Harryxun/testdata huggingface dataset:
Buggy python submission (verdict: Runtime Error):
s = input()
r = input()
for i in range (len(s)+len(t)):
    if i % 2 == 0: 
        print(s[i//2],end="")
    else:
        print(t[i//2],end="")

Fixed submission:
s = input()
t = input()
for i in range (len(s)+len(t)):
    if i % 2 == 0: 
        print(s[i//2],end="")
    else:
        print(t[i//2],end="")
Buggy python submission (verdict: Runtime Error):
A, B = int(input().split())
if A + B > 24:
  print(A + B -24)
else:
  print(A + B)

Fixed submission:
A, B = map(int,input().split())
if A + B >= 24:
  print(A + B -24)
else:
  print(A + B)
Buggy python submission (verdict: Runtime Error):
a , b = input().split()
if a == b:
  print("H"):
else:
  print("D")

Fixed submission:
a , b = input().split()
if a == b:
  print("H")
else:
  print("D")
Buggy python submission (verdict: Time Limit Exceeded):
n = int(input())
power = 1
for i in range(1,n+1):
    power *= i
print(power % (10**9 + 7))

Fixed submission:
import math
n = int(input())
power = 1
print(math.factorial(n) % (10**9 + 7))
Buggy python submission (verdict: Time Limit Exceeded):
k,s = map(int,input().split())
ans = 0
for x in range(k+1):
    for y in range(k+1):
      for z in range(k+1):
          if s == x + y + z:
              ans += 1
print(ans)

Fixed submission:
k,s = map(int,input().split())
ans = 0
for x in range(k+1):
    for y in range(k+1):
        z = s - x - y
        if 0 <= z and z <= k:
            ans += 1
print(ans)
Buggy python submission (verdict: Runtime Error):
n,l = map(int,input().split())
s = []
for i in range(l):
    s.append(input())
s.sort()
print(*s,sep="")

Fixed submission:
n,l = map(int,input().split())
s = []
for i in range(n):
    s.append(input())
s.sort()
print(*s,sep="")
Buggy python submission (verdict: Runtime Error):
a = input()
b = input()

if a * b % 2 == 0:
  print('Even')
else:
  print('Odd')

Fixed submission:
a, b = map(int, input().split())

if (a * b) % 2 == 0:
  print("Even")
else:
  print("Odd")
Buggy python submission (verdict: Runtime Error):
a, b, c = map(int, input().split(None, 2))

print(a+b+c)


Fixed submission:
print(input().count("1"))

Buggy python submission (verdict: Runtime Error):
a, b, c = map(int, input().split(None, 2)

print(a+b+c)

Fixed submission:
print(input().count("1"))

Buggy python submission (verdict: Runtime Error):
a, b, c = map(int, input().split())

print(a+b+c)

Fixed submission:
print(input().count("1"))
Buggy python submission (verdict: Runtime Error):
N = int(input())

A = int(input().split())

b = sum(reverse(a)) for a in A

print(sum(severse(b)))

Fixed submission:
N = int(input())
 
A = map(int,input().split())

A = [1/a for a in A]

print(1/sum(A))
Buggy python submission (verdict: Runtime Error):
import numpy as np
firstline=input().split()
K=int(firstline[0])
X=int(firstline[1])
blackstone=np.arange(X-K+1,X+K)
array_info(blackstone)

Fixed submission:
line = input().split()
K = int(line[0])
X = int(line[1])

ans = list(range(X-K+1,X+K))
print(' '.join(map(str,ans)))
Buggy python submission (verdict: Runtime Error):
if __name__ == "__main__":
  inputstr = input()
  size = len(inputstr)

  isEasy = True

  for i in range(size):
    if i % 2 == 0:
      if inputstr[i] in ["R", "U", "D"]:
      else:
        isEasy = False
        break
    else:
      if inputstr[i] in ["L", "U", "D"]:
      else:
        isEasy = False
        break

  if isEasy = True:
    print("Yes")
  else:
    print("No")


