leetcode-problemset/leetcode-cn/problem (Chinese)/三维形体的表面积 [surface-area-of-3d-shapes].html

<p>给你一个 <code>n * n</code> 的网格&nbsp;<code>grid</code> ，上面放置着一些&nbsp;<code>1 x 1 x 1</code>&nbsp;的正方体。每个值&nbsp;<code>v = grid[i][j]</code>&nbsp;表示&nbsp;<code>v</code>&nbsp;个正方体叠放在对应单元格&nbsp;<code>(i, j)</code>&nbsp;上。</p>

<p>放置好正方体后，任何直接相邻的正方体都会互相粘在一起，形成一些不规则的三维形体。</p>

<p>请你返回最终这些形体的总表面积。</p>

<p><strong>注意：</strong>每个形体的底面也需要计入表面积中。</p>

<p>&nbsp;</p>

<ul>
</ul>

<p><strong>示例 1：</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2021/01/08/tmp-grid2.jpg" style="height: 80px; width: 80px;" />
<pre>
<strong>输入：</strong>grid = [[1,2],[3,4]]
<strong>输出：</strong>34
</pre>

<p><strong>示例 2：</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2021/01/08/tmp-grid4.jpg" style="height: 100px; width: 100px;" />
<pre>
<strong>输入：</strong>grid = [[1,1,1],[1,0,1],[1,1,1]]
<strong>输出：</strong>32
</pre>

<p><strong>示例 3：</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2021/01/08/tmp-grid5.jpg" style="height: 100px; width: 100px;" />
<pre>
<strong>输入：</strong>grid = [[2,2,2],[2,1,2],[2,2,2]]
<strong>输出：</strong>46
</pre>

<p>&nbsp;</p>

<p><strong>提示：</strong></p>

<ul>
	<li><code>n == grid.length</code></li>
	<li><code>n == grid[i].length</code></li>
	<li><code>1 &lt;= n &lt;= 50</code></li>
	<li><code>0 &lt;= grid[i][j] &lt;= 50</code></li>
</ul>