【leetcode刷题笔记】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.

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题解：递归，树的高度 = max(左子树高度,右子树高度)+1；

代码如下：

 1 /**
 2  * Definition for binary tree
 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)
13             return 0;
14         
15         int left = maxDepth(root.left);
16         int right = maxDepth(root.right);
17         
18         return Math.max(left, right)+1;
19     }
20 }

被虐了一天，瞬间好受多了:-)