2025-08-24 16:18:26 +0000 UTC

class Solution:
    def reverseSubmatrix(self, grid: List[List[int]], x: int, y: int, k: int) -> List[List[int]]:
        rows, cols = len(grid), len(grid[0])
        for col in range(y, y + k):
            for row_dlt in range(k // 2):
                row1 = x + row_dlt
                row2 = (x + k - 1) - row_dlt
                grid[row1][col], grid[row2][col] = grid[row2][col], grid[row1][col]
        return grid