### allCellsDistOrder 
from collections import deque
from typing import *
def f_gold(rows: int, cols: int, rCenter: int, cCenter: int
) -> List[List[int]]:
    q = deque([(rCenter, cCenter)])
    vis = [[False] * cols for _ in range(rows)]
    vis[rCenter][cCenter] = True
    ans = []
    while q:
        for _ in range(len(q)):
            i, j = q.popleft()
            ans.append([i, j])
            for a, b in [[1, 0], [-1, 0], [0, 1], [0, -1]]:
                x, y = i + a, j + b
                if 0 <= x < rows and 0 <= y < cols and not vis[x][y]:
                    q.append((x, y))
                    vis[x][y] = True
    return ans