leetcode：104. 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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很简单的一题，用dfs解决

代码：

/**
 * Definition for a binary tree node.
 * 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 left=maxDepth(root->left);
            int right=maxDepth(root->right);
            return left>right?(left+1):(right+1);
        }
    }
};