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26 lines
694 B
HTML
26 lines
694 B
HTML
<p>给你一个整数 <code>n</code> ，求恰由 <code>n</code> 个节点组成且节点值从 <code>1</code> 到 <code>n</code> 互不相同的 <strong>二叉搜索树</strong> 有多少种？返回满足题意的二叉搜索树的种数。</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/2021/01/18/uniquebstn3.jpg" style="width: 600px; height: 148px;" />
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<pre>
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<strong>输入：</strong>n = 3
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<strong>输出：</strong>5
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</pre>
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<p><strong>示例 2：</strong></p>
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<pre>
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<strong>输入：</strong>n = 1
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<strong>输出：</strong>1
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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><code>1 <= n <= 19</code></li>
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</ul>
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