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


H, W = map(int, input().split())
Ch, Cw = map(lambda x: int(x) - 1, input().split())
Dh, Dw = map(lambda x: int(x) - 1, input().split())
maze = [input() for _ in range(H)]

INF = 10 ** 12
path = [[INF] * W for _ in range(H)]  # path: 各マスへの移動コスト

# walk:移動A, warp:移動B
walk = [(0, 1), (0, -1), (-1, 0), (1, 0)]
warp = [(i, j) for i in range(-2, 3) for j in range(-2, 3) if (i, j) not in [(0, 0)] + walk]

q = deque()
path[Ch][Cw] = 0
q.append((Ch, Cw, 0))

while q:
    x, y, s = q.popleft()
    for dx, dy in walk:  # 移動A
        nx = x + dx
        ny = y + dy
        if 0 <= nx < H and 0 <= ny < W and maze[nx][ny] == '.' and path[nx][ny] > s:
            path[nx][ny] = s
            q.appendleft((nx, ny, s))  # 移動Aの場合はコスト0. キューの先頭に追加する.
    for dx, dy in warp:  # 移動B
        nx = x + dx
        ny = y + dy
        if 0 <= nx < H and 0 <= ny < W and maze[nx][ny] == '.' and path[nx][ny] > s + 1:
            path[nx][ny] = s + 1
            q.append((nx, ny, s + 1))  # 移動Bの場合はコスト1. キューの最後尾に追加する.
    
ans = path[Dh][Dw] if path[Dh][Dw] < INF else '-1'
print(ans)

Fixed submission:
from collections import deque


H, W = map(int, input().split())
Ch, Cw = map(lambda x: int(x) - 1, input().split())
Dh, Dw = map(lambda x: int(x) - 1, input().split())
maze = [input() for _ in range(H)]

INF = 10 ** 12
path = [[INF] * W for _ in range(H)]  # path: 各マスへの移動コスト

# walk:移動A, warp:移動B
walk = [(0, 1), (0, -1), (-1, 0), (1, 0)]
warp = [(i, j) for i in range(-2, 3) for j in range(-2, 3) if (i, j) not in [(0, 0)] + walk]

q = deque()
path[Ch][Cw] = 0
q.append((Ch, Cw, 0))

while q:
    x, y, s = q.popleft()
    for dx, dy in walk:  # 移動A
        nx = x + dx
        ny = y + dy
        if 0 <= nx < H and 0 <= ny < W and maze[nx][ny] == '.' and path[nx][ny] > s:
            path[nx][ny] = s
            q.appendleft((nx, ny, s))  # 移動Aの場合はコスト0. キューの先頭に追加する.
    for dx, dy in warp:  # 移動B
        nx = x + dx
        ny = y + dy
        if 0 <= nx < H and 0 <= ny < W and maze[nx][ny] == '.' and path[nx][ny] > s + 1:
            path[nx][ny] = s + 1
            q.append((nx, ny, s + 1))  # 移動Bの場合はコスト1. キューの最後尾に追加する.
    
ans = path[Dh][Dw] if path[Dh][Dw] < INF else '-1'
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
#template
def inputlist(): return [int(j) for j in input().split()]
#template

H,W = inputlist()
st = inputlist()
gl = inputlist()
maze = ['0']*H
for i in range(H):
    maze[i] = list(input())
table = [[10**9+7]*W for _ in range(H)]

from collections import deque
dx = [0,1,0,-1]
dy = [1,0,-1,0]

que = deque()
table[st[0]-1][st[1]-1] = 0
que.append((st[0]-1,st[1]-1,0))

while len(que) != 0:
    x,y,c = que.popleft()
    for i in range(4):
        nx = x+dx[i]
        ny = y+dy[i]

        if 0 <= nx < H and 0 <= ny < W and maze[nx][ny] == "." and table[nx][ny] > c:
            table[nx][ny] = c
            que.append((nx,ny,c))

    for i in range(-2,3):
        for j in range(-2,3):
            if (i,j) == (0,1) or (i,j) == (1,0) or (i,j) == (0,-1) or (i,j) == (-1,0):
                continue
            nxa = x+i
            nya = y+j

            if 0 <= nxa < H and 0 <= nya < W and maze[nxa][nya] == "." and table[nxa][nya] > c+1:
                table[nxa][nya] = c+1
                que.append((nxa,nya,c+1))

if table[gl[0]-1][gl[1]-1] == 10**9+7:
    print(-1)
else:
    print(table[gl[0]-1][gl[1]-1])