Fixed submission:
if __name__ == "__main__":
  inputstr = input()
  size = len(inputstr)
  isEasy = True

  for i in range(size):
    point = i + 1
    if point % 2 == 0:
      if inputstr[i] in ["L", "U", "D"]:
        pass
      else:
        isEasy = False
        break
    else:
      if inputstr[i] in ["R", "U", "D"]:
        pass
      else:
        isEasy = False
        break

  if isEasy == True:
    print("Yes")
  else:
    print("No")
Buggy python submission (verdict: Runtime Error):
n = int(input())
a = list(map(int, input().split()))

li = []
cnt = 0
c = a[0]

for i in range(1,n):
	# print(c)
	if c >= a[i]:
		cnt += 1
		c = a[i]
	else:
		li.append(cnt)
		c = a[i]
		cnt = 0
	
	if i == n-1:
		li.append(cnt)

print(max(li))

Fixed submission:
n = int(input())
a = list(map(int, input().split()))

li = []
cnt = 0
c = a[0]
if n >= 2:
	for i in range(1,n):
		# print(c)
		if c >= a[i]:
			cnt += 1
			c = a[i]
		else:
			li.append(cnt)
			c = a[i]
			cnt = 0
		
		if i == n-1:
			li.append(cnt)
else:
	li.append(0)



print(max(li))
Buggy python submission (verdict: Time Limit Exceeded):
n = int(input()) 
t = [int(input()) for i in range(n)]
m = max(t)
for i in range(n):
	x = t.copy()
	if t[i] != m:
		print(m)
	else:
		x.pop(i)
		print(max(x))

Fixed submission:
n = int(input()) 
t = [int(input()) for i in range(n)]
m2 = sorted(t)[-2]
m = max(t)
for i in range(n):
	if t[i] != m:
		print(m)
	else:
		print(m2)

Buggy python submission (verdict: Time Limit Exceeded):
n = int(input()) 
t = [int(input()) for i in range(n)]
for i in range(n):
	x = t.copy()
	x.pop(i)
	print(max(x))

Fixed submission:
n = int(input()) 
t = [int(input()) for i in range(n)]
m2 = sorted(t)[-2]
m = max(t)
for i in range(n):
	if t[i] != m:
		print(m)
	else:
		print(m2)
Buggy python submission (verdict: Runtime Error):
x ,a =  map(int, input().split())
if x < a:
	print(0)
elif:
	print(10)

Fixed submission:
x ,a =  map(int, input().split())
if x < a:
	print(0)
else:
	print(10)
Buggy python submission (verdict: Runtime Error):
a = input()
x = [a[i:i+1] for i in range(len(a))]
r = len([s for s in l if s.endswith('x')])
if r >= 8:
	print('NO')
else:
	print('YES')

Fixed submission:
a = input()
x = [a[i:i+1] for i in range(len(a))]
r = len([s for s in x if s.endswith('x')])
if r >= 8:
	print('NO')
else:
	print('YES')
Buggy python submission (verdict: Runtime Error):
A, B = map(int, input().split())
X = 0
if A >= 13:
	X = B
elif A < 13 AND A >= 6:
	X = B/2

print(X)

Fixed submission:
A, B = map(int, input().split())
X = 0
if A > 12:
	X = B
elif A > 5:
	X = int(B/2)
elif A < 6:
	X = 0

print(X)
Buggy python submission (verdict: Time Limit Exceeded):
import copy
n = int(input())
l = sorted(list(map(int, input().split())))
b = []

def gcd(a,b):
	while b:
		a, b = b, a % b
	return a
if n == 2:
	print(max(l[0],l[1]))
elif n == 3:
	print(max(gcd(l[0],l[1]),gcd(l[0],l[2]),gcd(l[2],l[1])))
else:
	for i in range(n):
		tmp = copy.copy(l)
		tmp.pop(i)
		x = gcd(tmp[0],tmp[1])
		for j in list(range(2, n-1)):
			x = gcd(x,tmp[j])
		b.append(x)
	print(max(b))

