft = s[i+1:] if "@" in aft: aft = aft[:aft.index("@")] if (len(ans)>0 and len(bef)<1) or len(aft)==0: flag = False break if cnt!=tot-1: ans.append(bef+"@"+aft[0]) else: ans.append(bef+"@"+aft) prev = i+1 cnt+=1 # print(bef, aft) if flag == False: print("No solution") else: print(*ans, sep=",") ``` Yes
24,144
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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. Email address in Berland is a string of the form A@B, where A and B are arbitrary strings consisting of small Latin letters. Bob is a system administrator in «Bersoft» company. He keeps a list of email addresses of the company's staff. This list is as a large string, where all addresses are written in arbitrary order, separated by commas. The same address can be written more than once. Suddenly, because of unknown reasons, all commas in Bob's list disappeared. Now Bob has a string, where all addresses are written one after another without any separators, and there is impossible to determine, where the boundaries between addresses are. Unfortunately, on the same day his chief asked him to bring the initial list of addresses. Now Bob wants to disjoin addresses in some valid way. Help him to do that. Input The first line contains the list of addresses without separators. The length of this string is between 1 and 200, inclusive. The string consists only from small Latin letters and characters «@». Output If there is no list of the valid (according to the Berland rules) email addresses such that after removing all commas it coincides with the given string, output No solution. In the other case, output the list. The same address can be written in this list more than once. If there are several solutions, output any of them. Examples Input a@aa@a Output a@a,a@a Input a@a@a Output No solution Input @aa@a Output No solution Submitted Solution: ``` def solution(): s = input() if '@' not in s: return "No solution" mas = s.split('@') if len(mas[0]) < 1 or len(mas[-1]) < 1: return "No solution" front = mas[0] back = mas[-1] mas = mas[1:len(mas) - 1] for i in range(len(mas)): if len(mas[i]) < 2: return "No solution" else: mas[i] = mas[i][:len(mas[i]) // 2] + ',' + mas[i][len(mas[i]) // 2:] return '@'.join([front] + mas + [back]) print(solution()) ``` Yes
24,145
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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. Email address in Berland is a string of the form A@B, where A and B are arbitrary strings consisting of small Latin letters. Bob is a system administrator in «Bersoft» company. He keeps a list of email addresses of the company's staff. This list is as a large string, where all addresses are written in arbitrary order, separated by commas. The same address can be written more than once. Suddenly, because of unknown reasons, all commas in Bob's list disappeared. Now Bob has a string, where all addresses are written one after another without any separators, and there is impossible to determine, where the boundaries between addresses are. Unfortunately, on the same day his chief asked him to bring the initial list of addresses. Now Bob wants to disjoin addresses in some valid way. Help him to do that. Input The first line contains the list of addresses without separators. The length of this string is between 1 and 200, inclusive. The string consists only from small Latin letters and characters «@». Output If there is no list of the valid (according to the Berland rules) email addresses such that after removing all commas it coincides with the given string, output No solution. In the other case, output the list. The same address can be written in this list more than once. If there are several solutions, output any of them. Examples Input a@aa@a Output a@a,a@a Input a@a@a Output No solution Input @aa@a Output No solution Submitted Solution: ``` s = input().split('@') if len(s) > 1 and s[0] and s[-1] and min(map(len, s[1:-1] + ['__'])) > 1: for i in range(1, len(s) - 1): s[i] = s[i][0] + ',' + s[i][1:] print('@'.join(s)) else: print('No solution') ``` Yes
24,146
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Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response. Email address in Berland is a string of the form A@B, where A and B are arbitrary strings consisting of small Latin letters. Bob is a system administrator in «Bersoft» company. He keeps a list of email addresses of the company's staff. This list is as a large string, where all addresses are written in arbitrary order, separated by commas. The same address can be written more than once. Suddenly, because of unknown reasons, all commas in Bob's list disappeared. Now Bob has a string, where all addresses are written one after another without any separators, and there is impossible to determine, where the boundaries between