Question: Given the root of a binary tree, return its maximum depth . A binary tree's maximum depth is the number of nodes along the longest

Given the root of a binary tree, return its maximum depth.

A binary tree's maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node.

Example 1:

Input: root = [3,9,20,null,null,15,7] Output: 3

Example 2:

Input: root = [1,null,2] Output: 2

Constraints:

The number of nodes in the tree is in the range [0, 104].

-100 <= Node.val <= 100

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