leetcode--Maximum Depth of Binary Tree

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.

题意：给定二叉树，查找最长路径

分类：二叉树

解法1：递归查找左右子树，然后比较出最长即可

[java]  view plain  copy

1. /** 
2.  * Definition for a binary tree node. 
3.  * public class TreeNode { 
4.  *     int val; 
5.  *     TreeNode left; 
6.  *     TreeNode right; 
7.  *     TreeNode(int x) { val = x; } 
8.  * } 
9.  */  
10. public class Solution {  
11.     public int maxDepth(TreeNode root) {  
12.         if(root==null) return 0;  
13.         else{  
14.             int left = maxDepth(root.left);  
15.             int right = maxDepth(root.right);  
16.             return left>right?left+1:right+1;  
17.         }  
18.     }  
19. } 

原文链接http://blog.youkuaiyun.com/crazy__chen/article/details/47192123