Fixed submission:
def gcd(a,b):
  while b:a,b=b,a%b
  return a
n,a,b=int(input()),list(map(int,input().split())),[]
if n==2:print(max(a[0],a[1]))
elif n==3:print(max(gcd(a[0],a[1]),gcd(a[0],a[2]),gcd(a[1],a[2])))
else:
  no,mi=a[0],a[0]
  for i in range(1,n):
    s=gcd(no,a[i])
    if s!=no:
      no=max(s,mi)
      mi=gcd(s,mi)
  print(no)

Buggy python submission (verdict: Time Limit Exceeded):
import copy
n = int(input())
l = list(map(int, input().split()))
b = []

def gcd(a,b):
	while b:
		a, b = b, a % b
	return a
if n == 2:
	print(max(l[0],l[1]))
elif n == 3:
	print(max(gcd(l[0],l[1]),gcd(l[0],l[2]),gcd(l[2],l[1])))
else:
	for i in range(n):
		tmp = copy.copy(l)
		tmp.pop(i)
		x = gcd(tmp[0],tmp[1])
		for j in list(range(2, n-1)):
			x = gcd(x,tmp[j])
		b.append(x)
	print(max(b))

Fixed submission:
def gcd(a,b):
  while b:a,b=b,a%b
  return a
n,a,b=int(input()),list(map(int,input().split())),[]
if n==2:print(max(a[0],a[1]))
elif n==3:print(max(gcd(a[0],a[1]),gcd(a[0],a[2]),gcd(a[1],a[2])))
else:
  no,mi=a[0],a[0]
  for i in range(1,n):
    s=gcd(no,a[i])
    if s!=no:
      no=max(s,mi)
      mi=gcd(s,mi)
  print(no)

Buggy python submission (verdict: Runtime Error):
n = int(input())
l = list(map(int, input().split()))
b = []

def gcd(a,b):
	while b:
		a, b = b, a % b
	return a
if n == 2:
	print(max(l[0],l[1]))
elif n == 3:
	print(max(gcd(l[0],l[1]),gcd(l[0],l[2]),gcd(l[2],l[1])))
else:
	for i in range(n):
		tmp = l
		tmp.pop(i)
		x = gcd(tmp[0],tmp[1])
		for j in list(range(2, n-1)):
			x = gcd(x,tmp[j])
		b.append(x)
	print(max(b))

Fixed submission:
def gcd(a,b):
  while b:a,b=b,a%b
  return a
n,a,b=int(input()),list(map(int,input().split())),[]
if n==2:print(max(a[0],a[1]))
elif n==3:print(max(gcd(a[0],a[1]),gcd(a[0],a[2]),gcd(a[1],a[2])))
else:
  no,mi=a[0],a[0]
  for i in range(1,n):
    s=gcd(no,a[i])
    if s!=no:
      no=max(s,mi)
      mi=gcd(s,mi)
  print(no)

Buggy python submission (verdict: Runtime Error):
n = int(input())
l = list(map(int, input().split()))
b = []

def gcd(a,b):
	while b:
		a, b = b, a % b
	return a
if n == 1:
	print(l[0])
elif n == 2:
	print(gcd(l[0],l[1]))
elif n == 3:
	print(max(gcd(l[0],l[1]),gcd(l[0],l[2]),gcd(l[2],l[1])))
else:
	for i in range(n):
		tmp = l
		tmp.pop(i)
		x = gcd(tmp[0],tmp[1])
		for j in list(range(2, n-1)):
			x = gcd(x,tmp[j])
		b.append(x)
	print(max(b))

