Harryxun/testdata huggingface dataset:
Buggy python submission (verdict: Time Limit Exceeded):
n = int(input())
T = tuple(map(int, input()))
ans = 0
for i in range(0, 1000):
    a = i // 100
    b = (i // 10) % 10
    c = i % 10
    flag1 = False
    flag2 = False
    flag3 = False
    for t in T:
        if flag2:
            if t == c:
                flag3 = True
                break
        if flag1:
            if t == b:
                flag2 = True
                continue
        if t == a:
            flag1 = True

    if flag3:
        ans += 1
print(ans)


Fixed submission:
def main():
    n = int(input())
    T = tuple(map(int, input()))
    ans = 0
    for i in range(0, 1000):
        a = i // 100
        b = (i // 10) % 10
        c = i % 10
        flag1 = False
        flag2 = False
        flag3 = False
        for t in T:
            if flag2:
                if t == c:
                    flag3 = True
                    break
            if flag1:
                if t == b:
                    flag2 = True
                    continue
            if t == a:
                flag1 = True

        if flag3:
            ans += 1
    print(ans)
if __name__ == "__main__":
    main()

Buggy python submission (verdict: Time Limit Exceeded):
n = int(input())
T = tuple(map(int, input()))
ans = 0
for i in range(0, 1000):
    a = i // 100
    b = (i // 10) % 10
    c = i % 10
    flag1 = False
    flag2 = False
    flag3 = False
    for t in T:
        if flag2:
            if t == c:
                flag3 = True
                break
        if flag1:
            if t == b:
                flag2 = True
                continue
        if t == a:
            flag1 = True

    if flag3:
        ans += 1
print(ans)


Fixed submission:
def main():
    n = int(input())
    T = tuple(map(int, input()))
    ans = 0
    for i in range(0, 1000):
        a = i // 100
        b = (i // 10) % 10
        c = i % 10
        flag1 = False
        flag2 = False
        flag3 = False
        for t in T:
            if flag2:
                if t == c:
                    flag3 = True
                    break
            if flag1:
                if t == b:
                    flag2 = True
                    continue
            if t == a:
                flag1 = True

        if flag3:
            ans += 1
    print(ans)
if __name__ == "__main__":
    main()
Buggy python submission (verdict: Runtime Error):
S = input()
ans = 0
S = S.repace("><"/, ">,<").split(",")
for s in S:
  a = s.count(">")
  b = s.count("<")
  ans += a * (a - 1) // 2 + b * (b - 1) // 2 + max(a, b)
print(ans)

Fixed submission:
S = input()
ans = 0
S = S.replace("><", ">,<").split(",")
for s in S:
  a = s.count(">")
  b = s.count("<")
  ans += a * (a - 1) // 2 + b * (b - 1) // 2 + max(a, b)
print(ans)
Buggy python submission (verdict: Time Limit Exceeded):
from sys import exit
N = int(input())
n = int(N ** 0.5)
for i in range(n, N + 1):
  if N % i == 0:
    ans = i + N // i - 2
    print(ans)
    exit()


Fixed submission:
N = int(input())
n = int(N ** 0.5)
for i in range(n, 0, -1):
  if N % i == 0:
    ans = i + N // i - 2
    print(ans)
    break

Buggy python submission (verdict: Time Limit Exceeded):
from sys import exit
N = int(input())
n = int(N ** 0.5)
for i in range(n, N + 1):
  if N % i == 0:
    ans = i + N // i - 2
    print(ans)
    exit()

Fixed submission:
N = int(input())
n = int(N ** 0.5)
for i in range(n, 0, -1):
  if N % i == 0:
    ans = i + N // i - 2
    print(ans)
    break
Buggy python submission (verdict: Runtime Error):
from math import atan, degrees
a, b, x = map(int, input().split())
x = x / a ** 2
if x >= b / 2:
    print(90-degrees(atan(a / (2 * b - 2 * x))))
else:
    print(90-degrees(atan(2 * a * x / b ** 2)))


