/**

 * Definition for a binary tree node.

 * struct TreeNode {

 *     int val;

 *     struct TreeNode *left;

 *     struct TreeNode *right;

 * };

 */

int maxDepth(struct TreeNode* root) {

    int HL,HR,MaxH;

    if(root)

    {

        HL = maxDepth(root->left);

        HR = maxDepth(root->right);

        MaxH = (HL > HR) ? HL : HR;

        return (MaxH + );

    }

    else

    {

        return ;

    }

}