Fixed submission:
def gcd(a,b):
  while b:a,b=b,a%b
  return a
n,a,b=int(input()),list(map(int,input().split())),[]
if n==2:print(max(a[0],a[1]))
elif n==3:print(max(gcd(a[0],a[1]),gcd(a[0],a[2]),gcd(a[1],a[2])))
else:
  no,mi=a[0],a[0]
  for i in range(1,n):
    s=gcd(no,a[i])
    if s!=no:
      no=max(s,mi)
      mi=gcd(s,mi)
  print(no)
Buggy python submission (verdict: Runtime Error):
s = int(input())
List=list(map(int,input().split()))
a = 1
b=List[0]
for i in range(s):
    if b <= List[i+1]:
        a +=1
        b = List[i+1]
print(a)

Fixed submission:
s = int(input())
List=list(map(int,input().split()))
a = 0
b=List[0]
for i in range(s):
    if b <= List[i]:
        a +=1
        b = List[i]

print(a)
Buggy python submission (verdict: Time Limit Exceeded):
n = int(input())
str_list = list()
for _ in range(n):
  tar_str = input()
  str_list.append(sorted(list(tar_str)))

count = 0
for j in range(len(str_list)):
  t_list = str_list.pop()
  for k in str_list:
    if t_list == k:
      count += 1
print(count)

Fixed submission:
import collections
n = int(input())
s = ["".join(sorted(input())) for _ in range(n)]
c = collections.Counter(s)
ans = 0
for si in set(s):
  a = c[si]
  ans += a * (a - 1) // 2
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
n = int(input())
str_list = list()
for _ in range(n):
  tar_str = input()
  tmp_list = list()
  for i in tar_str:
    tmp_list.append(i)
  str_list.append(sorted(tmp_list))

count = 0
for j in range(len(str_list)):
  t_list = str_list.pop()
  for k in str_list:
    if t_list == k:
      count += 1
print(count)

Fixed submission:
import collections
n = int(input())
s = ["".join(sorted(input())) for _ in range(n)]
c = collections.Counter(s)
ans = 0
for si in set(s):
  a = c[si]
  ans += a * (a - 1) // 2
print(ans)
Buggy python submission (verdict: Time Limit Exceeded):
import copy
n = int(input())
a_list = [ int(input()) for _ in range(n)]
for i, a in enumerate(a_list):
  tmp_list = copy.copy(a_list)
  tmp_list.pop(i)
  max_val = max(tmp_list)
  print(max_val)
  

Fixed submission:
import copy
n = int(input())
a_list = [ int(input()) for _ in range(n)]
max_val = max(a_list)
index = [a_list.index(max_val)]
tmp_list = copy.copy(a_list)
for i, a in enumerate(a_list):
  if 2 <= len(index):
    print(max_val)
  elif i in index:
    tmp_list.pop(i)
    print(max(tmp_list))
    tmp_list = copy.copy(a_list)
  else:
    print(max_val)
Buggy python submission (verdict: Runtime Error):
W, H, x, y = map(int, input().split())
ans = 0
me_x = 0
me_y = 0
total = W * H
# (W - x) * H
if (W - x) > x:
  me_x = x * H
else:
  me_x = (W - x) * H

if (H - y) > y:
  me_y = y * W
else:
  me_y = (H - y) * W

if me_x > me_y:
  me_ans = me_x
else:
  me_ans = me_y

if me_x == (total - me_y):
  ans = 1
elif me_y == (total - me_x):
  ans = 1

if me_x == me_y:
  ans = 1
print(me_ans, ans)

Fixed submission:
X, A = map(int, input().split())
if X < A:
  print(0)
else:
  print(10)
Buggy python submission (verdict: Runtime Error):
S=input()

def func1(lst, value):
    return [i for i, x in enumerate(lst) if x == value]
  
idx=func1(a,S)[0]

if idx==2:
  ans=0
else:
  ans=idx+1

print(a[ans])

Fixed submission:
a=["Sunny", "Cloudy", "Rainy"]

S=input()

def func1(lst, value):
    return [i for i, x in enumerate(lst) if x == value]
  
idx=func1(a,S)[0]

if idx==2:
  ans=0
else:
  ans=idx+1

print(a[ans])
Buggy python submission (verdict: Runtime Error):
N = int(input())
H= [int(s) for s in input().split()]

