Buggy python submission (verdict: Time Limit Exceeded):
import fractions
import sys
from functools import reduce
import math

input = sys.stdin.readline


def main():
    n, q = input_list()
    s = input()
    for _ in range(q):
        l, r = input_list()
        ss = s[l-1:r]
        print(ss.count('AC'))


def get_camulative(l):
    import itertools
    # 累積和
    return [0] + list(itertools.accumulate(l))

def combinations_count(n, r):
    return math.factorial(n) // (math.factorial(n - r) * math.factorial(r))


def input_list():
    return list(map(int, input().split()))


def input_list_str():
    return list(map(str, input().split()))


def lcm_base(x, y):
    return (x * y) // fractions.gcd(x, y)


def lcm_list(numbers):
    return reduce(lcm_base, numbers, 1)


def gcd(*numbers):
    return reduce(fractions.gcd, numbers)


def gcd_list(numbers):
    return reduce(fractions.gcd, numbers)


if __name__ == "__main__":
    main()


Fixed submission:
N, Q = map(int, input().split())
S = input()
tmp = [0] * (N+1)

for i in range(N):
  w = 1 if S[i:i+2] == 'AC' else 0
  tmp[i+1] = tmp[i] + w
  
for _ in range(Q):
  l, r = map(int, input().split())
  print(tmp[r-1] - tmp[l-1])

Buggy python submission (verdict: Runtime Error):
def count_section_by_zero(data):
  count = 0
  flg = False
  start = 0
  for i, d in enumerate(data):
    if flg is False and d != 0:
      count += 1
      flg = True
      
    if d == 0:
      flg = False
  return count

def input_list():
  return list(map(int, input().split()))

def input_list_str():
  return list(map(str, input().split()))

def lcm_base(x, y):
    return (x * y) // fractions.gcd(x, y)

def lcm_list(numbers):
    return reduce(lcm_base, numbers, 1)

def gcd(*numbers):
    return reduce(fractions.gcd, numbers)

def gcd_list(numbers):
    return reduce(fractions.gcd, numbers)

def combinations_count(n, r):
    return math.factorial(n) // (math.factorial(n - r) * math.factorial(r))

# 2で割り切れる回数
def divide_two(arg):
  c = 0
  while True:
    if c >= 2:
      break
    if arg % 2 != 0:
      break
    arg //= 2
    c += 1
  return c

# 素因数分解
def prime_factorize(n):
    a = []
    while n % 2 == 0:
        a.append(2)
        n //= 2
    f = 3
    while f * f <= n:
        if n % f == 0:
            a.append(f)
            n //= f
        else:
            f += 2
    if n != 1:
        a.append(n)
    return a

def main():
  n, q = input_list()
  s = input()
  ss = list(s)
  ac_count = s.count('AC')
  index = 1
  for i in range(n):
    if s[i]=='A' and s[i+1]=='C':
      ss[i] = 1
    else:
      ss[i] = 0
  for qi in range(q):
    l, r = input_list()
    x = ss[l-1:r-1]
    print(x.count(1))
  
import math
import fractions
import collections
import itertools
from functools import reduce
main()

Fixed submission:
N, Q = map(int, input().split())
S = input()
tmp = [0] * (N+1)

for i in range(N):
  w = 1 if S[i:i+2] == 'AC' else 0
  tmp[i+1] = tmp[i] + w
  
for _ in range(Q):
  l, r = map(int, input().split())
  print(tmp[r-1] - tmp[l-1])

Buggy python submission (verdict: Runtime Error):
def count_section_by_zero(data):
  count = 0
  flg = False
  start = 0
  for i, d in enumerate(data):
    if flg is False and d != 0:
      count += 1
      flg = True
      
    if d == 0:
      flg = False
  return count

def input_list():
  return list(map(int, input().split()))

def input_list_str():
  return list(map(str, input().split()))

def lcm_base(x, y):
    return (x * y) // fractions.gcd(x, y)

def lcm_list(numbers):
    return reduce(lcm_base, numbers, 1)

def gcd(*numbers):
    return reduce(fractions.gcd, numbers)

def gcd_list(numbers):
    return reduce(fractions.gcd, numbers)

def combinations_count(n, r):
    return math.factorial(n) // (math.factorial(n - r) * math.factorial(r))

# 2で割り切れる回数
def divide_two(arg):
  c = 0
  while True:
    if c >= 2:
      break
    if arg % 2 != 0:
      break
    arg //= 2
    c += 1
  return c

# 素因数分解
def prime_factorize(n):
    a = []
    while n % 2 == 0:
        a.append(2)
        n //= 2
    f = 3
    while f * f <= n:
        if n % f == 0:
            a.append(f)
            n //= f
        else:
            f += 2
    if n != 1:
        a.append(n)
    return a

def main():
  n, q = input_list()
  s = input()
  ss = list(s)
  ac_count = s.count('AC')
  index = 1
  for i in range(n):
    if s[i]=='A' and s[i+1]=='C':
      ss[i] = str(index)
      ss[i+1] = str(index)
      index += 1
  for qi in range(q):
    l, r = input_list()
    x = ss[l-1:r]
    ans = 0
    for i in range(1, index+1):
      if x.count(str(i)) == 2:
        ans += 1
    print(ans)
  
import math
import fractions
import collections
import itertools
from functools import reduce
main()

Fixed submission:
N, Q = map(int, input().split())
S = input()
tmp = [0] * (N+1)

for i in range(N):
  w = 1 if S[i:i+2] == 'AC' else 0
  tmp[i+1] = tmp[i] + w
  
for _ in range(Q):
  l, r = map(int, input().split())
  print(tmp[r-1] - tmp[l-1])

Buggy python submission (verdict: Time Limit Exceeded):
N, Q = map(int, input().split())
S = input()

import re

for _ in range(Q):
  l, r = map(int, input().split())
  r = re.findall('AC', S[l-1:r])
  print(len(r))
  
  

Fixed submission:
N, Q = map(int, input().split())
S = input()
tmp = [0] * (N+1)

for i in range(N):
  w = 1 if S[i:i+2] == 'AC' else 0
  tmp[i+1] = tmp[i] + w
  
for _ in range(Q):
  l, r = map(int, input().split())
  print(tmp[r-1] - tmp[l-1])