Watch 10 video solutions for Surface Area of 3D Shapes, a easy level problem involving Array, Math, Geometry. This walkthrough by Mario's Math Tutoring has 262,625 views views. Want to try solving it yourself? Practice on FleetCode or read the detailed text solution.
You are given an n x n grid where you have placed some 1 x 1 x 1 cubes. Each value v = grid[i][j] represents a tower of v cubes placed on top of cell (i, j).
After placing these cubes, you have decided to glue any directly adjacent cubes to each other, forming several irregular 3D shapes.
Return the total surface area of the resulting shapes.
Note: The bottom face of each shape counts toward its surface area.
Example 1:
Input: grid = [[1,2],[3,4]] Output: 34
Example 2:
Input: grid = [[1,1,1],[1,0,1],[1,1,1]] Output: 32
Example 3:
Input: grid = [[2,2,2],[2,1,2],[2,2,2]] Output: 46
Constraints:
n == grid.length == grid[i].length1 <= n <= 500 <= grid[i][j] <= 50