Fixed submission:
from math import atan, degrees
a, b, x = map(int, input().split())
if x == a * b * b:
    print(0)
else:
    x = x / a ** 2
    if x >= b / 2:
        print(90-degrees(atan(a / (2 * b - 2 * x))))
    else:
        print(90-degrees(atan(2 * a * x / b ** 2)))

Buggy python submission (verdict: Runtime Error):
from math import atan, degrees
a, b, x = map(int, input().split())
x = x / a ** 2
if x >= b / 2:
    print(degrees(atan(a / (2 * b - 2 * x))))
else:
    print(degrees(atan(2 * a * x / b ** 2)))


Fixed submission:
from math import atan, degrees
a, b, x = map(int, input().split())
if x == a * b * b:
    print(0)
else:
    x = x / a ** 2
    if x >= b / 2:
        print(90-degrees(atan(a / (2 * b - 2 * x))))
    else:
        print(90-degrees(atan(2 * a * x / b ** 2)))

Buggy python submission (verdict: Runtime Error):
from math import atan
a, b, x = map(int, input().split())
x = x / a ** 2
if x >= b / 2:
    print(atan(a / (2 * b - 2 * x)))
else:
    print(atan(2 * a * x / b ** 2))

Fixed submission:
from math import atan, degrees
a, b, x = map(int, input().split())
if x == a * b * b:
    print(0)
else:
    x = x / a ** 2
    if x >= b / 2:
        print(90-degrees(atan(a / (2 * b - 2 * x))))
    else:
        print(90-degrees(atan(2 * a * x / b ** 2)))
Buggy python submission (verdict: Time Limit Exceeded):
import bisect
n, m = map(int, input().split())
A = sorted(map(int, input().split()))
for _ in range(m):
    a = A[-1]//2
    A=A[:-1]
    bisect.insort(A,a)
print(sum(A))


Fixed submission:
import heapq
n, m = map(int, input().split())
A = sorted(map(lambda x: -int(x), input().split()))
for _ in range(m):
    a = heapq.heappop(A)
    a = -(-a//2)
    heapq.heappush(A, a)

print(-sum(A))

Buggy python submission (verdict: Time Limit Exceeded):
n, m = map(int, input().split())
A = sorted(map(int, input().split()))
for _ in range(m):
    A[-1]=A[-1]//2
    A.sort()

print(sum(A))


Fixed submission:
import heapq
n, m = map(int, input().split())
A = sorted(map(lambda x: -int(x), input().split()))
for _ in range(m):
    a = heapq.heappop(A)
    a = -(-a//2)
    heapq.heappush(A, a)

print(-sum(A))
Buggy python submission (verdict: Runtime Error):
from collections import deque
N = int(input())
B = deque(map(int, input().split()))
base = B.popleft()
ans = base
while B:
  tmp = B.popleft()
  ans += min(base, tmp)
  base = tmp
ans += tmp
print(ans)

Fixed submission:
from collections import deque
N = int(input())
B = deque(map(int, input().split()))
base = B.popleft()
ans = base
while B:
  tmp = B.popleft()
  ans += min(base, tmp)
  base = tmp
ans += base
print(ans)
Buggy python submission (verdict: Runtime Error):
N = int(input())
N -= 1
D = deque(sorted(list(map(int, input().split()))))
ans = D.popleft() / (2 ** N)
while D:
  d = D.popleft()
  ans += d / (2 ** N)
  N -= 1
print(ans)

Fixed submission:
from collections import deque
N = int(input())
N -= 1
D = deque(sorted(list(map(int, input().split()))))
ans = D.popleft() / (2 ** N)
while D:
  d = D.popleft()
  ans += d / (2 ** N)
  N -= 1
print(ans)
Buggy python submission (verdict: Time Limit Exceeded):
from collections import Counter
N = int(input())
S =[Counter(input()) for i in range(N)]
ans = 0
for i in range(N - 1):
  for j in range(i + 1, N):
    if S[i] == S[j]:
      ans += 1
print(ans)

Fixed submission:
N = int(input())
S = ["".join(sorted(input())) for i in range(N)]
d = {}
ans = 0
for s in S:
  if s in d:
    ans += d[s]
    d[s] += 1
  else:
    d[s] = 1
print(ans)
Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())
A = []
for i in range(N):
  A.append(int(input()))
for i in range(N):
  a = A.copy()
  del a[i]
  print(max(a))

