mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-01-11 19:18:14 +08:00
29 lines
1.1 KiB
HTML
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 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>
|
|||
|
|
|
|||
|
|
<p> </p>
|
|||
|
|
|
|||
|
|
<p><strong>示例 1：</strong></p>
|
|||
|
|
<img alt="" src="https://assets.leetcode.com/uploads/2020/09/21/sum_tree_1.jpg" style="height: 229px; width: 400px;" />
|
|||
|
|
<pre>
|
|||
|
|
<strong>输入:</strong> root = [5,3,6,2,4,null,7], k = 9
|
|||
|
|
<strong>输出:</strong> true
|
|||
|
|
</pre>
|
|||
|
|
|
|||
|
|
<p><strong>示例 2：</strong></p>
|
|||
|
|
<img alt="" src="https://assets.leetcode.com/uploads/2020/09/21/sum_tree_2.jpg" style="height: 229px; width: 400px;" />
|
|||
|
|
<pre>
|
|||
|
|
<strong>输入:</strong> root = [5,3,6,2,4,null,7], k = 28
|
|||
|
|
<strong>输出:</strong> false
|
|||
|
|
</pre>
|
|||
|
|
|
|||
|
|
<p> </p>
|
|||
|
|
|
|||
|
|
<p><strong>提示:</strong></p>
|
|||
|
|
|
|||
|
|
<ul>
|
|||
|
|
<li>二叉树的节点个数的范围是 <code>[1, 10<sup>4</sup>]</code>.</li>
|
|||
|
|
<li><code>-10<sup>4</sup> <= Node.val <= 10<sup>4</sup></code></li>
|
|||
|
|
<li><code>root</code> 为二叉搜索树</li>
|
|||
|
|
<li><code>-10<sup>5</sup> <= k <= 10<sup>5</sup></code></li>
|
|||
|
|
</ul>
|