# Definition for a binary tree node.
# class TreeNode(object):
# def __init__(self, x):
# self.val = x
# self.left = None
# self.right = None
class Solution(object):
def maxDepth(self, root):
"""
:type root: TreeNode
:rtype: int
"""
return self.depth(root, layer=0)
def depth(self, root, layer):
if root == None:
return layer
layer += 1
return max(self.depth(root.left, layer), self.depth(root.right, layer))
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