addresses are. Unfortunately, on the same day his chief asked him to bring the initial list of addresses. Now Bob wants to disjoin addresses in some valid way. Help him to do that. Input The first line contains the list of addresses without separators. The length of this string is between 1 and 200, inclusive. The string consists only from small Latin letters and characters «@». Output If there is no list of the valid (according to the Berland rules) email addresses such that after removing all commas it coincides with the given string, output No solution. In the other case, output the list. The same address can be written in this list more than once. If there are several solutions, output any of them. Examples Input a@aa@a Output a@a,a@a Input a@a@a Output No solution Input @aa@a Output No solution Submitted Solution: ``` a=input().split("@") ans=a[0] if len(a[0])==0 or len(a)<=1 or len(a[-1])==0: print("No solution") exit() for u in range(1,len(a)-1): if len(a[u])>1: ans+="@"+a[u][0]+","+a[u][1:] else: print("No solution") exit() print(ans+"@"+a[-1]) ``` Yes
24,147
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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. Email address in Berland is a string of the form A@B, where A and B are arbitrary strings consisting of small Latin letters. Bob is a system administrator in «Bersoft» company. He keeps a list of email addresses of the company's staff. This list is as a large string, where all addresses are written in arbitrary order, separated by commas. The same address can be written more than once. Suddenly, because of unknown reasons, all commas in Bob's list disappeared. Now Bob has a string, where all addresses are written one after another without any separators, and there is impossible to determine, where the boundaries between addresses are. Unfortunately, on the same day his chief asked him to bring the initial list of addresses. Now Bob wants to disjoin addresses in some valid way. Help him to do that. Input The first line contains the list of addresses without separators. The length of this string is between 1 and 200, inclusive. The string consists only from small Latin letters and characters «@». Output If there is no list of the valid (according to the Berland rules) email addresses such that after removing all commas it coincides with the given string, output No solution. In the other case, output the list. The same address can be written in this list more than once. If there are several solutions, output any of them. Examples Input a@aa@a Output a@a,a@a Input a@a@a Output No solution Input @aa@a Output No solution Submitted Solution: ``` s = input() prev = 0 lis = [] start = 0 flag = 0 for i in range(len(s)): if s[i] == '@' and prev == 0: if i-prev<=0: flag = 1 break prev= i elif s[i] == '@': lis.append(s[start:prev+2]) start = prev+2 prev = i if flag: print("No solution") else: if '@' in s[start:] and s[len(s)-1]!='@': lis.append(s[start:]) for i in range(len(lis)-1): print(lis[i], end = ",") print(lis[len(lis)-1]) else: print("No solution") ``` No
24,148
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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. Email address in Berland is a string of the form A@B, where A and B are arbitrary strings consisting of small Latin letters. Bob is a system administrator in «Bersoft» company. He keeps a list of email addresses of the company's staff. This list is as a large string, where all addresses are written in arbitrary order, separated by commas. The same address can be written more than once. Suddenly, because of unknown reasons, all commas in Bob's list disappeared. Now Bob has a string, where all addresses are written one after another without any separators, and there is impossible to determine, where the boundaries between addresses are. Unfortunately, on the same day his chief asked him to bring the initial list of addresses. Now Bob wants to disjoin addresses in some valid way. Help him to do that. Input The first line contains the list of addresses without separators. The length of this string is between 1 and 200, inclusive. The string consists only from small Latin letters and characters «@». Output If there is no list of the valid (according to the Berland rules) email addresses such that after removing all commas it coincides with the given string, output No solution. In the other case, output the list. The same address can be written in this list more than once. If there are several solutions, output any of them. Examples Input a@aa@a Output a@a,a@a Input a@a@a Output No solution Input @aa@a Output No solution Submitted Solution: ``` string=input() if len(string)==1: print('No solution') exit() lst=string.split('@') middle=lst[1:-1] if not( lst[0].isalpha() and lst[-1].isalpha()): print('No solution') exit() if len(lst)==2: print(string) exit() if not all(list(map(lambda x:len(x)>1 and x.isalpha(),middle))): print('No solution') exit() first=lst[0] emails=[] for i in middle: last=i[0] emails.append(first+'@'+last) first=i[1:] emails.append(first+'@'+lst[-1]) print(','.join(emails)) ``` No
