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"translatedContent": "<p>给你一棵二叉树的根节点 <code>root</code> ,翻转这棵二叉树,并返回其根节点。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/03/14/invert1-tree.jpg\" style=\"height: 165px; width: 500px;\" /></p>\n\n<pre>\n<strong>输入:</strong>root = [4,2,7,1,3,6,9]\n<strong>输出:</strong>[4,7,2,9,6,3,1]\n</pre>\n\n<p><strong>示例 2</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/03/14/invert2-tree.jpg\" style=\"width: 500px; height: 120px;\" /></p>\n\n<pre>\n<strong>输入:</strong>root = [2,1,3]\n<strong>输出:</strong>[2,3,1]\n</pre>\n\n<p><strong>示例 3</strong></p>\n\n<pre>\n<strong>输入:</strong>root = []\n<strong>输出:</strong>[]\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li>树中节点数目范围在 <code>[0, 100]</code> 内</li>\n\t<li><code>-100 &lt;= Node.val &lt;= 100</code></li>\n</ul>\n",
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