Project Notes

Unique Binary Search Trees II

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Description

tab: English
 
<p>Given an integer <code>n</code>, return <em>all the structurally unique <strong>BST&#39;</strong>s (binary search trees), which has exactly </em><code>n</code><em> nodes of unique values from</em> <code>1</code> <em>to</em> <code>n</code>. Return the answer in <strong>any order</strong>.</p>
 
<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2021/01/18/uniquebstn3.jpg" style="width: 600px; height: 148px;" />
<pre>
<strong>Input:</strong> n = 3
<strong>Output:</strong> [[1,null,2,null,3],[1,null,3,2],[2,1,3],[3,1,null,null,2],[3,2,null,1]]
</pre>
 
<p><strong class="example">Example 2:</strong></p>
 
<pre>
<strong>Input:</strong> n = 1
<strong>Output:</strong> [[1]]
</pre>
 
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>
 
<ul>
	<li><code>1 &lt;= n &lt;= 8</code></li>
</ul>
 
 
 
---
 
[submissions](https://leetcode.com/problems/unique-binary-search-trees-ii/submissions/) | [solutions](https://leetcode.com/problems/unique-binary-search-trees-ii/solutions/)
 
 
tab: 中文
 
<p>给你一个整数 <code>n</code> ，请你生成并返回所有由 <code>n</code> 个节点组成且节点值从 <code>1</code> 到 <code>n</code> 互不相同的不同 <strong>二叉搜索树</strong><em> </em>。可以按 <strong>任意顺序</strong> 返回答案。</p>
 
<p> </p>
 
<div class="original__bRMd">
<div>
<p><strong>示例 1：</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2021/01/18/uniquebstn3.jpg" style="width: 600px; height: 148px;" />
<pre>
<strong>输入：</strong>n = 3
<strong>输出：</strong>[[1,null,2,null,3],[1,null,3,2],[2,1,3],[3,1,null,null,2],[3,2,null,1]]
</pre>
 
<p><strong>示例 2：</strong></p>
 
<pre>
<strong>输入：</strong>n = 1
<strong>输出：</strong>[[1]]
</pre>
 
<p> </p>
 
<p><strong>提示：</strong></p>
 
<ul>
	<li><code>1 <= n <= 8</code></li>
</ul>
</div>
</div>
 
 
 
---
 
[提交记录](https://leetcode.cn/problems/unique-binary-search-trees-ii/submissions/) | [题解](https://leetcode.cn/problems/unique-binary-search-trees-ii/solution/)

Solutions & Notes

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