Fixed submission:
from collections import deque


H, W = map(int, input().split())
Ch, Cw = map(lambda x: int(x) - 1, input().split())
Dh, Dw = map(lambda x: int(x) - 1, input().split())
maze = [input() for _ in range(H)]

INF = 10 ** 12
path = [[INF] * W for _ in range(H)]  # path: 各マスへの移動コスト

# walk:移動A, warp:移動B
walk = [(0, 1), (0, -1), (-1, 0), (1, 0)]
warp = [(i, j) for i in range(-2, 3) for j in range(-2, 3) if (i, j) not in [(0, 0)] + walk]

q = deque()
path[Ch][Cw] = 0
q.append((Ch, Cw, 0))

while q:
    x, y, s = q.popleft()
    for dx, dy in walk:  # 移動A
        nx = x + dx
        ny = y + dy
        if 0 <= nx < H and 0 <= ny < W and maze[nx][ny] == '.' and path[nx][ny] > s:
            path[nx][ny] = s
            q.appendleft((nx, ny, s))  # 移動Aの場合はコスト0. キューの先頭に追加する.
    for dx, dy in warp:  # 移動B
        nx = x + dx
        ny = y + dy
        if 0 <= nx < H and 0 <= ny < W and maze[nx][ny] == '.' and path[nx][ny] > s + 1:
            path[nx][ny] = s + 1
            q.append((nx, ny, s + 1))  # 移動Bの場合はコスト1. キューの最後尾に追加する.
    
ans = path[Dh][Dw] if path[Dh][Dw] < INF else '-1'
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
#template
def inputlist(): return [int(j) for j in input().split()]
#template

H,W = inputlist()
st = inputlist()
gl = inputlist()
maze = ['0']*H
for i in range(H):
    maze[i] = list(input())
table = [[10**9+7]*W for _ in range(H)]

from collections import deque
dx = [0,1,0,-1]
dy = [1,0,-1,0]

que = deque()
table[st[0]-1][st[1]-1] = 0
que.append((st[0]-1,st[1]-1,0))

while len(que) != 0:
    x,y,c = que.popleft()
    for i in range(4):
        nx = x+dx[i]
        ny = y+dy[i]

        if 0 <= nx < H and 0 <= ny < W and maze[nx][ny] == "." and table[nx][ny] > c:
            table[nx][ny] = c
            que.append((nx,ny,c))

    for i in range(-2,3):
        for j in range(-2,3):
            if (i,j) == (0,1) or (i,j) == (1,0) or (i,j) == (0,-1) or (i,j) == (-1,0):
                continue
            nxa = x+i
            nya = y+j

            if 0 <= nxa < H and 0 <= nya < W and maze[nxa][nya] == "." and table[nxa][nya] > c+1:
                table[nxa][nya] = c+1
                que.append((nxa,nya,c+1))

if table[gl[0]-1][gl[1]-1] == 10**9+7:
    print(-1)
else:
    print(table[gl[0]-1][gl[1]-1])

Fixed submission:
from collections import deque


H, W = map(int, input().split())
Ch, Cw = map(lambda x: int(x) - 1, input().split())
Dh, Dw = map(lambda x: int(x) - 1, input().split())
maze = [input() for _ in range(H)]

INF = 10 ** 12
path = [[INF] * W for _ in range(H)]  # path: 各マスへの移動コスト

# walk:移動A, warp:移動B
walk = [(0, 1), (0, -1), (-1, 0), (1, 0)]
warp = [(i, j) for i in range(-2, 3) for j in range(-2, 3) if (i, j) not in [(0, 0)] + walk]

q = deque()
path[Ch][Cw] = 0
q.append((Ch, Cw, 0))

while q:
    x, y, s = q.popleft()
    for dx, dy in walk:  # 移動A
        nx = x + dx
        ny = y + dy
        if 0 <= nx < H and 0 <= ny < W and maze[nx][ny] == '.' and path[nx][ny] > s:
            path[nx][ny] = s
            q.appendleft((nx, ny, s))  # 移動Aの場合はコスト0. キューの先頭に追加する.
    for dx, dy in warp:  # 移動B
        nx = x + dx
        ny = y + dy
        if 0 <= nx < H and 0 <= ny < W and maze[nx][ny] == '.' and path[nx][ny] > s + 1:
            path[nx][ny] = s + 1
            q.append((nx, ny, s + 1))  # 移動Bの場合はコスト1. キューの最後尾に追加する.
    
ans = path[Dh][Dw] if path[Dh][Dw] < INF else '-1'
print(ans)