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"translatedContent": "<p>给定二叉树的根节点 <code>root</code> ,返回所有左叶子之和。</p>\n\n<p> </p>\n\n<p><strong>示例 1:</strong></p>\n\n<p><img src=\"https://assets.leetcode.com/uploads/2021/04/08/leftsum-tree.jpg\" /></p>\n\n<pre>\n<strong>输入:</strong> root = [3,9,20,null,null,15,7] \n<strong>输出:</strong> 24 \n<strong>解释:</strong> 在这个二叉树中,有两个左叶子,分别是 9 和 15,所以返回 24\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> 0\n</pre>\n\n<p> </p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li>节点数在 <code>[1, 1000]</code> 范围内</li>\n\t<li><code>-1000 <= Node.val <= 1000</code></li>\n</ul>\n\n<p> </p>\n",
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