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add leetcode problem-cn part6

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2022-03-27 20:56:26 +08:00
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算法题（国内版）/problem (Chinese)/二叉树的中序遍历 [binary-tree-inorder-traversal].html Normal file
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<p>给定一个二叉树的根节点 <code>root</code> ，返回 <em>它的 <strong>中序</strong>&nbsp;遍历</em> 。</p>
<p>&nbsp;</p>
<p><strong>示例 1：</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2020/09/15/inorder_1.jpg" style="height: 200px; width: 125px;" />
<pre>
<strong>输入：</strong>root = [1,null,2,3]
<strong>输出：</strong>[1,3,2]
</pre>
<p><strong>示例 2：</strong></p>
<pre>
<strong>输入：</strong>root = []
<strong>输出：</strong>[]
</pre>
<p><strong>示例 3：</strong></p>
<pre>
<strong>输入：</strong>root = [1]
<strong>输出：</strong>[1]
</pre>
<p>&nbsp;</p>
<p><strong>提示：</strong></p>
<ul>
<li>树中节点数目在范围 <code>[0, 100]</code> 内</li>
<li><code>-100 &lt;= Node.val &lt;= 100</code></li>
</ul>
<p>&nbsp;</p>
<p><strong>进阶:</strong>&nbsp;递归算法很简单，你可以通过迭代算法完成吗？</p>