[LeetCode] 883. Projection Area of 3D Shapes 三维物体的投影面积

Posted grandyang

tags:

篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了[LeetCode] 883. Projection Area of 3D Shapes 三维物体的投影面积相关的知识,希望对你有一定的参考价值。



On a?N?*?N?grid, we place some?1 * 1 * 1?cubes that are axis-aligned with the x, y, and z axes.

Each value?v = grid[i][j]?represents a tower of?v?cubes placed on top of grid cell?(i, j).

Now we view the?projection?of these cubes?onto the xy, yz, and zx planes.

A projection is like a shadow, that?maps our 3 dimensional figure to a 2 dimensional plane.?

Here, we are viewing the "shadow" when looking at the cubes from the top, the front, and the side.

Return the total area of all three projections.

Example 1:

Input: [[2]]
Output: 5

Example 2:

Input: [[1,2],[3,4]]
Output: 17
Explanation:
Here are the three projections ("shadows") of the shape made with each axis-aligned plane.
![](https://s3-lc-upload.s3.amazonaws.com/uploads/2018/08/02/shadow.png)

Example 3:

Input: [[1,0],[0,2]]
Output: 8

Example 4:

Input: [[1,1,1],[1,0,1],[1,1,1]]
Output: 14

Example 5:

Input: [[2,2,2],[2,1,2],[2,2,2]]
Output: 21

Note:

  • 1 <= grid.length = grid[0].length?<= 50
  • 0 <= grid[i][j] <= 50



参考资料:

https://leetcode.com/problems/projection-area-of-3d-shapes/



LeetCode All in One 题目讲解汇总(持续更新中...)

以上是关于[LeetCode] 883. Projection Area of 3D Shapes 三维物体的投影面积的主要内容,如果未能解决你的问题,请参考以下文章

LeetCode 883 Projection Area of 3D Shapes 解题报告

[LeetCode] 883. Projection Area of 3D Shapes 三维物体的投影面积

LeetCode 868. 二进制间距 / 398. 随机数索引(水塘抽样) / 883. 三维形体投影面积

codeforces 883H - Palindromic Cut - [字符串处理]

CF883H

883. Projection Area of 3D Shapes