#print(N,H)

t=0
k=0

for i in range(1,N):
#  print("i="+str(i))
  if H[i]-H[i-1]<=0:
    k=k+1
#    print("k="+str(k))
    if k > t:
      t=k
#      print("t="+str(t))
  else:
    k=0
    continue
    
print(k)


Fixed submission:
S=list(input())
T=list(input())

k=0
for i in (range(3)):
  if S[i]==T[i]:
    k=k+1

print(k)
Buggy python submission (verdict: Runtime Error):
a = int(input())
b= [int(s) for s in input().split()]
b=sorted(b)

t = (b[0] + b[1])/2
for i in range(a-2):
  k = (t + b[i+2])/2
  t=k
  
print(k)


Fixed submission:
a = int(input())
b= [int(s) for s in input().split()]
b=sorted(b)

t = (b[0] + b[1])/2

if a!=2:
	for i in range(a-2):
  		k = (t + b[i+2])/2
  		t=k

print(t)
Buggy python submission (verdict: Runtime Error):
n, k, q = map(int, input().split())
nlist = [0 for i in range(n)]

for i in range(q):
    nlist[int(input())-1] += 1

for n in nlist:
    if q - n < k:
        print('Yes')
    else:
        print('No')


Fixed submission:
today = input()
li = ['Sunny', 'Cloudy', 'Rainy']
index = li.index(today)


def next_index(idx):
    if index == 2:
        return 0
    else:
        return idx + 1


print(li[next_index(index)])
Buggy python submission (verdict: Time Limit Exceeded):
n, k, q = map(int, input().split())
alist = [int(input()) for i in range(q)]
pts = [k for i in range(n)]

for a in alist:
    for j in range(n):
        if not j == (a-1):
        	pts[j] -= 1

for b in range(n):
    if pts[b] < 1:
        print('No')
    else:
        print('Yes')


Fixed submission:
n, k, q = map(int, input().split())
nlist = [0 for i in range(n)]

for i in range(q):
    nlist[int(input())-1] += 1

for n in nlist:
    if q - n < k:
        print('Yes')
    else:
        print('No')
Buggy python submission (verdict: Runtime Error):
from functools import reduce
from operator import add

n, m = map(int, input().split())
alist = list(map(int, input().split()))
alist.sort(reverse=True)

for i in range(m):
    alist[0] //= 2
    if alist[0] < alist[1]:
        alist[0], alist[1] = alist[1], alist[0]

print(reduce(add, alist))


Fixed submission:
import heapq
from functools import reduce

n, m = map(int, input().split())
h = list(map(lambda a: -int(a), input().split()))
heapq.heapify(h)  # input().split()))

for i in range(m):
    mx = -(-heapq.heappop(h) // 2)
    heapq.heappush(h, mx)

print(-reduce(lambda a, b: a+b, h))

Buggy python submission (verdict: Time Limit Exceeded):
from functools import reduce
from operator import add

n, m = map(int, input().split())
alist = list(map(int, input().split()))

for i in range(m):
    idx = alist.index(max(alist))
    alist[idx] //= 2

print(reduce(add, alist))


Fixed submission:
import heapq
from functools import reduce

n, m = map(int, input().split())
h = list(map(lambda a: -int(a), input().split()))
heapq.heapify(h)  # input().split()))

for i in range(m):
    mx = -(-heapq.heappop(h) // 2)
    heapq.heappush(h, mx)

print(-reduce(lambda a, b: a+b, h))

Buggy python submission (verdict: Time Limit Exceeded):
from functools import reduce
from operator import add

n, m = map(int, input().split())
alist = list(map(int, input().split()))

for i in range(m):
    alist.sort(reverse=True)
    alist[0] //= 2

print(reduce(add, alist))


