mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-01-10 18:48:13 +08:00
27 lines
872 B
HTML
27 lines
872 B
HTML
<p>Given the <code>root</code> of a binary tree, return <em>its maximum depth</em>.</p>
|
|
|
|
<p>A binary tree's <strong>maximum depth</strong> is the number of nodes along the longest path from the root node down to the farthest leaf node.</p>
|
|
|
|
<p> </p>
|
|
<p><strong class="example">Example 1:</strong></p>
|
|
<img alt="" src="https://assets.leetcode.com/uploads/2020/11/26/tmp-tree.jpg" style="width: 400px; height: 277px;" />
|
|
<pre>
|
|
<strong>Input:</strong> root = [3,9,20,null,null,15,7]
|
|
<strong>Output:</strong> 3
|
|
</pre>
|
|
|
|
<p><strong class="example">Example 2:</strong></p>
|
|
|
|
<pre>
|
|
<strong>Input:</strong> root = [1,null,2]
|
|
<strong>Output:</strong> 2
|
|
</pre>
|
|
|
|
<p> </p>
|
|
<p><strong>Constraints:</strong></p>
|
|
|
|
<ul>
|
|
<li>The number of nodes in the tree is in the range <code>[0, 10<sup>4</sup>]</code>.</li>
|
|
<li><code>-100 <= Node.val <= 100</code></li>
|
|
</ul>
|