Buggy python submission (verdict: Time Limit Exceeded):
from collections import deque

N, A, B, C, D = map(int, input().split(' '))
S = input()
blocks = [i+1 for i, s in enumerate([s for s in S]) if s == '#']
flag = False
check_set = set()

que = deque([(A, B)])
while que:
    A, B = que.pop()
    check_set.add((A, B))
    if A == C and B == D:
        flag = True
        break
    for i in range(3):
        for j in range(3):
            if i == j == 0:
                continue
            if A+i <= C and B+j <= D and A+i != B+j and (A+i) not in blocks and (B+j) not in blocks:
                if (A+i, B+j) not in check_set:
                    que.append((A+i, B+j))

if flag:
    print('Yes')
else:
    print('No')

Fixed submission:
N, A, B, C, D = map(int, input().split(' '))
S = input()
blocks = [i+1 for i, s in enumerate([s for s in S]) if s == '#']

if '##' in S[A-1:C] or '##' in S[B-1:D]:
    print('No')
elif C < D:
    if S[C-1] == '.' and S[D-1] == '.':
        print('Yes')
    else:
        print('No')
else:
    if '...' in S[max(0, B - 2):D+1]:
        print('Yes')
    else:
        print('No')

Buggy python submission (verdict: Runtime Error):
from collections import deque

N, A, B, C, D = map(int, input().split(' '))
S = input()
blocks = [i+1 for i, s in enumerate([s for s in S]) if s == '#']
flag = False
check_set = set()

que = deque([(A, B)])
while que:
    A, B = que.pop()
    check_list.add((A, B))
    if A == C and B == D:
        flag = True
        break
    for i in range(3):
        for j in range(3):
            if i == j == 0:
                continue
            if A+i <= C and B+j <= D and A+i != B+j and (A+i) not in blocks and (B+j) not in blocks:
                if (A+i, B+j) not in check_set:
                    que.append((A+i, B+j))

if flag:
    print('Yes')
else:
    print('No')

Fixed submission:
N, A, B, C, D = map(int, input().split(' '))
S = input()
blocks = [i+1 for i, s in enumerate([s for s in S]) if s == '#']

if '##' in S[A-1:C] or '##' in S[B-1:D]:
    print('No')
elif C < D:
    if S[C-1] == '.' and S[D-1] == '.':
        print('Yes')
    else:
        print('No')
else:
    if '...' in S[max(0, B - 2):D+1]:
        print('Yes')
    else:
        print('No')

Buggy python submission (verdict: Time Limit Exceeded):
from collections import deque

N, A, B, C, D = map(int, input().split(' '))
S = input()
blocks = [i+1 for i, s in enumerate([s for s in S]) if s == '#']
flag = False

que = deque([(A, B)])
while que:
    A, B = que.pop()
    if A == C and B == D:
        flag = True
        break
    for i in range(3):
        for j in range(3):
            if i == j == 0:
                continue
            if A+i <= C and B+j <= D and A+i != B+j and (A+i) not in blocks and (B+j) not in blocks:
                que.append((A+i, B+j))

if flag:
    print('Yes')
else:
    print('No')

Fixed submission:
N, A, B, C, D = map(int, input().split(' '))
S = input()
blocks = [i+1 for i, s in enumerate([s for s in S]) if s == '#']

if '##' in S[A-1:C] or '##' in S[B-1:D]:
    print('No')
elif C < D:
    if S[C-1] == '.' and S[D-1] == '.':
        print('Yes')
    else:
        print('No')
else:
    if '...' in S[max(0, B - 2):D+1]:
        print('Yes')
    else:
        print('No')