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leetcode/problem/maximum-depth-of-binary-tree.html Normal file
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<p>Given the <code>root</code> of a binary tree, return <em>its maximum depth</em>.</p>
<p>A binary tree&#39;s <strong>maximum depth</strong>&nbsp;is the number of nodes along the longest path from the root node down to the farthest leaf node.</p>
<p>&nbsp;</p>
<p><strong>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>Example 2:</strong></p>
<pre>
<strong>Input:</strong> root = [1,null,2]
<strong>Output:</strong> 2
</pre>
<p>&nbsp;</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 &lt;= Node.val &lt;= 100</code></li>
</ul>