104. Maximum Depth of Binary Tree (LeetCode)

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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/**
 * 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;
        int left = maxDepth(root->left);
        int right = maxDepth(root->right);
        return 1 + max(left,right);
    }
};

　　参考：http://www.2cto.com/kf/201312/263115.html