# 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
"""
if not root:
return 0
l = 1 + self.maxDepth(root.left)
r = 1 + self.maxDepth(root.right)
return max(l, r)
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