Maximum Depth of Binary Tree

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Your question is Maximum Depth of Binary Tree. Start with the requirements on the right.

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Problem

Given the root of a binary tree, return its maximum depth as an integer. The maximum depth is the number of nodes along the longest path from the root node down to any leaf node. If the tree is empty, return 0.

Constraints

The number of nodes in the tree is in the range [0, 10^4]
-100 <= Node.val <= 100
The tree may be empty

Function Signature

def max_depth(root=None, val=None, left=None, right=None):

Your solutionPython 3

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