2025-08-18 20:18:16 +0300 MSK

class Solution:
    def checkXMatrix(self, grid: List[List[int]]) -> bool:
        length = len(grid)
        for row in range(length):
            for col in range(length):
                is_diag = row == col or length - row - 1 == col
                val = grid[row][col]
                if (is_diag and val == 0) or (not is_diag and val != 0):
                    return False
        return True