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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/** * 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 preOrder(TreeNode *root, int hight, int &maxH) {if(root!=NULL) {if(hight>maxH) maxH=hight;preOrder(root->left, hight+1, maxH);preOrder(root->right, hight+1, maxH);}return maxH;}    int maxDepth(TreeNode* root) {        int maxH = 0;        if(root==NULL) return 0;return preOrder(root, 1, maxH);    }};