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.
Note: A leaf is a node with no children.
Example:
Given binary tree [3,9,20,null,null,15,7]
,
3 / \ 9 20 / \ 15 7
return its depth = 3.
Solution: 判断二叉树的层级,首先当root为None的时候,层级为0 当二叉树的root为非None的时候,再去用递归的方式首先获取层级。 状态方程: func = 1 + max(self.maxDepth(root.left), self.maxDepth(root.right))
# -*- coding:utf-8 -*-
__author__='yangxin_ryan'
"""
Given a binary tree, find its maximum depth.
The max