Fixed submission:
N = int(input())
A = []
for i in range(N):
  A.append(int(input()))
a = sorted(A)
max = a[-1]
if max == a[-2]:
  for i in range(N):
    print(max)
else:
  n = A.index(max)
  for i in range(N):
    if i == n:
      print(a[-2])
      continue
    print(max)

Buggy python submission (verdict: Runtime Error):
N = int(input())
A = []
for i in range(N):
  A.append(int(input()))
for i in range(N):
  a = A
  del a[i]
  print(max(a))

Fixed submission:
N = int(input())
A = []
for i in range(N):
  A.append(int(input()))
a = sorted(A)
max = a[-1]
if max == a[-2]:
  for i in range(N):
    print(max)
else:
  n = A.index(max)
  for i in range(N):
    if i == n:
      print(a[-2])
      continue
    print(max)
Buggy python submission (verdict: Runtime Error):
L, R = map(int, input().split())
l = L % 2019
r = R % 2019
w = R - L
if s + w >= 2019:
  print(0)
else:
  print(min((s * (s + 1))% 2019, (l * (l - 1)) % 2019)

Fixed submission:
L, R = map(int, input().split())
l = L % 2019
r = R % 2019
w = R - L
if l + w >= 2019:
  print(0)
else:
  ans = 2019
  for i in range(l, r + 1):
    for j in range(i + 1, r + 1):
      ans = min(ans, (i * j) % 2019)
  print(ans)
Buggy python submission (verdict: Runtime Error):
N = int(input())
D = list(map(int, input().split()))
D.sort()
print(D[N//2 + 1] - D[N//2])

Fixed submission:
N=int(input())//2
D=sorted(list(map(int,input().split())))
print(D[N]-D[N-1])
Buggy python submission (verdict: Runtime Error):
A, B, C, D = map(int, input().split())
A -= 1
X = gcd(C, D)
print(B - B//C - B//D + B//(C*D//X) - A + A//C + A//D -A//(C*D//X))

Fixed submission:
from fractions import gcd
A, B, C, D = map(int, input().split())
A -= 1
X = gcd(C, D)
print(B - B//C - B//D + B//(C*D//X) - A + A//C + A//D -A//(C*D//X))
Buggy python submission (verdict: Runtime Error):
from sys import exit
class Fib:
  def __init__(self):
    self.memo = {}
  def calc(self, n):
    if n == 1 or n == 2:
      self.memo[n] = 1
      return 1
    if n <= 0:
      self.memo[n] = 0
      return 0
    if n in self.memo.keys():
      return self.memo[n]
    self.memo[n] = self.calc(n - 1) + self.calc(n - 2)
    return self.memo[n]

N, M = map(int, input().split())
ans = 1
mod = 10 ** 9 + 7
pre = -1
for i in range(M):
  a = int(input())
  if a == 1:
    pre = a
    continue
  if a == pre + 1 and pre != 0:
    print(0)
    exit()
  ans *= Fib().calc(a - pre - 1) % mod
  pre = a
ans *= Fib().calc(N - pre) % mod
print(ans % mod)

Fixed submission:
import sys
class Fib:
  def __init__(self):
    self.memo = {}
  def calc(self, n):
    if n == 1 or n == 2:
      self.memo[n] = 1
      return 1
    if n <= 0:
      self.memo[n] = 0
      return 0
    if n in self.memo.keys():
      return self.memo[n]
    self.memo[n] = self.calc(n - 1) + self.calc(n - 2)
    return self.memo[n]
sys.setrecursionlimit(200000)
N, M = map(int, input().split())
ans = 1
mod = 10 ** 9 + 7
pre = -1
for i in range(M):
  a = int(input())
  if a == 1:
    pre = a
    continue
  if a == pre + 1 and pre != 0:
    print(0)
    sys.exit()
  ans *= Fib().calc(a - pre - 1) % mod
  pre = a
ans *= Fib().calc(N - pre) % mod
print(ans % mod)

