2025-08-01 10:12:38 +0000 UTC

class Solution:
    def projectionArea(self, grid: list[list[int]]) -> int:
        res = 0
        length = len(grid)

        for i in range(length):
            best_row = 0
            best_col = 0 
            for j in range(length):
                if grid[i][j]: 
                    res += 1 
                best_row = max(best_row, grid[i][j])
                best_col = max(best_col, grid[j][i])

            res += best_row + best_col

        return res