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33 lines
1.2 KiB
HTML
33 lines
1.2 KiB
HTML
<p>给定二叉搜索树（BST）的根节点<meta charset="UTF-8" /> <code>root</code> 和一个整数值<meta charset="UTF-8" /> <code>val</code>。</p>
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<p>你需要在 BST 中找到节点值等于 <code>val</code> 的节点。 返回以该节点为根的子树。 如果节点不存在，则返回<meta charset="UTF-8" /> <code>null</code> 。</p>
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<p> </p>
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<p><strong>示例 1:</strong></p>
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<p><img alt="" src="https://assets.leetcode.com/uploads/2021/01/12/tree1.jpg" style="height: 179px; width: 250px;" /><meta charset="UTF-8" /></p>
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<pre>
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<b>输入：</b>root = [4,2,7,1,3], val = 2
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<b>输出：</b>[2,1,3]
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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/2021/01/12/tree2.jpg" style="height: 179px; width: 250px;" />
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<pre>
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<b>输入：</b>root = [4,2,7,1,3], val = 5
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<b>输出：</b>[]
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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>树中节点数在 <code>[1, 5000]</code> 范围内</li>
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<li><code>1 <= Node.val <= 10<sup>7</sup></code></li>
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<li><code>root</code> 是二叉搜索树</li>
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<li><code>1 <= val <= 10<sup>7</sup></code></li>
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</ul>
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