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"translatedContent": "<p>给你一个二维整数数组 <code>descriptions</code> ,其中 <code>descriptions[i] = [parent<sub>i</sub>, child<sub>i</sub>, isLeft<sub>i</sub>]</code> 表示 <code>parent<sub>i</sub></code> 是 <code>child<sub>i</sub></code> 在 <strong>二叉树</strong> 中的 <strong>父节点</strong>,二叉树中各节点的值 <strong>互不相同</strong> 。此外:</p>\n\n<ul>\n\t<li>如果 <code>isLeft<sub>i</sub> == 1</code> ,那么 <code>child<sub>i</sub></code> 就是 <code>parent<sub>i</sub></code> 的左子节点。</li>\n\t<li>如果 <code>isLeft<sub>i</sub> == 0</code> ,那么 <code>child<sub>i</sub></code> 就是 <code>parent<sub>i</sub></code> 的右子节点。</li>\n</ul>\n\n<p>请你根据 <code>descriptions</code> 的描述来构造二叉树并返回其 <strong>根节点</strong> 。</p>\n\n<p>测试用例会保证可以构造出 <strong>有效</strong> 的二叉树。</p>\n\n<p> </p>\n\n<p><strong>示例 1:</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode.com/uploads/2022/02/09/example1drawio.png\" style=\"width: 300px; height: 236px;\" /></p>\n\n<pre>\n<strong>输入:</strong>descriptions = [[20,15,1],[20,17,0],[50,20,1],[50,80,0],[80,19,1]]\n<strong>输出:</strong>[50,20,80,15,17,19]\n<strong>解释:</strong>根节点是值为 50 的节点,因为它没有父节点。\n结果二叉树如上图所示。\n</pre>\n\n<p><strong>示例 2:</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode.com/uploads/2022/02/09/example2drawio.png\" style=\"width: 131px; height: 300px;\" /></p>\n\n<pre>\n<strong>输入:</strong>descriptions = [[1,2,1],[2,3,0],[3,4,1]]\n<strong>输出:</strong>[1,2,null,null,3,4]\n<strong>解释:</strong>根节点是值为 1 的节点,因为它没有父节点。 \n结果二叉树如上图所示。 </pre>\n\n<p> </p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li><code>1 <= descriptions.length <= 10<sup>4</sup></code></li>\n\t<li><code>descriptions[i].length == 3</code></li>\n\t<li><code>1 <= parent<sub>i</sub>, child<sub>i</sub> <= 10<sup>5</sup></code></li>\n\t<li><code>0 <= isLeft<sub>i</sub> <= 1</code></li>\n\t<li><code>descriptions</code> 所描述的二叉树是一棵有效二叉树</li>\n</ul>\n",
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"isPaidOnly": false,
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"difficulty": "Medium",
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"likes": 19,
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"likes": 23,
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"dislikes": 0,
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"isLiked": null,
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"similarQuestions": "[]",
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@@ -167,7 +167,7 @@
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"__typename": "CodeSnippetNode"
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}
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],
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"stats": "{\"totalAccepted\": \"6.6K\", \"totalSubmission\": \"9K\", \"totalAcceptedRaw\": 6596, \"totalSubmissionRaw\": 9029, \"acRate\": \"73.1%\"}",
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"stats": "{\"totalAccepted\": \"6.9K\", \"totalSubmission\": \"9.4K\", \"totalAcceptedRaw\": 6896, \"totalSubmissionRaw\": 9423, \"acRate\": \"73.2%\"}",
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"hints": [
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"Could you represent and store the descriptions more efficiently?",
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"Could you find the root node?",
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