Buggy python submission (verdict: Runtime Error):
from sys import exit
class Fib:
  def __init__(self):
    self.memo = {}
  def calc(self, n):
    if n == 1 or n == 2:
      self.memo[n] = 1
      return 1
    if n <= 0:
      self.memo[n] = 0
      return 0
    if n in self.memo.keys():
      return self.memo[n]
    self.memo[n] = self.calc(n - 1) + self.calc(n - 2)
    return self.memo[n]

N, M = map(int, input().split())
ans = 1
mod = 10 ** 9 + 7
pre = 0
for i in range(M):
  a = int(input())
  if a == 1:
    pre = a
    continue
  if a == pre + 1 and pre != 0:
    print(0)
    exit()
  ans *= Fib().calc(a - pre - 1) % mod
  pre = a
ans *= Fib().calc(N - pre) % mod
print(ans % mod)

Fixed submission:
import sys
class Fib:
  def __init__(self):
    self.memo = {}
  def calc(self, n):
    if n == 1 or n == 2:
      self.memo[n] = 1
      return 1
    if n <= 0:
      self.memo[n] = 0
      return 0
    if n in self.memo.keys():
      return self.memo[n]
    self.memo[n] = self.calc(n - 1) + self.calc(n - 2)
    return self.memo[n]
sys.setrecursionlimit(200000)
N, M = map(int, input().split())
ans = 1
mod = 10 ** 9 + 7
pre = -1
for i in range(M):
  a = int(input())
  if a == 1:
    pre = a
    continue
  if a == pre + 1 and pre != 0:
    print(0)
    sys.exit()
  ans *= Fib().calc(a - pre - 1) % mod
  pre = a
ans *= Fib().calc(N - pre) % mod
print(ans % mod)
Buggy python submission (verdict: Time Limit Exceeded):
n, q = map(int, input().split())
s = input()
for _ in range(q):
    l, r = map(int, input().split())
    print(s[l-1:r].count("AC")) 

Fixed submission:
n, q = map(int, input().split())
S = input()
flag = False
L = [0 for _ in range(n)]
cnt = 0
for i, s in enumerate(S):
    if flag:
        if s == "C":
            cnt += 1
        flag = False
    if s == "A":
        flag = True
    L[i] = cnt

for _ in range(q):
    l, r = map(lambda x: int(x) - 1, input().split())
    print(L[r] - L[l])
Buggy python submission (verdict: Time Limit Exceeded):
n, p = map(int, input().split())
prime = set()
ans = 1
for i in range(2, p + 1):
    for x in prime:
        if i % x == 0:
            break
    else:
        prime.add(i)
        cnt = 0
        while p % i == 0:
            p //= i
            cnt += 1
        if cnt >= n:
            ans *= i * (cnt // n)

print(ans)


Fixed submission:
from copy import deepcopy
from math import ceil
n, p = map(int, input().split())
ans = 1
q = deepcopy(p)
for i in range(2, int(p ** 0.5) + 2):
    cnt = 0
    while p % i == 0:
        p //= i
        cnt += 1
    if cnt > 0:
        ans *= i ** (cnt // n)

print(ans if p != q and n != 1 else q)

Buggy python submission (verdict: Time Limit Exceeded):
n, p = map(int, input().split())
prime = {2, }
for i in range(3, p + 1):
    for x in prime:
        if i % x == 0:
            break
    else:
        prime.add(i)

ans = 1
for x in prime:
    cnt = 0
    while p % x == 0:
        p //= x
        cnt += 1
    if cnt // n != 0:
        ans *= x * (cnt // n)

print(ans)


