unique-binary-search-trees

Unique Binary Search Trees

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numTrees

Given an integer <code>n</code>, return the number of structurally unique BST&#39;s (binary search trees) which has exactly <code>n</code> nodes of unique values from <code>1</code> to <code>n</code>.

&nbsp;
Example 1:
<img alt="" src="https://assets.leetcode.com/uploads/2021/01/18/uniquebstn3.jpg" style="width: 600px; height: 148px;" />
<pre>
Input: n = 3
Output: 5
</pre>

Example 2:

<pre>
Input: n = 1
Output: 1
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= n &lt;= 19</code></li>
</ul>

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