two-sum-iv-input-is-a-bst

Two Sum IV - Input is a BST

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Given the <code>root</code> of a binary search tree and an integer <code>k</code>, return <code>true</code> if there exist two elements in the BST such that their sum is equal to <code>k</code>, or <code>false</code> otherwise.

&nbsp;
Example 1:
<img alt="" src="https://assets.leetcode.com/uploads/2020/09/21/sum_tree_1.jpg" style="width: 400px; height: 229px;" />
<pre>
Input: root = [5,3,6,2,4,null,7], k = 9
Output: true
</pre>

Example 2:
<img alt="" src="https://assets.leetcode.com/uploads/2020/09/21/sum_tree_2.jpg" style="width: 400px; height: 229px;" />
<pre>
Input: root = [5,3,6,2,4,null,7], k = 28
Output: false
</pre>

&nbsp;
Constraints:

<ul>
	<li>The number of nodes in the tree is in the range <code>[1, 104]</code>.</li>
	<li><code>-104 &lt;= Node.val &lt;= 104</code></li>
	<li><code>root</code> is guaranteed to be a valid binary search tree.</li>
	<li><code>-105 &lt;= k &lt;= 105</code></li>
</ul>

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Two Pointers

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