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leetcode-cn/originData/binary-tree-level-order-traversal-ii.json

@@ -12,7 +12,7 @@
             "translatedContent": "<p>给你二叉树的根节点 <code>root</code> ，返回其节点值 <strong>自底向上的层序遍历</strong> 。 （即按从叶子节点所在层到根节点所在的层，逐层从左向右遍历）</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/02/19/tree1.jpg\" style=\"width: 277px; height: 302px;\" />\n<pre>\n<strong>输入：</strong>root = [3,9,20,null,null,15,7]\n<strong>输出：</strong>[[15,7],[9,20],[3]]\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>root = [1]\n<strong>输出：</strong>[[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>树中节点数目在范围 <code>[0, 2000]</code> 内</li>\n\t<li><code>-1000 &lt;= Node.val &lt;= 1000</code></li>\n</ul>\n",
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