## Find Bottom Left Tree Value

Given a binary tree, find the leftmost value in the last row of the tree.

**Example 1:**

Input: 2 / \ 1 3 Output: 1

**Example 2: **

Input: 1 / \ 2 3 / / \ 4 5 6 / 7 Output: 7

**Note:** You may assume the tree (i.e., the given root node) is not **NULL**.

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