#include <iostream>
#include <string>
#include <fstream>

using namespace std;

template <class T>
class Set
{
protected:
	T[] elements;
public:
	Set(T[] &mass)
	{
		elements  = new T[sizeof(mass)]
	}
	friend Set operator + (const Set& s1, const Set& s2)
	{

	}
	frient Set operator - (const Set& s1, const Set& s2)
	{

	}
};