Harryxun/testdata huggingface dataset:
Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())
S = [int(x) for x in list(input())]
total = 0
for a in range(1000):
  tmp = [a//100,a//10%10,a%10]
  i = 0
  for x in range(N):
    if tmp[i] == S[x]:
      i+=1
    if i==3:
      total+=1
      break
print(total)

Fixed submission:
N = int(input())
S = [int(x) for x in list(input())]
total = 0
for a in range(1000):
  tmp = [a//100,a//10%10,a%10]
  i = 0
  for x in range(N):
    if tmp[i] == S[x]:
      i+=1
    if i==3:
      total+=1
      break
print(total)

Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())
S = [int(x) for x in list(input())]
total = 0
flag = True
for a in range(1000):
  flag = True
  for x in range(N-2):
    if S[x] == a//100:
      for y in range(x+1,N-1):
        if S[y] == a//10%10:
          for z in range(y+1,N):
            if a == S[x]*100+S[y]*10+S[z]:
              flag = False
              total += 1
              break
        if not flag:
          break
    if not flag:
      break
print(total)

Fixed submission:
N = int(input())
S = [int(x) for x in list(input())]
total = 0
for a in range(1000):
  tmp = [a//100,a//10%10,a%10]
  i = 0
  for x in range(N):
    if tmp[i] == S[x]:
      i+=1
    if i==3:
      total+=1
      break
print(total)

Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())
S = [int(x) for x in list(input())]
total = []
for x in range(N-2):
  for y in range(x+1,N-1):
    for z in range(y+1,N):
      total.append(S[x]*100+S[y]*10+S[z])
print(len(set(total)))


Fixed submission:
N = int(input())
S = [int(x) for x in list(input())]
total = 0
for a in range(1000):
  tmp = [a//100,a//10%10,a%10]
  i = 0
  for x in range(N):
    if tmp[i] == S[x]:
      i+=1
    if i==3:
      total+=1
      break
print(total)

Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())
S = [int(x) for x in list(input())]
total = []
for x in range(N-2):
  for y in range(x+1,N-1):
    for z in range(y+1,N):
      total.append(S[x]*100+S[y]*10+S[z])
print(len(set(total)))

Fixed submission:
N = int(input())
S = [int(x) for x in list(input())]
total = 0
for a in range(1000):
  tmp = [a//100,a//10%10,a%10]
  i = 0
  for x in range(N):
    if tmp[i] == S[x]:
      i+=1
    if i==3:
      total+=1
      break
print(total)
Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())
A = list(map(int, input().split()))
B = list(map(int, input().split()))
C = list(map(int, input().split()))
AB = []
total = 0
for i in range(len(B)):
  count = 0
  for j in range(len(A)):
    if A[j]<B[i]:
      count+=1
  AB.append(count)
for i in range(len(C)):
  for j in range(len(B)):
    if B[j]<C[i]:
      total+=AB[j]
print(total)

Fixed submission:
N = int(input())
A = list(map(int, input().split()))
B = list(map(int, input().split()))
C = list(map(int, input().split()))
A.sort()
B.sort()
C.sort()
AB = [0]*N
total = 0
for i in range(N):
  left = -1
  right = N
  while right-left>1:
    mid = left + (right-left)//2
    if A[mid]>=B[i]:
      right = mid
    else:
      left = mid
  AB[i]=right
for i in range(1,N):
  AB[i]+=AB[i-1]
for i in range(N):
  left = -1
  right = N
  while right-left>1:
    mid = left + (right-left)//2
    if B[mid]>=C[i]:
      right = mid
    else:
      left = mid
  if right!=0:
    total+=AB[right-1]
print(total)
Buggy python submission (verdict: Runtime Error):
n = int(input())
a = map(int,input().split())
a = sorted(a)

result = 0
spots = [a.pop()]

for i in range(n):
	next = a.pop()
	result += spots[i]
	spots.append(next)
	spots.append(next)
	
print(result)

