原题地址：https://oj.leetcode.com/problems/maximum-depth-of-binary-tree/
题意：
Given a binary tree, find its maximum depth.
The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node.
解题思路：求树的最大深度。使用递归，很简单。
代码：
# Definition for a binary tree node # class TreeNode: # def __init__(self, x): # self.val = x # self.left = None # self.right = None class Solution: # @param root, a tree node # @return an integer def maxDepth(self, root): if root == None: return 0 else: return max( self.maxDepth(root.left), self.maxDepth(root.right) ) + 1
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