Fixed submission:
import heapq
from functools import reduce

n, m = map(int, input().split())
h = list(map(lambda a: -int(a), input().split()))
heapq.heapify(h)  # input().split()))

for i in range(m):
    mx = -(-heapq.heappop(h) // 2)
    heapq.heappush(h, mx)

print(-reduce(lambda a, b: a+b, h))
Buggy python submission (verdict: Runtime Error):
#!/usr/bin/env python
# -*- coding: utf-8 -*-
 
from sys import stdin
import math
 
# 標準入力をスペースで区切って、intに変換 listに収納
#int_list  = [int(x) for x in stdin.readline().rstrip().split()]
N = int(input())
 
total = int(N*(N-1)/2)
print(total)

Fixed submission:
#!/usr/bin/env python
# -*- coding: utf-8 -*-

from sys import stdin
import math

# 標準入力をスペースで区切って、intに変換 listに収納
S = stdin.readline()
T = stdin.readline()

cnt=0
for i in range(3):
    if S[i] == T[i]:
        cnt+=1


print(cnt)

Buggy python submission (verdict: Runtime Error):
#!/usr/bin/env python
# -*- coding: utf-8 -*-

from sys import stdin
import math

# 標準入力をスペースで区切って、intに変換 listに収納
int_list  = [int(x) for x in stdin.readline().rstrip().split()]

N = int_list[0]


total = int(N*(N-1)/2)
print(total)


Fixed submission:
#!/usr/bin/env python
# -*- coding: utf-8 -*-

from sys import stdin
import math

# 標準入力をスペースで区切って、intに変換 listに収納
S = stdin.readline()
T = stdin.readline()

cnt=0
for i in range(3):
    if S[i] == T[i]:
        cnt+=1


print(cnt)
Buggy python submission (verdict: Time Limit Exceeded):
#!/usr/bin/env python
# -*- coding: utf-8 -*-

from sys import stdin
import math

# 標準入力をスペースで区切って、intに変換 listに収納
int_list  = [int(x) for x in stdin.readline().rstrip().split()]

N = int_list[0]

total = 0
for i in range(N):
    total+=i

print(total)



Fixed submission:
N = int(input())
total=int(N*(N-1)//2)
print(total)
Buggy python submission (verdict: Time Limit Exceeded):
#!/usr/bin/env python
# -*- coding: utf-8 -*-

from sys import stdin
import math
import copy

move_limit = 10 ** 5

rl_list  = stdin.readline()

before_child_list = [1] * (len(rl_list)-1)
now_child_list = [1] * (len(rl_list)-1)


# 多分、一定回数うごくと、あとは奇数回動かしたか偶数回動かしたかになる

for i in range(move_limit):
    for j in range(len(rl_list)-1):
        if rl_list[j] == 'R':
            now_child_list[j+1] += before_child_list[j]
            now_child_list[j] -= before_child_list[j]
# 'L'
        else:
            now_child_list[j-1] += before_child_list[j]
            now_child_list[j] -= before_child_list[j]
    before_child_list = copy.copy(now_child_list)

print(*now_child_list)


Fixed submission:
#!/usr/bin/env python
# -*- coding: utf-8 -*-

from sys import stdin
import math
import copy
# 多分、一定回数うごくと、あとは奇数回動かしたか偶数回動かしたかになる

#for i in range(move_limit):
#    for j in range(length):
#        if rl_list[j] == 'R':
#            now_child_list[j+1] += before_child_list[j]
#            now_child_list[j] -= before_child_list[j]
## 'L'
#        else:
#            now_child_list[j-1] += before_child_list[j]
#            now_child_list[j] -= before_child_list[j]
#    before_child_list = copy.copy(now_child_list)
#
#print(*now_child_list)



rl_list  = stdin.readline().strip()

length = len(rl_list) 

r_child_list = [0] * (length)
l_child_list = [0] * (length)
child_list = [0] * (length)

cnt = 0
for i in range(length):
    if rl_list[i] == 'R':
        cnt +=1
    else :#rl_list == 'L'
        r_child_list[i] += cnt
        cnt = 0
r_child_list[length-1] += cnt
for i in reversed(range(length)):
    if rl_list[i] == 'L':
        cnt += 1
    else :#rl_list == 'R':
        l_child_list[i] += cnt
        cnt = 0
l_child_list[0] += cnt
for i in range(length):
    if r_child_list[i] != 0:
        child_list[i] += math.floor(r_child_list[i] / 2)
        child_list[i-1] += math.ceil(r_child_list[i] / 2)
    if l_child_list[i] != 0:
        child_list[i] += math.floor(l_child_list[i] / 2)
        child_list[i+1] += math.ceil(l_child_list[i] / 2)

print(*child_list)
Buggy python submission (verdict: Time Limit Exceeded):