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

result = 0
spots = [a.pop()]

for i in range(n-1):
	x = a.pop()
	result += spots[i]
	spots.append(x)
	spots.append(x)
	
print(result)
Buggy python submission (verdict: Runtime Error):
n = int(input())
res = 0
for i in range(1,n+1):
    k = n//i
    res += i*(k*(k+1)//2)
print res

Fixed submission:
n = int(input())
res = 0
for i in range(1,n+1):
	k = n//i
	res += i*(k*(k+1)//2)
print(res)
Buggy python submission (verdict: Runtime Error):
n = int(input())
a = list(map(int,input.split()))
a = sorted(a)
prod = 1
for x in a:
  prod *= x
  if prod > 10**18:
    prod = -1
    break
print(prod)

Fixed submission:
n = int(input())
a = list(map(int,input().split()))
a = sorted(a)
prod = 1
for x in a:
	prod *= x
	if prod > 10**18:
		prod = -1
		break
print(prod)
Buggy python submission (verdict: Runtime Error):
n,k,c = map(int,raw_input().split())
s = raw_input()
most = [0]*(n+1)
i = n
days = 0
while i > 0:
    if s[i-1] == 'o':
        days += 1
        for j in xrange(min(max(1,c),i-1)):
            #print days
            most[i-j-1] = days
        i -= (c+1)
    else:
        i -= 1
    if i<n-1:
        most[i] = most[i+1]

remain = k
i = 1
while i<=n:
    if s[i-1] == 'o':
        if most[i] < remain:
            print i
        remain -= 1
        i += c+1
    else:
        i += 1

Fixed submission:
a,b,c = map(int,raw_input().split())
print c,a,b
Buggy python submission (verdict: Runtime Error):
a,p = map(int,raw_input().split())
print (3*a+p)/2

Fixed submission:
a,p = map(int,raw_input().split())
print (3*a+p)/2
Buggy python submission (verdict: Runtime Error):
n = int(raw_input())
r = []
for i in xrange(1,n+1):
	rest,score = raw_input().split()
	score=int(score)
	r.append((rest,score,i))
r = sorted(r,key=lambda x:(x[0], -x[1], x[2]))
for x in r:
	print x[2]cd 

Fixed submission:
n = int(raw_input())
r = []
for i in xrange(1,n+1):
	rest,score = raw_input().split()
	score=int(score)
	r.append((rest,score,i))
r = sorted(r,key=lambda x:(x[0], -x[1], x[2]))
for x in r:
	print x[2]
Buggy python submission (verdict: Runtime Error):
print "Yes" if raw_input.find("AC") else print "No"

Fixed submission:
print "Yes" if raw_input().find("AC")>=0 else "No"
Buggy python submission (verdict: Time Limit Exceeded):
n = int(input());

a = list(map(int, input().split()));

ok = True;
ans = 1;
for val in a:
    ans *= val;

if(ans > 1e18):
    ok = False;
if(ok):
    print(ans);
else:
    print(-1);


Fixed submission:
n = int(input());

a = list(map(int, input().split()));

ok = True;
ans = 1;
a.sort();
for val in a:
    ans *= val;
    if(ans > 1e18):
        ok = False;
        break;
    elif(ans == 0):
        break;

if(ok):
    print(ans);
else:
    print(-1);
Buggy python submission (verdict: Time Limit Exceeded):
import sys
BIG = 10**9 + 7
def sumpp(n,a):
    acc = 0
    for i in range(n-1):
        acc += a[i] * sum(a[i+1:])
    return acc % BIG
input = sys.stdin.readline
if __name__ == "__main__":
    n = int(input())
    a = list(map(int,input().split()))
    print(sumpp(n,a))


Fixed submission:
import sys
input = sys.stdin.readline
BIG = 10**9 + 7

def sumpp(n,a):
    acc = 0
    tmp = 0
    sumv = sum(a)
    for i in range(n):
        tmp += a[i]
        acc += a[i] * (sumv - tmp)
    return acc % BIG

if __name__ == "__main__":
    n = int(input())
    a = list(map(int,input().split()))
    print(sumpp(n,a))

