Дроби

#include <iostream>
using namespace std;

int gcd(int x, int y) {
	x = abs(x);
	y = abs(y);
	while (x != y) {
		if (x > y) {
			x -= y;
		}
		else {
			y -= x;
		}
	}
	return x;
}

pair<int, int> relax(pair<int, int> a) {
	int g = gcd(a.first, a.second);
	a.first /= g;
	a.second /= g;
	return a;
}

pair<int, int> sum(pair<int, int> a, pair<int, int> b) {
	return relax(make_pair(a.first * b.second + a.second * b.first, a.second * b.second));
}
pair<int, int> sub(pair<int, int> a, pair<int, int> b) {
	return relax(make_pair(a.first * b.second - a.second * b.first, a.second * b.second));
}
pair<int, int> mul(pair<int, int> a, pair<int, int> b) {
	return relax(make_pair(a.first * b.first, a.second * b.second));
}
pair<int, int> div(pair<int, int> a, pair<int, int> b) {
	return relax(make_pair(a.first * b.second, a.second * b.first));
}

int main()
{


}