#!/usr/bin/env python
# -*- coding: utf-8 -*-


from sys import stdin
import math

L,R  = [int(x) for x in stdin.readline().rstrip().split()]

diff = R - L

min_val = 2019

for i in range(L,R+1):
    for j in range(i+1,R+1):
        amari = (i * j) % 2019
        if ( min_val > amari ):
            min_val = amari

print(min_val)


Fixed submission:
#!/usr/bin/env python
# -*- coding: utf-8 -*-


from sys import stdin
import math

L,R  = [int(x) for x in stdin.readline().rstrip().split()]

diff = R - L

min_val = 2019



min_val = 2019

sur_L = L % 2019
sur_R = R % 2019

if diff > 2019:
    print(0)

elif sur_R < sur_L:
    print(0)
else:
    if sur_R < sur_L:
        tmp = sur_R
        sur_R = sur_L
        sur_L = tmp
        

    for i in range(sur_L,sur_R+1):
        for j in range(i+1, sur_R+1):
            amari = ( i * j) % 2019
            if min_val > amari:
                min_val = amari

    print(min_val)
Buggy python submission (verdict: Time Limit Exceeded):
#!/usr/bin/env python
# -*- coding: utf-8 -*-

from sys import stdin

N, M = [int(x) for x in stdin.readline().rstrip().split()]

clear_list = [1] * N
    
for i in range(M):
    start, end  = [int(x) for x in stdin.readline().rstrip().split()]
    for i in range(1,N+1):
        if i < start or end < i:
            clear_list[i-1] = 0

print(clear_list.count(1))


Fixed submission:
#!/usr/bin/env python
# -*- coding: utf-8 -*-

from sys import stdin

N, M = [int(x) for x in stdin.readline().rstrip().split()]

clear_list = [1] * N
start = 0
end = 0
ans_start = 0
ans_end = 0
    
for i in range(M):
    start, end  = [int(x) for x in stdin.readline().rstrip().split()]
    if ans_start == 0 or ans_start < start : 
        ans_start = start
    if ans_end == 0 or ans_end > end:
        ans_end = end

if ans_end - ans_start < 0:
    print(0)
else:
    print(ans_end - ans_start + 1 )

Buggy python submission (verdict: Time Limit Exceeded):
#!/usr/bin/env python
# -*- coding: utf-8 -*-

input_list_1 = input().split()

N = int(input_list_1[0])
M = int(input_list_1[1])
clear_list = []
for i in range(1,N+1):
    clear_list.append(i)
    
for i in range(M):
    input_list_2 = input().split()
    start = int(input_list_2[0])
    end = int(input_list_2[1])

    for i in range(1,N+1):
        if i < start or end < i:
            try:
                clear_list.remove(i)
            except:
                pass

print(len(clear_list))    


Fixed submission:
#!/usr/bin/env python
# -*- coding: utf-8 -*-

from sys import stdin

N, M = [int(x) for x in stdin.readline().rstrip().split()]

clear_list = [1] * N
start = 0
end = 0
ans_start = 0
ans_end = 0
    
for i in range(M):
    start, end  = [int(x) for x in stdin.readline().rstrip().split()]
    if ans_start == 0 or ans_start < start : 
        ans_start = start
    if ans_end == 0 or ans_end > end:
        ans_end = end

if ans_end - ans_start < 0:
    print(0)
else:
    print(ans_end - ans_start + 1 )