On a N*N grid, we place some 1 * 1 * 1 cubes.
Each value v = grid[i][j] represents a tower ofvcubes placed on top of grid cell(i, j).
Return the total surface area of the resulting shapes.
Example 1:
Input: [[2]]
Output: 10
Example 2:
Input: [[1,2],[3,4]]
Output: 34
Example 3:
Input: [[1,0],[0,2]]
Output: 16
Example 4:
Input: [[1,1,1],[1,0,1],[1,1,1]]
Output: 32
Example 5:
Input: [[2,2,2],[2,1,2],[2,2,2]]
Output: 46
Note:
- 1 <= N <= 50
- 0 <= grid[i][j] <= 50
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