Problem: You will be given a string S of length 3 representing the weather forecast for three days in the past.  The i-th character (1 \leq i \leq 3) of S represents the forecast for the i-th day. `S`, `C`, and `R` stand for sunny, cloudy, and rainy, respectively.  You will also be given a string T of length 3 representing the actual weather on those three days.  The i-th character (1 \leq i \leq 3) of S represents the actual weather on the i-th day. `S`, `C`, and `R` stand for sunny, cloudy, and rainy, respectively.  Print the number of days for which the forecast was correct.

Submission attempts (in order):
import sys
from collections import deque
input = sys.stdin.readline

n = int(input())
a = [deque([x for x in list(map(int, input().split()))]) for _ in range(n)]

f = True
day = 1
while(f):
  if day > 10000:
    print(-1)
    sys.exit()
  done = set()
  nokori_games = 0
  
  for m in range(n):
    la = len(a[m])
    nokori_games += la
    if m in done:
      pass
    elif la:
      teki = a[m][0]
      jibun = m + 1
      if a[teki - 1][0] == jibun and teki - 1 not in done:
        a[m].popleft()
        a[teki - 1].popleft()
        done.add(m)
        done.add(teki - 1)
        nokori_games -= 1
      elif not len(a[teki - 1]):
        print(-1)
        sys.exit()
  if nokori_games:
    if not len(done):
      print(-1)
      sys.exit()
  else:
    print(day)
    sys.exit()
  day += 1


import sys
from collections import deque
input = sys.stdin.readline

n = int(input())
a = [deque([x for x in list(map(int, input().split()))]) for _ in range(n)]

f = True
day = 1
while(f):
  if day > 10000:
    print(-1)
    sys.exit()
  done = set()
  nokori_games = 0
  
  for m in range(n):
    la = len(a[m])
    nokori_games += la
    if m in done:
      pass
    elif la:
      teki = a[m][0]
      jibun = m + 1
      if a[teki - 1][0] == jibun and teki - 1 not in done:
        a[m].popleft()
        a[teki - 1].popleft()
        done.add(m)
        done.add(teki - 1)
        nokori_games -= 1
      elif not len(a[teki - 1]):
        print(-1)
        sys.exit()
  if nokori_games:
    if not len(done):
      print(-1)
      sys.exit()
  else:
    print(day)
    sys.exit()
  day += 1


import sys
from collections import deque
input = sys.stdin.readline

n = int(input())
a = [deque([x for x in list(map(int, input().split()))]) for _ in range(n)]

f = True
day = 1
while(f):
  if day > 2500:
    print(-1)
    sys.exit()
  done = set()
  nokori_games = 0
  
  for m in range(n):
    la = len(a[m])
    nokori_games += la
    if m in done:
      pass
    elif la:
      teki = a[m][0]
      jibun = m + 1
      if a[teki - 1][0] == jibun and teki - 1 not in done:
        a[m].popleft()
        a[teki - 1].popleft()
        done.add(m)
        done.add(teki - 1)
        nokori_games -= 1
      elif not len(a[teki - 1]):
        print(-1)
        sys.exit()
  if nokori_games:
    if not len(done):
      print(-1)
      sys.exit()
  else:
    print(day)
    sys.exit()
  day += 1


import sys
from collections import deque
input = sys.stdin.readline

n = int(input())
a = [deque([x for x in list(map(int, input().split()))]) for _ in range(n)]

f = True
day = 1
while(f):
  if day > 10000:
    print(-1)
    sys.exit()
  done = set()
  nokori_games = 0
  
  for m in range(n):
    la = len(a[m])
    nokori_games += la
    if m in done:
      pass
    elif la:
      teki = a[m][0]
      jibun = m + 1
      if a[teki - 1][0] == jibun and teki - 1 not in done:
        a[m].popleft()
        a[teki - 1].popleft()
        done.add(m)
        done.add(teki - 1)
        nokori_games -= 1
      elif not len(a[teki - 1]):
        print(-1)
        sys.exit()
  if nokori_games:
    if not len(done):
      print(-1)
      sys.exit()
  else:
    print(day)
    sys.exit()
  day += 1


p = input()
r = input()

c = 0
for i in range(3):
  if p[i] == r[i]:
    c += 1

print(c)

Verdicts: Runtime Error

Runtime Error

Runtime Error

Runtime Error

Accepted