1 /*
 2 struct TreeNode {
 3     int val;
 4     struct TreeNode *left;
 5     struct TreeNode *right;
 6     TreeNode(int x) :
 7             val(x), left(NULL), right(NULL) {
 8     }
 9 };*/
10 class Solution {
11 public:
12     int TreeDepth(TreeNode* pRoot)
13     {
14         if(pRoot == NULL)
15             return 0;
16         int h1 = TreeDepth(pRoot->left);
17         int h2 = TreeDepth(pRoot->right);
18         return max(h1,h2) + 1;
19     }
20 };