24,149
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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. Email address in Berland is a string of the form A@B, where A and B are arbitrary strings consisting of small Latin letters. Bob is a system administrator in «Bersoft» company. He keeps a list of email addresses of the company's staff. This list is as a large string, where all addresses are written in arbitrary order, separated by commas. The same address can be written more than once. Suddenly, because of unknown reasons, all commas in Bob's list disappeared. Now Bob has a string, where all addresses are written one after another without any separators, and there is impossible to determine, where the boundaries between addresses are. Unfortunately, on the same day his chief asked him to bring the initial list of addresses. Now Bob wants to disjoin addresses in some valid way. Help him to do that. Input The first line contains the list of addresses without separators. The length of this string is between 1 and 200, inclusive. The string consists only from small Latin letters and characters «@». Output If there is no list of the valid (according to the Berland rules) email addresses such that after removing all commas it coincides with the given string, output No solution. In the other case, output the list. The same address can be written in this list more than once. If there are several solutions, output any of them. Examples Input a@aa@a Output a@a,a@a Input a@a@a Output No solution Input @aa@a Output No solution Submitted Solution: ``` def main(): string = input() comps = string.split('@') ans = [] for i in range(len(comps)): if i == 0 or i == len(comps) - 1: if len(comps[i]) < 1: print("No solution") return else: if len(comps[i]) < 2: print("No solution") return for i in range(len(comps) - 1): if i == 0: ans.append(comps[i] + '@' + comps[i + 1][:1]) elif i == len(comps) - 2: ans.append(comps[i][1:] + '@' + comps[i + 1]) else: ans.append(comps[i][1:] + '@' + comps[i + 1][:1]) print(', '.join(ans)) main() ``` No
24,150
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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. Email address in Berland is a string of the form A@B, where A and B are arbitrary strings consisting of small Latin letters. Bob is a system administrator in «Bersoft» company. He keeps a list of email addresses of the company's staff. This list is as a large string, where all addresses are written in arbitrary order, separated by commas. The same address can be written more than once. Suddenly, because of unknown reasons, all commas in Bob's list disappeared. Now Bob has a string, where all addresses are written one after another without any separators, and there is impossible to determine, where the boundaries between addresses are. Unfortunately, on the same day his chief asked him to bring the initial list of addresses. Now Bob wants to disjoin addresses in some valid way. Help him to do that. Input The first line contains the list of addresses without separators. The length of this string is between 1 and 200, inclusive. The string consists only from small Latin letters and characters «@». Output If there is no list of the valid (according to the Berland rules) email addresses such that after removing all commas it coincides with the given string, output No solution. In the other case, output the list. The same address can be written in this list more than once. If there are several solutions, output any of them. Examples Input a@aa@a Output a@a,a@a Input a@a@a Output No solution Input @aa@a Output No solution Submitted Solution: ``` s=input() if s[0]!="@" and s[len(s)-1]!="@": exit=s[::-1] exit=len(exit)-exit.index("@")-1 mas=[] res="" t=True for i in range(len(s)): res=res+s[i] if (s[i]=="@"): if i!=exit: t=False if (s[i+1]=="@"): break continue else: t=True if t==False: t=True mas.append(res) res="" if i+1==len(s): mas.append(res) if t==True: print(",".join(mas)) else: print("No solution") else: print("No solution") ``` No
24,151
