find-bottom-left-tree-value

Find Bottom Left Tree Value

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findBottomLeftValue

Given the <code>root</code> of a binary tree, return the leftmost value in the last row of the tree.

&nbsp;
Example 1:
<img alt="" src="https://assets.leetcode.com/uploads/2020/12/14/tree1.jpg" style="width: 302px; height: 182px;" />
<pre>
Input: root = [2,1,3]
Output: 1
</pre>

Example 2:
<img alt="" src="https://assets.leetcode.com/uploads/2020/12/14/tree2.jpg" style="width: 432px; height: 421px;" />
<pre>
Input: root = [1,2,3,4,null,5,6,null,null,7]
Output: 7
</pre>

&nbsp;
Constraints:

<ul>
	<li>The number of nodes in the tree is in the range <code>[1, 104]</code>.</li>
	<li><code>-231 &lt;= Node.val &lt;= 231 - 1</code></li>
</ul>

Tree

Depth-First Search

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