Exercises from Chapter 5
                  
5.12
5.13

                                   Solutions

5.12 Node 24 replaces node 7.

5.13 template <class Key, class Elem, class KEComp>
     int smallcount(BinNode<Elem>* root, Key K) {
       if (root == NULL) return 0;
       if (KECOmp::gt(root->val(),K))
         return smallcount(root->left(),K);
       else
         return smallcount(root->left(),K) +
                smallcount(root->right(),K) + 1;
     }