Buggy python submission (verdict: Time Limit Exceeded):
import sys
BIG = 10**9 + 7
def sumpp(n,a):
    acc = 0
    for i in range(n-1):
        for j in range(i+1,n):
            acc += a[i] * a[j]

    return acc % BIG
input = sys.stdin.readline
if __name__ == "__main__":
    n = int(input())
    a = list(map(int,input().split()))
    print(sumpp(n,a))
    


Fixed submission:
import sys
input = sys.stdin.readline
BIG = 10**9 + 7

def sumpp(n,a):
    acc = 0
    tmp = 0
    sumv = sum(a)
    for i in range(n):
        tmp += a[i]
        acc += a[i] * (sumv - tmp)
    return acc % BIG

if __name__ == "__main__":
    n = int(input())
    a = list(map(int,input().split()))
    print(sumpp(n,a))
Buggy python submission (verdict: Runtime Error):
import sys
input = sys.stdin.readline

def ppp(n,m,h,ab):
    g = [1] * n
    for l,r in ab:
        if h[l-1] >= h[r-1]:
            g[r-1] = 0
        if h[l-1] <= h[r-1]:
            g[l-1] = 0
    print(sum(g))
if __name__ == "__main__":
    n,m = map(int,input().split())
    h = list(map(int,input().split()))
    ab = [list(map(int,input().split())) for _ in range(m)]
    ppp(n,m,h,ab_sorted)


Fixed submission:
import sys
input = sys.stdin.readline

def peaks(n,m,h,ab):
    g = [0] * n
    path = [ [] for i in range(n)]
    #print(ab)
    for l,r in ab:
        path[l-1].append(r)
        path[r-1].append(l)

    #print(path)

    for i,p in enumerate(path):
        if p == []:
            g[i] = 1
            continue
        
        for j in p:
            #print(i+1,j,h[i],h[j-1])
            if h[i] > h[j-1]:
                g[i] = 1
            else:
                g[i] = 0
                break
    print(sum(g))

if __name__ == "__main__":
    n,m = map(int,input().split())
    h = list(map(int,input().split()))
    ab = [list(map(int,input().split())) for _ in range(m)]
    ab_sorted = sorted(ab)
    peaks(n,m,h,ab_sorted)
Buggy python submission (verdict: Runtime Error):
def tax_increase(a,b):

    al = [a+(i / 10) for i in range(0,10,1)]
    bl = [b+(i / 10) for i in range(0,10,1)]
    #print(al)
    #print(bl)

    atx8 = list(map(lambda x: x/t8 ,al))
    btx10 = list(map(lambda x: x/t10 ,bl))
    #print(atx8)
    #print(btx10)

    for i in atx8:
        if i in btx10:
            return i
        else:
            pass
    return -1

if __name__ == '__main__':
    a,b = map(int,input().split())
    ans = int(tax_increase(a,b))
    print(ans)

Fixed submission:
def tax_increase(a,b):
    t8  = 0.08
    t10 = 0.1
    for i in range(b*10,(b+1)*10,1):
        if int(i*t8) == a:
            return i
    return -1
    
if __name__ == '__main__':
    a,b = map(int,input().split())
    ans = int(tax_increase(a,b))
    print(ans)
Buggy python submission (verdict: Runtime Error):
if __name__ == '__main__':
3    r = int(raw_input())
4
5    print 3*r*r

Fixed submission:
if __name__ == '__main__':
    r = int(raw_input())
    print 3*r*r
Buggy python submission (verdict: Time Limit Exceeded):
def pbox(n,a):
    count = 0
    result = []
    for i in xrange(n):
        total = 0
        b = [a[j] for j in xrange(n) if (j+1)%(i+1) == 0]
#        print("i %d, b %s" %(i+1,b))
        total = sum(b)
#        print("a[i] %d, total %d" %(a[i],total))
        if total % 2 == 1 and a[i] % 2 == 1:
            result.append(i+1)
            count += 1
        else:
            pass

    m = len(result)
    print count
    for i in xrange(m):
        print result[i],

if __name__ == '__main__':
    n = int(raw_input())
    a = map(int,raw_input().split())

    pbox(n,a)