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Haiku is a genre of Japanese traditional poetry. A haiku poem consists of 17 syllables split into three phrases, containing 5, 7 and 5 syllables correspondingly (the first phrase should contain exactly 5 syllables, the second phrase should contain exactly 7 syllables, and the third phrase should contain exactly 5 syllables). A haiku masterpiece contains a description of a moment in those three phrases. Every word is important in a small poem, which is why haiku are rich with symbols. Each word has a special meaning, a special role. The main principle of haiku is to say much using a few words. To simplify the matter, in the given problem we will consider that the number of syllable in the phrase is equal to the number of vowel letters there. Only the following letters are regarded as vowel letters: "a", "e", "i", "o" and "u". Three phases from a certain poem are given. Determine whether it is haiku or not. Input The input data consists of three lines. The length of each line is between 1 and 100, inclusive. The i-th line contains the i-th phrase of the poem. Each phrase consists of one or more words, which are separated by one or more spaces. A word is a non-empty sequence of lowercase Latin letters. Leading and/or trailing spaces in phrases are allowed. Every phrase has at least one non-space character. See the example for clarification. Output Print "YES" (without the quotes) if the poem is a haiku. Otherwise, print "NO" (also without the quotes). Examples Input on codeforces beta round is running a rustling of keys Output YES Input how many gallons of edo s rain did you drink cuckoo Output NO Tags: implementation, strings Correct Solution: ``` print('YES' if [sum(s.count(x) for x in "aeiou") for s in [input() for _ in range(3)]]==[5,7,5] else 'NO') ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Haiku is a genre of Japanese traditional poetry. A haiku poem consists of 17 syllables split into three phrases, containing 5, 7 and 5 syllables correspondingly (the first phrase should contain exactly 5 syllables, the second phrase should contain exactly 7 syllables, and the third phrase should contain exactly 5 syllables). A haiku masterpiece contains a description of a moment in those three phrases. Every word is important in a small poem, which is why haiku are rich with symbols. Each word has a special meaning, a special role. The main principle of haiku is to say much using a few words. To simplify the matter, in the given problem we will consider that the number of syllable in the phrase is equal to the number of vowel letters there. Only the following letters are regarded as vowel letters: "a", "e", "i", "o" and "u". Three phases from a certain poem are given. Determine whether it is haiku or not. Input The input data consists of three lines. The length of each line is between 1 and 100, inclusive. The i-th line contains the i-th phrase of the poem. Each phrase consists of one or more words, which are separated by one or more spaces. A word is a non-empty sequence of lowercase Latin letters. Leading and/or trailing spaces in phrases are allowed. Every phrase has at least one non-space character. See the example for clarification. Output Print "YES" (without the quotes) if the poem is a haiku. Otherwise, print "NO" (also without the quotes). Examples Input on codeforces beta round is running a rustling of keys Output YES Input how many gallons of edo s rain did you drink cuckoo Output NO Tags: implementation, strings Correct Solution: ``` import sys import os from collections import Counter def changeStdioToFile(): path = os.path.dirname(os.path.abspath(__file__)) sys.stdin = open(f'{path}/input.txt', 'r') sys.stdout = open(f'{path}/output.txt', 'w') #changeStdioToFile() t = 1 # t = int(input()) for _ in range(t): flag = False for i in (5, 7, 5): c = Counter(input()) if sum(c.get(w, 0) for w in 'aeiou') != i: flag = True print("YES" if not flag else "NO") ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Haiku is a genre of Japanese traditional poetry. A haiku poem consists of 17 syllables split into three phrases, containing 5, 7 and 5 syllables correspondingly (the first phrase should contain exactly 5 syllables, the second phrase should contain exactly 7 syllables, and the third phrase should contain exactly 5 syllables). A haiku masterpiece contains a description of a moment in those three phrases. Every word is important in a small poem, which is why haiku are rich with symbols. Each word has a special meaning, a special role. The main principle of haiku is to say much using a few words. To simplify the matter, in the given problem we will consider that the number of syllable in the phrase is equal to the number of vowel letters there. Only the following letters are regarded as vowel letters: "a", "e", "i", "o" and "u". Three phases from a certain poem are given. Determine whether it is haiku or not. Input The input data consists of three lines. The length of each line is between 1 and 100, inclusive. The i-th line contains the i-th phrase of the poem. Each phrase consists of one or more words, which are separated by one or more spaces. A word is a non-empty sequence of lowercase Latin letters. Leading and/or trailing spaces in phrases are allowed. Every phrase has at least one non-space