0883. Projection Area of 3D Shapes #

class Solution {
    public int projectionArea(int[][] grid) {
        int area = 0;
        for (int i = 0; i < grid.length; i++) {
            for (int j = 0; j < grid[0].length; j++) {
                if (grid[i][j] != 0) area++;
            }
        }
        for (int i = 0; i < grid.length; i++) {
            int maximum = 0;
            for (int j = 0; j < grid[0].length; j++) {
                maximum = Math.max(maximum, grid[i][j]);
            }
            area += maximum;
        }
        for (int j = 0; j < grid[0].length; j++) {
            int maximum = 0;
            for (int i = 0; i < grid.length; i++) {
                maximum = Math.max(maximum, grid[i][j]);
            }
            area += maximum;
        }
        return area;
    }
}