Fixed submission:
def pbox(n,a):
    count = 0
    result = []
    x=[0]*n
    for i in xrange(n,0,-1):
        total = 0
        for j in xrange(i,n+1,i):
            total += x[j-1]
        if  total % 2 != a[i-1]:
            x[i-1]=1
            result.append(i)
        else:
            pass
 
    print len(result)
    print ' '.join(map(str,result))
 
if __name__ == '__main__':
    n = int(raw_input())
    a = map(int,raw_input().split())
 
    pbox(n,a)
Buggy python submission (verdict: Runtime Error):
def remainder_min(l,r):
    sml = 2*(10**9)**2+1
    lsml = 2*(10**9)**2+1
    rsml = 2*(10**9)**2+1
    for i in range(l,r):
        lrem = i % 2019

        if lsml > lrem:
            lsml = lrem
            break
        else:
            break

    for j in range(l+1,r+1):
        rrem = j % 2019

        if rsml > rrem:
            rsml = rrem
            break
        else:
            break

    return lrem*rrem


if __name__ == '__main__':
    l,r = map(int,raw_input().split())
    print remainder_min(l,r)

Fixed submission:
def remainder_min(l,r):
    sml = 2*(10**9)**2+1
    _r = min(r,l+2019)
    for i in range(l,_r):
        for j in range(i+1,_r+1):
            num = i * j
            rem = num % 2019
            if rem == 0:
                return 0
            sml = min(sml,rem)
    return sml

if __name__ == '__main__':
    l,r = map(int,raw_input().split())
    print remainder_min(l,r)

Buggy python submission (verdict: Runtime Error):
def remainder_min(l,r):
    opt = 0
    gt = 2*(10**9)**2+1
    for j in range(l,r+1):
        for i in range(l,j):
            opt = (i * j) % 2019
#            print("i = %d, j = %d, opt = %d" %(i,j,opt))
            if gt > opt:
                gt = opt
    return gt
if __name__ == '__main__':
    l,r = map(int,raw_input().split())
    print remainder_min(l,r)

Fixed submission:
def remainder_min(l,r):
    sml = 2*(10**9)**2+1
    _r = min(r,l+2019)
    for i in range(l,_r):
        for j in range(i+1,_r+1):
            num = i * j
            rem = num % 2019
            if rem == 0:
                return 0
            sml = min(sml,rem)
    return sml

if __name__ == '__main__':
    l,r = map(int,raw_input().split())
    print remainder_min(l,r)

Buggy python submission (verdict: Runtime Error):
    opt = 0
    gt = 2*(10**9)**2+1
    for j in range(l,r+1):
        for i in range(l,j):
            opt = (i * j) % 2019
            if gt > opt:
                gt = opt
    return gt
if __name__ == '__main__':
    l,r = map(int,raw_input().split())
    print remainder_min(l,r)

Fixed submission:
def remainder_min(l,r):
    sml = 2*(10**9)**2+1
    _r = min(r,l+2019)
    for i in range(l,_r):
        for j in range(i+1,_r+1):
            num = i * j
            rem = num % 2019
            if rem == 0:
                return 0
            sml = min(sml,rem)
    return sml

if __name__ == '__main__':
    l,r = map(int,raw_input().split())
    print remainder_min(l,r)
Buggy python submission (verdict: Runtime Error):
if __name__ == '__main__':
    w,h,x,y = map(int,input().split())
    if x + x == w and y + y == h::
        a = 1
    else:
        a = 0

    print("%f %d" %(w*h/2, a))