Fixed submission:
from copy import deepcopy
from math import ceil
n, p = map(int, input().split())
ans = 1
q = deepcopy(p)
for i in range(2, int(p ** 0.5) + 2):
    cnt = 0
    while p % i == 0:
        p //= i
        cnt += 1
    if cnt > 0:
        ans *= i ** (cnt // n)

print(ans if p != q and n != 1 else q)
Buggy python submission (verdict: Runtime Error):
N, K = map(int, input().split())
A = list(map(int, input().split()))

mini = min(A)
idx = N + 1
mid = N / 2

for i, a in enumerate(A):
  if a == mini and abs(idx - mid) > abs(i - mid):
    idx = i

ans = i // (K - 1)
rem = i % (K - 1)
if rem:
  ans += 1
  if (N - i - 1 - (K - rem)) // (K - 1) > 0:
    ans += (N - i - 1 - (K - rem)) // (K - 1)
    if (N - i - 1 - (K - rem)) % (K - 1) != 0:
      ans += 1
else:
  if (N - i - 1) // (K - 1) > 0:
    ans += (N - i - 1) // (K - 1)
    if (N - i - 1) % (K - 1) != 0::
        ans += 1
print(ans)

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

mini = min(A)
idx = N + 1
mid = N / 2

for i, a in enumerate(A):
  if a == mini and abs(idx - mid) > abs(i - mid):
    idx = i

ans = i // (K - 1)
rem = i % (K - 1)
if rem:
  ans += 1
  if (N - i - 1 - (K - rem)) // (K - 1) > 0:
    ans += (N - i - 1 - (K - rem)) // (K - 1)
    if (N - i - 1 - (K - rem)) % (K - 1) != 0:
      ans += 1
else:
  if (N - i - 1) // (K - 1) > 0:
    ans += (N - i - 1) // (K - 1)
    if (N - i - 1) % (K - 1) != 0:
        ans += 1
print(ans)
Buggy python submission (verdict: Runtime Error):
N, X = map(int. input().split())
M =[int(input()) for i in range(N)]
X -= sum(M)
M.sort()
n = N
while X > M[-1]:
  n += 1
  X -= M[-1]
print(n)

Fixed submission:
N, X = map(int, input().split())
M =[int(input()) for i in range(N)]
X -= sum(M)
M.sort()
n = N
while X >= M[0]:
  n += 1
  X -= M[0]
print(n)
Buggy python submission (verdict: Runtime Error):
S = input()
if len(S) == 26:
    done = set()
    for i, s in enumerate(S[::-1]):
        s = ord(s)
        if done:
            if max(done) < s:
                done.add(s)
                if i == 25:
                    print(-1)
            elif i != 25:
                print(S[: -(i + 1)] + chr(min(done)))
                break
            else:
                print(chr(ord(S[0] + 1)))
        else:
            done.add(s)
else:
    for i in range(ord("a"), ord("z") + 1):
        if not (chr(i) in S):
            print(S + chr(i))
            break

Fixed submission:
S = input()
if len(S) == 26:
    done = set()
    for i, s in enumerate(S[::-1]):
        s = ord(s)
        if done:
            if max(done) < s:
                done.add(s)
                if i == 25:
                    print(-1)
            elif i != 25:
                l = 30
                for d in done:
                    if l > abs(d - s) and s < d:
                        x = d
                        l = d - s
                print(S[: -(i + 1)] + chr(x))
                break
            else:
                print(chr(ord(S[0]) + 1))
        else:
            done.add(s)
else:
    for i in range(ord("a"), ord("z") + 1):
        if not (chr(i) in S):
            print(S + chr(i))
            break

Buggy python submission (verdict: Runtime Error):

S = input()
L = list(map(ord, S))
if len(S) == 26:
    if S == "zyxwvutsrqponmlkjihgfedcba":
        print(-1)
    else:
        pre = set()
        for i, l in enumerate(L[::-1]):
            if pre:
                if min(pre) > l:
                    print(reversed(reversed(S)[i + 1 :]) + chr(min(pre)))
                    break
            pre.add(l)
else:
    for _ in range(ord("a"), ord("z") + 1):
        if not (i in L):
            break
    print(S + chr(i))

