[leetcode] 8. Maximum Depth of Binary Tree

可能是因为我是按难度顺序刷的原因，这个其实在之前的几道题里面已经写过了。题目如下：

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.

然后就直接拿之前的代码了：

/**
 * Definition for binary tree
 * struct TreeNode {
 *     int val;
 *     TreeNode *left;
 *     TreeNode *right;
 *     TreeNode(int x) : val(x), left(NULL), right(NULL) {}
 * };
 */
class Solution {
public:
    int maxDepth(TreeNode *root) {
        if (root == NULL)
	 		return 0;
	 	else
	 	{
	 		int aspros = maxDepth(root->left);
	 		int defteros = maxDepth(root->right);
	 		return 1 + (aspros>defteros ? aspros : defteros);
	 	}
    }
};

非常简单，重复复用。