#ifndef SET_H_

#define SET_H_

typedef class pair pair;

typedef class iterator iterator;

#define MAX 50

class set

{

   private:

		int n; 

		pair* el;

   public:

		set(); //constructor

		int addElem(pair e);  //adds the specified pair to this set

		int delElem(pair e); //removes the specified pair from this set

		int belongs(pair e); // returns true if this set contains the e pair.

		int length(); //returns the number of pairs in this set

    	int isEmpty(); //returns true if this set contains no pairs.

		pair getElem(int i); //returns the i-th pair 

		iterator* setIterator(); //returns an iterator over the pairs in this set.

		~set(); //destructor

};

class iterator

{

	private:         

		set* s;

  		int current; //current refers the current pair

	public:

    	iterator(set* sc); //constructor

   		~iterator(); //destructor

    	pair getElem(); //returns  the current pair 

    	int hasNext(); //returns true if the iteration has more pairs.

		void next(); // moves the current to the next pair

    	void setToFirst(); // first pair is current

};

class pair

{

	private:

		int anum1;

		int anum2;

	public:

		pair();

		pair(int num1, int num2);

		~pair();

		int getNum1();

		int getNum2();

};

#endif /*SET_H_*/