Fixed submission:
if __name__ == '__main__':
    w,h,x,y = map(int,input().split())
    if x + x == w and y + y == h:
        a = 1
    else:
        a = 0

    print("%f %d" %(w*h/2, a))
Buggy python submission (verdict: Runtime Error):
big = 10**9 + 7

def typical_stairs(n,m,a):

    flag = [True]*(n+1)
    for i in range(m):
        tmp = a[i]
        flag[tmp] = False

    route = [0]*(n+1)
    route[0] = 1
    if flag[1]:
        route[1] = 1
    else:
        route[1] = 0

    for i in range(2,n+1):
        if flag[i]:
            route[i] = route[i-1] + route[i-2]

        ans = route[i]

    return ans%big
if __name__ == '__main__':
    n,m = map(int,raw_input().split())
    a = [int(raw_input()) for _ in range(m)]

    print typical_stairs(n,m,a)

Fixed submission:
big = 10**9 + 7

def typical_stairs(n,m,a):

    flag = [True]*(n+1)
    for i in range(m):
        tmp = a[i]
        flag[tmp] = False

    route = [0]*(n+1)
    route[0] = 1
    ans = route[0]
    if flag[1]:
        route[1] = 1
    else:
        route[1] = 0

    for i in range(2,n+1):
        if flag[i]:
            route[i] = route[i-1] + route[i-2]

        ans = route[i]

    return ans%big
if __name__ == '__main__':
    n,m = map(int,raw_input().split())
    a = [int(raw_input()) for _ in range(m)]
    print typical_stairs(n,m,a)

Buggy python submission (verdict: Time Limit Exceeded):
big = 10**9 + 7

def typical_stairs(n,m,a):

    route = [0]*(n+1)
    route[0] = 1
    ans = route[0]
    tmp = 0
    a.append(-1)
    for j in range(m+1):
        for i in range(tmp,n):
            if a[j] == i+1:
                #print("a=%d, i+2=%d "%(a[j],i+2))
                route[i+1] = 0
                tmp = a[j]
                #print("route%d, %d = 0 + 0, route-> %s"%(i+1,route[i+1],route))
                if route[i] == 0 and route[i+1] == 0:
                    return 0
                else:
                    break
            else:
                route[i+1] = route[i] + route[i-1]

                #print("route%d, %d = %d + %d, route-> %s"%(i+1,route[i+1],route[i],route[i-1],route))
            ans = route[i+1]
    return ans%big
if __name__ == '__main__':
    n,m = map(int,raw_input().split())
    a = [int(raw_input()) for _ in range(m)]

    print typical_stairs(n,m,a)

Fixed submission:
big = 10**9 + 7

def typical_stairs(n,m,a):

    flag = [True]*(n+1)
    for i in range(m):
        tmp = a[i]
        flag[tmp] = False

    route = [0]*(n+1)
    route[0] = 1
    ans = route[0]
    if flag[1]:
        route[1] = 1
    else:
        route[1] = 0

    for i in range(2,n+1):
        if flag[i]:
            route[i] = route[i-1] + route[i-2]

        ans = route[i]

    return ans%big
if __name__ == '__main__':
    n,m = map(int,raw_input().split())
    a = [int(raw_input()) for _ in range(m)]
    print typical_stairs(n,m,a)
Buggy python submission (verdict: Time Limit Exceeded):
def unification(n,s,count):
    if n < 1:
        return count

    for i in range(n-1):
        if s[i] !=  s[i+1]:
            s.pop(i)
            s.pop(i)
            return unification(n-2,s,count+2)

    return count

if __name__ == '__main__':
    s = raw_input()
    n = len(s)
    _s = [i for i in s]

    print unification(n,_s,0)

Fixed submission:
def unification(n,s):
    rc = 0
    bc = 0

    for c in s:
        if c == '0':
            rc += 1
        elif c == '1':
            bc += 1
        else:
            break

    return min(rc,bc) * 2

if __name__ == '__main__':
    s = raw_input()
    n = len(s)
    _s = [i for i in s]

    print unification(n,_s)
Buggy python submission (verdict: Time Limit Exceeded):
def christmas_eve(n,k,h):
    _h = sorted(h)
    opt = 0
    ans = 10**9 + 1

    for i in range(n-(k-1)):
        l = _h[i:i+k]
        opt = max(l) - min(l)
        if ans > opt:
            ans = opt

    return ans
if __name__ == '__main__':
    n,k = map(int,raw_input().split())
    h = [int(raw_input()) for _ in range(n)]


    print christmas_eve(n,k,h)

