Runtime 2 ms Beats 81.30% Memory 41.9 MB Beats 88.62%

#N883. Projection Area of 3D Shapes
problem link
#solution

class Solution {
    public int projectionArea(int[][] grid) {
        int xy=0, yz=0, zx=0, max=0;

        for(int i=0; i<grid.length; i++){
            for(int j=0; j<grid[0].length; j++){
                if(grid[i][j]!=0) xy++;
                max=Math.max(max, grid[i][j]);
            }
            zx+=max;
            max=0;
        }
        for(int i=0; i<grid[0].length; i++){
            for(int j=0; j<grid.length; j++)
                max=Math.max(max, grid[j][i]);
            yz+=max;
            max=0;
        }

        return xy+yz+zx;
    }
}