Fixed submission:
S = input()
if len(S) == 26:
    done = set()
    for i, s in enumerate(S[::-1]):
        s = ord(s)
        if done:
            if max(done) < s:
                done.add(s)
                if i == 25:
                    print(-1)
            elif i != 25:
                l = 30
                for d in done:
                    if l > abs(d - s) and s < d:
                        x = d
                        l = d - s
                print(S[: -(i + 1)] + chr(x))
                break
            else:
                print(chr(ord(S[0]) + 1))
        else:
            done.add(s)
else:
    for i in range(ord("a"), ord("z") + 1):
        if not (chr(i) in S):
            print(S + chr(i))
            break
Buggy python submission (verdict: Runtime Error):
from itertools import accumulate
N = int(input())
A = tuple([0,] + list(map(int, input().split())) + [0,])
D = []
sum = 0
for i, a in enumarate(A[1:-1]):
  i += 1
  pre = A[i - 1]
  tem = A[i]
  nex = A[i + 1]
  x = abs(pre - tem) + abs(tem - nex)
  sum += x
  D.append(abs(pre - nex) - x)
for d in D:
  print(sum + d)

Fixed submission:
from itertools import accumulate
N = int(input())
A = tuple([0,] + list(map(int, input().split())) + [0,])
D = []
sum = 0
for i, a in enumerate(A[1:-1]):
  i += 1
  pre = A[i - 1]
  tem = A[i]
  nex = A[i + 1]
  x = abs(pre - tem)
  y = abs(tem - nex)
  sum += x
  D.append(abs(pre - nex) - x - y)
sum += y
for d in D:
  print(sum + d)
Buggy python submission (verdict: Runtime Error):
A, B = map(int, input().split())
count = 0
for i in range(A, B + 1):
  a = str(i)
  b = a[::-1]
  count += 1 if a == b
print(count)

Fixed submission:
A, B = map(int, input().split())
count = 0
for i in range(A, B + 1):
  a = str(i)
  b = a[::-1]
  if a == b:
    count += 1 
print(count)
Buggy python submission (verdict: Runtime Error):
N = input()
A = input()
print("YES" if N / 500 <= A else "NO")

Fixed submission:
N = int(input())
A = int(input())
print("Yes" if N % 500 <= A else "No")
Buggy python submission (verdict: Runtime Error):
N = int(input())
A = [int(input()) for i in range(N)]
A.sorted()
print(sum(A[::-2]) - sum(A[-2::-2])

Fixed submission:
N = int(input())
A = list(map(int, input().split()))
A.sort()
print(sum(A[::-2]) - sum(A[-2::-2]))
Buggy python submission (verdict: Runtime Error):
s = input()
s[3] = 8
print(s)

Fixed submission:
s = input()
print(s[:3] + "8" + s[4:])
Buggy python submission (verdict: Runtime Error):
N, A, B = map(int, input().split())
count = 0
for i in range(1, N + 1):
  sum = 0
  number = str(i)
  for j in number:
    sum += int(j)
    count += 1 if A <= sum <= B
print(count)

Fixed submission:
N, A, B = map(int, input().split())
result = 0
for i in range(1, N + 1):
  sum = 0
  number = str(i)
  for j in number:
    sum += int(j)
  if A <= sum <= B:
    result += i
print(result)
Buggy python submission (verdict: Runtime Error):
N = int(input())
A = list(map(int, input().split()))
cnt = 0
for i, a in enumerate(A, 1):
  if a == i:
    if i != len(A) + 1:
      x = A[i - 1]
      y = A[i]
      A[i - 1] = y
      A[i] = x    
      cnt += 1
    else:
      x = A[i - 2]
      y = A[i - 1]
      A[i - 2] = y
      A[i - 1] = x    
      cnt += 1
print(cnt)

Fixed submission:
N = int(input())
A = list(map(int, input().split()))
cnt = 0
for i, a in enumerate(A, 1):
  if a == i:
    if i != len(A):
      x = A[i - 1]
      y = A[i]
      A[i - 1] = y
      A[i] = x    
      cnt += 1
    else:
      x = A[i - 2]
      y = A[i - 1]
      A[i - 2] = y
      A[i - 1] = x    
      cnt += 1
print(cnt)

Buggy python submission (verdict: Runtime Error):
N = int(input())
A = list(map(int, input().split()))
cnt = 0
for i, a in enumerate(A, 1):
  if a == i:
    if i == len(A) + 1:
      x = a[i - 1]
      y = a[i]
      a[i - 1] = y
      a[i] = x    
      cnt += 1
    else:
      x = a[i - 2]
      y = a[i - 1]
      a[i - 2] = y
      a[i - 1] = x    
      cnt += 1
print(cnt)


