Hypyt

from collections import deque

n, m, q = map(int, input().split())
grid = [input() for _ in range(n)]

rows = [[] for _ in range(n)]
cols = [[] for _ in range(m)]

for y in range(n):
    for x in range(m):
        if grid[y][x] == '.':
            rows[y].append((y, x))
            cols[x].append((y, x))

def bfs(start, target):
    sy, sx = start
    ty, tx = target

    visited = [[False] * m for _ in range(n)]
    dq = deque([(sy, sx, 0)])
    visited[sy][sx] = True
    used_rows = [False] * n
    used_cols = [False] * m
    
    while dq:
        y, x, d = dq.popleft()
        if (y, x) == (ty, tx):
            return d

        # Expand all points in this row
        if not used_rows[y]:
            for ny, nx in rows[y]:
                if not visited[ny][nx]:
                    visited[ny][nx] = True
                    dq.append((ny, nx, d + 1))
            used_rows[y] = True

        # Expand all points in this column
        if not used_cols[x]:
            for ny, nx in cols[x]:
                if not visited[ny][nx]:
                    visited[ny][nx] = True
                    dq.append((ny, nx, d + 1))
            used_cols[x] = True


    return -1

answers = []
for _ in range(q):
    y1, x1, y2, x2 = map(int, input().split()) 

    if (y1 - 1, x1 - 1) == (y2 - 1, x2 - 1):
        answers.append(0)
    else:
        answers.append(bfs((y1 - 1, x1 - 1), (y2 - 1, x2 - 1)))

for x in answers:
    print(x)

Test 1 (public)

Group: 1, 2, 3, 4, 5

Verdict: ACCEPTED

Test 2

Group: 1, 2, 3, 4, 5

Verdict: ACCEPTED

Test 3

Group: 1, 2, 3, 4, 5

Verdict: ACCEPTED

Test 4

Group: 1, 2, 3, 4, 5

Verdict: ACCEPTED

Test 5

Group: 1, 2, 3, 4, 5

Verdict: ACCEPTED

Test 6

Group: 2, 5

Verdict: TIME LIMIT EXCEEDED

Test 7

Group: 2, 5

Verdict: TIME LIMIT EXCEEDED

Test 8

Group: 2, 5

Verdict: TIME LIMIT EXCEEDED

Test 9

Group: 3, 4, 5

Verdict: TIME LIMIT EXCEEDED

Test 10

Group: 3, 4, 5

Verdict: TIME LIMIT EXCEEDED

Test 11

Group: 3, 4, 5

Verdict: TIME LIMIT EXCEEDED

Test 12

Group: 4, 5

Verdict: TIME LIMIT EXCEEDED

Test 13

Group: 4, 5

Verdict: TIME LIMIT EXCEEDED

Test 14

Group: 4, 5

Verdict: TIME LIMIT EXCEEDED

Test 15

Group: 5

Verdict: TIME LIMIT EXCEEDED

Test 16

Group: 5

Verdict: TIME LIMIT EXCEEDED

Test 17

Group: 5

Verdict: TIME LIMIT EXCEEDED

Test 18

Group: 5

Verdict: TIME LIMIT EXCEEDED

Test 19

Group: 5

Verdict: TIME LIMIT EXCEEDED

Test 20

Group: 5

Verdict: TIME LIMIT EXCEEDED

Test 21

Group: 5

Verdict: TIME LIMIT EXCEEDED

Test 22

Group: 1, 2, 3, 4, 5

Verdict: ACCEPTED

Test 23

Group: 1, 2, 3, 4, 5

Verdict: ACCEPTED

Test 24

Group: 5

Verdict: TIME LIMIT EXCEEDED

Test 25

Group: 5

Verdict: TIME LIMIT EXCEEDED

Test 26

Group: 5

Verdict: TIME LIMIT EXCEEDED

Test 27

Group: 5

Verdict: ACCEPTED