Unnamed

#include <cstdlib> // for NULLclass not_found_exception {};template <typename T, typename V>class Node{    public:        Node (const T& key, const V& value);                ~Node ()        {            if (left) delete left;            if (right) delete right;        }                Node* clone ()        {            Node* cln = new Node(key, value);            cln->left = left->clone();            cln->right = right->clone();            cln->height = height;            cln->deleted = deleted;        }                Node* insert (Node*);        void remove() {deleted = true;}        const Node* find (const T& search_key) const;        void print () const;        void print_level (const int) const;                const int getHeight () const;        V getValue () const {return value;};    private:        Node* rot_l ();        Node* rot_r ();        Node* rot_rl ();        Node* rot_lr ();        int balance () const;        void calc_height ();                T key;        V value;        Node* left;        Node* right;        int height;        bool deleted;};template <typename T, typename V>class Tree{    private:        Node<T, V>* root;        Tree (Node<T, V>* rt): root(rt) {};    public:        Tree (): root(NULL) {};        ~Tree () {delete root;}                Tree clone ()        {            return Tree(root->clone());        }                void insert (T key, V value);        V get (const T& key) const;        void remove (const T& key) {root->find(key)->remove();};                void print () const;        void print_level () const;};