Fixed submission:
N = int(input())
A = list(map(int, input().split()))
cnt = 0
for i, a in enumerate(A, 1):
  if a == i:
    if i != len(A):
      x = A[i - 1]
      y = A[i]
      A[i - 1] = y
      A[i] = x    
      cnt += 1
    else:
      x = A[i - 2]
      y = A[i - 1]
      A[i - 2] = y
      A[i - 1] = x    
      cnt += 1
print(cnt)

Buggy python submission (verdict: Runtime Error):
N = int(input())
A = list(map(int, input().split()))
cnt = 0
for i, a in enumerate(A, 1):
  if a == i:
    x = a[i - 1]
    y = a[i]
    a[i - 1] = y
    a[i] = x    
    cnt += 1
print(cnt)

Fixed submission:
N = int(input())
A = list(map(int, input().split()))
cnt = 0
for i, a in enumerate(A, 1):
  if a == i:
    if i != len(A):
      x = A[i - 1]
      y = A[i]
      A[i - 1] = y
      A[i] = x    
      cnt += 1
    else:
      x = A[i - 2]
      y = A[i - 1]
      A[i - 2] = y
      A[i - 1] = x    
      cnt += 1
print(cnt)
Buggy python submission (verdict: Runtime Error):
S = input()
S = sorted(set(S))
A = "abcdefghijklmnopqrstuvwxyz"
for i in range(len(A)):
  if len(A) == len(S):
    print("None")
    break
  if A[i] != S[i]:
    print(A[i])
    break
  if i == len(S):
    print(A[i + 1])
    break

Fixed submission:
S = input()
S = sorted(set(S))
A = "abcdefghijklmnopqrstuvwxyz"
for i in range(len(A)):
  if len(A) == len(S):
    print("None")
    break
  if A[i] != S[i]:
    print(A[i])
    break
  if i == len(S) - 1:
    print(A[i + 1])
    break

Buggy python submission (verdict: Runtime Error):
S = input()
S = sorted(set(S))
A = "abcdefghijklmnopqrstuvwxyz"
for i in range(len(A)):
  if len(A) == len(S):
    print("None")
    break
  if A[i] != S[i]:
    print(A[i])
    break

Fixed submission:
S = input()
S = sorted(set(S))
A = "abcdefghijklmnopqrstuvwxyz"
for i in range(len(A)):
  if len(A) == len(S):
    print("None")
    break
  if A[i] != S[i]:
    print(A[i])
    break
  if i == len(S) - 1:
    print(A[i + 1])
    break
Buggy python submission (verdict: Runtime Error):
N, M = map(int, input())
From = set()
To = set()
for _ in range(M):
  a, b = map(int, input())
  if a == 1:
    From.add(b)
  if b == N:
    To.add(a)
if From.isdisjoint(To):
  print("INPOSSIBLE")
else:
  print("POOSIBLE")

Fixed submission:
N, M = map(int, input().split())
From = set()
To = set()
for _ in range(M):
  a, b = map(int, input().split())
  if a == 1:
    From.add(b)
  if b == N:
    To.add(a)
if From.isdisjoint(To):
  print("IMPOSSIBLE")
else:
  print("POSSIBLE")
Buggy python submission (verdict: Runtime Error):
N, M = map(int, input().split())
A = []
for i in range(M):
  A += list(map(int, input().split()))
B = [0 for in range(N)]
for a in A:
  B[a - 1] += 1
for b in B:
  print(b)

Fixed submission:
N, M = map(int, input().split())
A = []
for i in range(M):
  A += list(map(int, input().split()))
B = [0 for i in range(N)]
for a in A:
  B[a - 1] += 1
for b in B:
  print(b)
Buggy python submission (verdict: Runtime Error):
N = int(input())
A = list(map(int, input().split()))
A.sort()
print(sum(A[N + 1:2N + 1])

Fixed submission:
N = int(input())
A = list(map(int, input().split()))
A.sort(reverse=True)
print(sum(A[1:2 * N:2]))