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leetcode-problemset/leetcode-cn/problem (Chinese)/二叉树的最小深度 [minimum-depth-of-binary-tree].html

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2022-03-27 20:56:26 +08:00
<p>给定一个二叉树,找出其最小深度。</p>
<p>最小深度是从根节点到最近叶子节点的最短路径上的节点数量。</p>
<p><strong>说明:</strong>叶子节点是指没有子节点的节点。</p>
<p> </p>
<p><strong>示例 1</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2020/10/12/ex_depth.jpg" style="width: 432px; height: 302px;" />
<pre>
<strong>输入:</strong>root = [3,9,20,null,null,15,7]
<strong>输出:</strong>2
</pre>
<p><strong>示例 2</strong></p>
<pre>
<strong>输入:</strong>root = [2,null,3,null,4,null,5,null,6]
<strong>输出:</strong>5
</pre>
<p> </p>
<p><strong>提示:</strong></p>
<ul>
<li>树中节点数的范围在 <code>[0, 10<sup>5</sup>]</code></li>
<li><code>-1000 <= Node.val <= 1000</code></li>
</ul>