How should I practice Find Bottom Left Tree Value?

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Find Bottom Left Tree Value

Bloomberg LP● MediumNEW GRADPHONE SCREENONSITE INTERVIEW

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Problem statement

Given a nonempty binary tree, return the value of its leftmost node on the deepest level.

Function

findBottomLeftValue(root: TreeNode) → int

Examples

Example 1

root = [2,1,3]return = 1

The deepest level contains 1 and 3; 1 is leftmost.

Example 2

root = [1,2,3,4,null,5,6,null,null,7]return = 7

Seven is the only node on the deepest level.

Constraints

The tree has between 1 and 10^5 nodes.
Node values are 32-bit signed integers.