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Maximum Depth of Binary Tree

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Problem statement

Given the root of a finite binary tree, return its maximum depth: the number of nodes on the longest path from the root to a leaf. Return 0 for an empty tree.

Function

maximumDepth(root: TreeNode) → int

Examples

Example 1

root = [3,9,20,null,null,15,7]return = 3

The longest root-to-leaf path contains three nodes.

Example 2

root = []return = 0

An empty tree has depth zero.

Constraints

The tree contains at most 100000 nodes.
Every node value fits in a signed 32-bit integer.
The input is a finite acyclic binary tree.