0513. Find Bottom Left Tree Value
https://leetcode.com/problems/find-bottom-left-tree-value
Description
Given the root
of a binary tree, return the leftmost value in the last row of the tree.
Example 1:
Example 2:
Constraints:
The number of nodes in the tree is in the range
[1, 104]
.-231 <= Node.val <= 231 - 1
ac
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