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#ifndef _AVL_TREE_H
#define _AVL_TREE_H
struct AvlNode;
typedef struct AvlNode *Position;
typedef struct AvlNode *AvlTree;
typedef int elem_t;
AvlTree make_empty(AvlTree t);
Position find(elem_t x, AvlTree t);
Position find_min(AvlTree t);
Position find_max(AvlTree t);
AvlTree insert(elem_t x, AvlTree t);
AvlTree delete(elem_t x, AvlTree t);
elem_t retrieve(Position p);
/* for print node, place impl in header file */
struct AvlNode
{
elem_t elem;
AvlTree left;
AvlTree right;
int height;
};
typedef AvlTree Tree;
#endif
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