problem0892

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892. Surface Area of 3D Shapes

题目

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

解题思路

见程序注释