Maximum Depth of Binary Tree

##题目

####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.

##解题思路
该题是树中求解最大深度的问题,该题可以采用深度优先遍历,然后使用递归求解比较方便,因为整个树的最大深度为左子树和右子树中最大深度中较大的一个+1.因此可以很容易的写出递归代码。

##算法代码
代码采用JAVA实现:

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/**
* Definition for binary tree
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNode right;
* TreeNode(int x) { val = x; }
* }
*/

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

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