Fixed submission:
def christmas_eve(n,k,h):
    _h = sorted(h)
    opt = 0
    ans = 10**9 + 1
    _k = k - 1
    loop = n - _k
    for i in range(loop):
        opt = _h[i+_k] - _h[i]
        if ans >= opt:
            ans = opt

    return ans
if __name__ == '__main__':
    n,k = map(int,raw_input().split())
    h = [int(raw_input()) for _ in range(n)]

    print christmas_eve(n,k,h)
Buggy python submission (verdict: Runtime Error):
def seven_five_five(n):
    s = list(str(n))
    len_s = len(s)
    semi_753 = []
    for j in range(3,len_s+1):
        for i in itertools.product(['3','5','7'],repeat=j):
            l = ''.join(i)
            #print l
            semi_753.append(l)

    target = [i for i in semi_753 if int(i) > 356 and int(i) <= n]
    #print target
    count = 0
    for i in target:
        v = str(i)
        flag = [False,False,False]
        for j in list(v):
            if j == '7':
                flag[0] = True
            elif j == '5':
                flag[1] = True
            elif j == '3':
                flag[2] = True
            else:
                break

            if flag[0] and flag[1] and flag[2]:
                #print i
                count += 1
                break
    print count
if __name__ == '__main__':
    n =  int(raw_input())
    seven_five_five(n)

Fixed submission:
import itertools

def seven_five_five(n):
    s = list(str(n))
    len_s = len(s)
    semi_753 = []
    for j in range(3,len_s+1):
        for i in itertools.product(['3','5','7'],repeat=j):
            l = ''.join(i)
            #print l
            semi_753.append(l)

    target = [i for i in semi_753 if int(i) > 356 and int(i) <= n]
    #print target
    count = 0
    for i in target:
        v = str(i)
        flag = [False,False,False]
        for j in list(v):
            if j == '7':
                flag[0] = True
            elif j == '5':
                flag[1] = True
            elif j == '3':
                flag[2] = True
            else:
                break

            if flag[0] and flag[1] and flag[2]:
                #print i
                count += 1
                break
    print count
if __name__ == '__main__':
    n =  int(raw_input())
    seven_five_five(n)
Buggy python submission (verdict: Runtime Error):
N, X = map(int, input().split())
L = list(map(int, input().split()))
cnt = 1
Len = 0
for i in range(X):
	Len += L[i]
	if Len > X:
		break
	cnt += 1

print(cnt)

Fixed submission:
N, X = map(int, input().split())
L = list(map(int, input().split()))
cnt = 1
Len = 0
for i in range(len(L)):
	Len += L[i]
	if Len > X:
		break
	cnt += 1

print(cnt)
Buggy python submission (verdict: Runtime Error):
if "##" in S[A-1:C]:
	print("No")
elif "##" in S[B-1:D]:
	print("No")
elif D < C:	# A jumps over B
	if not "..." in S[B-2:D+1]:
		print("No")
	else:
		print("Yes")
else:
	print("Yes")

Fixed submission:
N, A, B, C, D = map(int, input().split())
S = input()	# .#

if "##" in S[A-1:C]:
	print("No")
elif "##" in S[B-1:D]:
	print("No")
elif D < C:	# A jumps over B
	if not "..." in S[B-2:D+1]:
		print("No")
	else:
		print("Yes")
else:
	print("Yes")

Buggy python submission (verdict: Runtime Error):
if "##" in S[A-1:C]:
	print("No")
elif "##" in S[B-1:D]:
	print("No")
elif D < C:	# A jumps over B
	if not "..." in S[B-1:C]:
		print("No")
	elif S[B-1:D].count("...") < 2:
		if S[D-2:D+1] == "#..":
			print("No")
		else:
			print("Yes")
	else:
		print("Yes")
else:
	print("Yes")

