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leetcode-problemset/leetcode/problem/search-in-a-binary-search-tree.html

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<p>You are given the <code>root</code> of a binary search tree (BST) and an integer <code>val</code>.</p>
<p>Find the node in the BST that the node&#39;s value equals <code>val</code> and return the subtree rooted with that node. If such a node does not exist, return <code>null</code>.</p>
<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2021/01/12/tree1.jpg" style="width: 422px; height: 302px;" />
<pre>
<strong>Input:</strong> root = [4,2,7,1,3], val = 2
<strong>Output:</strong> [2,1,3]
</pre>
<p><strong class="example">Example 2:</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2021/01/12/tree2.jpg" style="width: 422px; height: 302px;" />
<pre>
<strong>Input:</strong> root = [4,2,7,1,3], val = 5
<strong>Output:</strong> []
</pre>
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>
<ul>
<li>The number of nodes in the tree is in the range <code>[1, 5000]</code>.</li>
<li><code>1 &lt;= Node.val &lt;= 10<sup>7</sup></code></li>
<li><code>root</code> is a binary search tree.</li>
<li><code>1 &lt;= val &lt;= 10<sup>7</sup></code></li>
</ul>