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算法题（国外版）/binary-tree-inorder-traversal.html Normal file
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<p>Given the <code>root</code> of a binary tree, return <em>the inorder traversal of its nodes&#39; values</em>.</p>
<p>&nbsp;</p>
<p><strong>Example 1:</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2020/09/15/inorder_1.jpg" style="width: 125px; height: 200px;" />
<pre>
<strong>Input:</strong> root = [1,null,2,3]
<strong>Output:</strong> [1,3,2]
</pre>
<p><strong>Example 2:</strong></p>
<pre>
<strong>Input:</strong> root = []
<strong>Output:</strong> []
</pre>
<p><strong>Example 3:</strong></p>
<pre>
<strong>Input:</strong> root = [1]
<strong>Output:</strong> [1]
</pre>
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>
<ul>
<li>The number of nodes in the tree is in the range <code>[0, 100]</code>.</li>
<li><code>-100 &lt;= Node.val &lt;= 100</code></li>
</ul>
<p>&nbsp;</p>
<strong>Follow up:</strong> Recursive solution is trivial, could you do it iteratively?