character. See the example for clarification. Output Print "YES" (without the quotes) if the poem is a haiku. Otherwise, print "NO" (also without the quotes). Examples Input on codeforces beta round is running a rustling of keys Output YES Input how many gallons of edo s rain did you drink cuckoo Output NO Tags: implementation, strings Correct Solution: ``` s1=input() s2=input() s3=input() c1=s1.count('a')+s1.count('e')+s1.count('i')+s1.count('o')+s1.count('u') c2=s2.count('a')+s2.count('e')+s2.count('i')+s2.count('o')+s2.count('u') c3=s3.count('a')+s3.count('e')+s3.count('i')+s3.count('o')+s3.count('u') if(c1==5 and c2==7 and c3==5): print("YES") else: print("NO") ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Haiku is a genre of Japanese traditional poetry. A haiku poem consists of 17 syllables split into three phrases, containing 5, 7 and 5 syllables correspondingly (the first phrase should contain exactly 5 syllables, the second phrase should contain exactly 7 syllables, and the third phrase should contain exactly 5 syllables). A haiku masterpiece contains a description of a moment in those three phrases. Every word is important in a small poem, which is why haiku are rich with symbols. Each word has a special meaning, a special role. The main principle of haiku is to say much using a few words. To simplify the matter, in the given problem we will consider that the number of syllable in the phrase is equal to the number of vowel letters there. Only the following letters are regarded as vowel letters: "a", "e", "i", "o" and "u". Three phases from a certain poem are given. Determine whether it is haiku or not. Input The input data consists of three lines. The length of each line is between 1 and 100, inclusive. The i-th line contains the i-th phrase of the poem. Each phrase consists of one or more words, which are separated by one or more spaces. A word is a non-empty sequence of lowercase Latin letters. Leading and/or trailing spaces in phrases are allowed. Every phrase has at least one non-space character. See the example for clarification. Output Print "YES" (without the quotes) if the poem is a haiku. Otherwise, print "NO" (also without the quotes). Examples Input on codeforces beta round is running a rustling of keys Output YES Input how many gallons of edo s rain did you drink cuckoo Output NO Tags: implementation, strings Correct Solution: ``` a=input().replace(' ','') b=input().replace(' ','') c=input().replace(' ','') l=list('aeiou') f,d,e=0,0,0 for i in a: if i in l: f+=1 for i in b: if i in l: d+=1 for i in c: if i in l: e+=1 if(f==5 and d==7 and e==5): print("YES") else: print("NO") ```
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6
Provide tags and a correct Python 3 solution for this coding contest problem. Haiku is a genre of Japanese traditional poetry. A haiku poem consists of 17 syllables split into three phrases, containing 5, 7 and 5 syllables correspondingly (the first phrase should contain exactly 5 syllables, the second phrase should contain exactly 7 syllables, and the third phrase should contain exactly 5 syllables). A haiku masterpiece contains a description of a moment in those three phrases. Every word is important in a small poem, which is why haiku are rich with symbols. Each word has a special meaning, a special role. The main principle of haiku is to say much using a few words. To simplify the matter, in the given problem we will consider that the number of syllable in the phrase is equal to the number of vowel letters there. Only the following letters are regarded as vowel letters: "a", "e", "i", "o" and "u". Three phases from a certain poem are given. Determine whether it is haiku or not. Input The input data consists of three lines. The length of each line is between 1 and 100, inclusive. The i-th line contains the i-th phrase of the poem. Each phrase consists of one or more words, which are separated by one or more spaces. A word is a non-empty sequence of lowercase Latin letters. Leading and/or trailing spaces in phrases are allowed. Every phrase has at least one non-space character. See the example for clarification. Output Print "YES" (without the quotes) if the poem is a haiku. Otherwise, print "NO" (also without the quotes). Examples Input on codeforces beta round is running a rustling of keys Output YES Input how many gallons of edo s rain did you drink cuckoo Output NO Tags: implementation, strings Correct Solution: ``` # import sys # sys.stdin=open('input.in','r') # sys.stdout=open('output.out','w') l=['a','e','i','o','u'] t1=t2=t3=0 s1=input().strip() s2=input().strip() s3=input().strip() for x in s1: if x in l: t1+=1 for x in s2: if x in l: t2+=1 for x in s3: if x in l: t3+=1 if t1==5 and t2==7 and t3==5: print('YES') else: print('NO') ```
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