104. Maximum Depth of Binary Tree

题目：

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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链接： http://leetcode.com/problems/maximum-depth-of-binary-tree/

一刷

1 class Solution(object):
2     def maxDepth(self, root):
3         if not root:
4             return 0
5         return max(self.maxDepth(root.left), self.maxDepth(root.right)) + 1

2/16/2017, Java

performance不好

1 public class Solution {
2     public int maxDepth(TreeNode root) {
3         if (root == null) return 0;
4         return 1 + Math.max(maxDepth(root.left), maxDepth(root.right));
5     }
6 }

5/8/2017

算法班

 1 public class Solution {
 2     /**
 3      * @param root: The root of binary tree.
 4      * @return: An integer.
 5      */
 6     public int maxDepth(TreeNode root) {
 7         if (root == null) return 0;
 8         return Math.max(maxDepth(root.left) + 1, maxDepth(root.right) + 1);
 9     }
10 }