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"translatedContent": "<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>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/09/15/inorder_1.jpg\" style=\"height: 200px; width: 125px;\" />\n<pre>\n<strong>输入:</strong>root = [1,null,2,3]\n<strong>输出:</strong>[1,3,2]\n</pre>\n\n<p><strong>示例 2</strong></p>\n\n<pre>\n<strong>输入:</strong>root = []\n<strong>输出:</strong>[]\n</pre>\n\n<p><strong>示例 3</strong></p>\n\n<pre>\n<strong>输入:</strong>root = [1]\n<strong>输出:</strong>[1]\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li>树中节点数目在范围 <code>[0, 100]</code> 内</li>\n\t<li><code>-100 &lt;= Node.val &lt;= 100</code></li>\n</ul>\n\n<p>&nbsp;</p>\n\n<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>\n",
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