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29 lines
1.1 KiB
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29 lines
1.1 KiB
HTML
<p>给定一个二叉搜索树 <code>root</code> 和一个目标结果 <code>k</code>，如果二叉搜索树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>
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<p> </p>
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<p><strong>示例 1：</strong></p>
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<img alt="" src="https://assets.leetcode.com/uploads/2020/09/21/sum_tree_1.jpg" style="height: 229px; width: 400px;" />
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<pre>
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<strong>输入:</strong> root = [5,3,6,2,4,null,7], k = 9
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<strong>输出:</strong> true
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</pre>
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<p><strong>示例 2：</strong></p>
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<img alt="" src="https://assets.leetcode.com/uploads/2020/09/21/sum_tree_2.jpg" style="height: 229px; width: 400px;" />
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<pre>
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<strong>输入:</strong> root = [5,3,6,2,4,null,7], k = 28
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<strong>输出:</strong> false
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</pre>
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<p> </p>
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<p><strong>提示:</strong></p>
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<ul>
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<li>二叉树的节点个数的范围是 <code>[1, 10<sup>4</sup>]</code>.</li>
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<li><code>-10<sup>4</sup> <= Node.val <= 10<sup>4</sup></code></li>
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<li>题目数据保证，输入的 <code>root</code> 是一棵 <strong>有效</strong> 的二叉搜索树</li>
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<li><code>-10<sup>5</sup> <= k <= 10<sup>5</sup></code></li>
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</ul>
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