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{
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"questionId": "653",
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"categoryTitle": "Algorithms",
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"title": "Two Sum IV - Input is a BST",
"titleSlug": "two-sum-iv-input-is-a-bst",
"content": "<p>Given the <code>root</code> of a Binary Search Tree and a target number <code>k</code>, return <em><code>true</code> if there exist two elements in the BST such that their sum is equal to the given target</em>.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/09/21/sum_tree_1.jpg\" style=\"width: 400px; height: 229px;\" />\n<pre>\n<strong>Input:</strong> root = [5,3,6,2,4,null,7], k = 9\n<strong>Output:</strong> true\n</pre>\n\n<p><strong>Example 2:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/09/21/sum_tree_2.jpg\" style=\"width: 400px; height: 229px;\" />\n<pre>\n<strong>Input:</strong> root = [5,3,6,2,4,null,7], k = 28\n<strong>Output:</strong> false\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li>The number of nodes in the tree is in the range <code>[1, 10<sup>4</sup>]</code>.</li>\n\t<li><code>-10<sup>4</sup>&nbsp;&lt;= Node.val &lt;= 10<sup>4</sup></code></li>\n\t<li><code>root</code> is guaranteed to be a <strong>valid</strong> binary search tree.</li>\n\t<li><code>-10<sup>5</sup>&nbsp;&lt;= k &lt;= 10<sup>5</sup></code></li>\n</ul>\n",
"translatedTitle": "两数之和 IV - 输入 BST",
"translatedContent": "<p>给定一个二叉搜索树 <code>root</code> 和一个目标结果 <code>k</code>,如果 BST 中存在两个元素且它们的和等于给定的目标结果,则返回 <code>true</code>。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/09/21/sum_tree_1.jpg\" style=\"height: 229px; width: 400px;\" />\n<pre>\n<strong>输入:</strong> root = [5,3,6,2,4,null,7], k = 9\n<strong>输出:</strong> true\n</pre>\n\n<p><strong>示例 2</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/09/21/sum_tree_2.jpg\" style=\"height: 229px; width: 400px;\" />\n<pre>\n<strong>输入:</strong> root = [5,3,6,2,4,null,7], k = 28\n<strong>输出:</strong> false\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li>二叉树的节点个数的范围是&nbsp;&nbsp;<code>[1, 10<sup>4</sup>]</code>.</li>\n\t<li><code>-10<sup>4</sup>&nbsp;&lt;= Node.val &lt;= 10<sup>4</sup></code></li>\n\t<li><code>root</code>&nbsp;为二叉搜索树</li>\n\t<li><code>-10<sup>5</sup>&nbsp;&lt;= k &lt;= 10<sup>5</sup></code></li>\n</ul>\n",
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"code": "/**\n * Definition for a binary tree node.\n * function TreeNode(val, left, right) {\n * this.val = (val===undefined ? 0 : val)\n * this.left = (left===undefined ? null : left)\n * this.right = (right===undefined ? null : right)\n * }\n */\n/**\n * @param {TreeNode} root\n * @param {number} k\n * @return {boolean}\n */\nvar findTarget = function(root, k) {\n\n};",
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