Fixed submission:
N, A, B, C, D = map(int, input().split())
S = input()	# .#

if "##" in S[A-1:C]:
	print("No")
elif "##" in S[B-1:D]:
	print("No")
elif D < C:	# A jumps over B
	if not "..." in S[B-2:D+1]:
		print("No")
	else:
		print("Yes")
else:
	print("Yes")
Buggy python submission (verdict: Time Limit Exceeded):
N, M = map(int, input().split())
m = 0b0
exec("m = 0b" + "1"*N)
for i in range(M):
	L, R = map(int, input().split())
	exec("_m = 0b" + "1"*(R - L + 1) + "0"*(N - R))
	m = m & _m
	if m == 0b0 : break

print(bin(m).count("1"))


Fixed submission:
N, M = map(int, input().split())
L, R = 0, N
for i in range(M):
	_L, _R = map(int, input().split())
	L = max(_L, L)
	R = min(_R, R)

print(max(R - L + 1, 0))

Buggy python submission (verdict: Time Limit Exceeded):
N, M = map(int, input().split())
m = set(range(N))
for i in range(M):
	L, R = map(int, input().split())
	_m = set(range(L-1, R))
	m = m & _m
	if m == set() : break
print(len(m))

Fixed submission:
N, M = map(int, input().split())
L, R = 0, N
for i in range(M):
	_L, _R = map(int, input().split())
	L = max(_L, L)
	R = min(_R, R)

print(max(R - L + 1, 0))

Buggy python submission (verdict: Time Limit Exceeded):
N, M = map(int, input().split())
m = set(range(N))
for i in range(M):
	L, R = map(int, input().split())
	_m = set(range(L-1, R))
	m = m & _m
print(len(m))


Fixed submission:
N, M = map(int, input().split())
L, R = 0, N
for i in range(M):
	_L, _R = map(int, input().split())
	L = max(_L, L)
	R = min(_R, R)

print(max(R - L + 1, 0))
Buggy python submission (verdict: Runtime Error):
N, X = map(int, input().split())
hight, paty = [0]*51, [0]*51
hight[0] = 1
paty[0] = 1

for i in range(1, 51):
	hight[i] = 2*hight[i-1] + 3
	paty[i] = 2*paty[i-1] + 1

def f(n, x):
	if x == 0: return 0

	if x < hight[n]//2:
		return f(n-1, x-1)
	if x >= hight[n]//2 :
		return paty[n-1] + 1 + f(n-1, x-hight[n-1]-2)

print(f(N, X))

Fixed submission:
N, X = map(int, input().split())
hight, paty = [0]*51, [0]*51
hight[0] = 1
paty[0] = 1

for i in range(1, 51):
	hight[i] = 2*hight[i-1] + 3
	paty[i] = 2*paty[i-1] + 1

def f(n, x):
	if x == 0: return 0
	elif n == 0: return 1

	elif x <= (hight[n-1]+1):
		return f(n-1, x-1)
	else:
		return paty[n-1] + 1 + f(n-1, x-hight[n-1]-2)

print(f(N, X))

Buggy python submission (verdict: Runtime Error):
T = [1]*(N + 1)
P = [1]*(N + 1)
for i in range(1, N+1):
	P[i] = P[i-1]*2 + 1
	T[i] = T[i-1]*2 + 3
def pate(n, x):
	if n == 0:
		if x > 0: return 1
		return 0
	mid = T[n]//2
	if x < mid:
		return pate(n-1, x-1)
	elif mid == x:
		return 1 + pate(n-1, x-2)
	else:
		return P[n-1] + 1 + pate(n-1, x-mid-1)

print(pate(N, X))


Fixed submission:
N, X = map(int, input().split())
hight, paty = [0]*51, [0]*51
hight[0] = 1
paty[0] = 1

for i in range(1, 51):
	hight[i] = 2*hight[i-1] + 3
	paty[i] = 2*paty[i-1] + 1

def f(n, x):
	if x == 0: return 0
	elif n == 0: return 1

	elif x <= (hight[n-1]+1):
		return f(n-1, x-1)
	else:
		return paty[n-1] + 1 + f(n-1, x-hight[n-1]-2)

print(f(N, X))