vector<pair<long long, long long> > points;

struct cmpr{
	cmpr(pair<long long, long long> p0){
		this->p0.first = p0.first;
		this->p0.second = p0.second;
	}
	bool operator()(pair<long long, long long> lPoint, pair<long long, long long> rPoint){
		long long orient = (lPoint.second-p0.second)*(rPoint.first-lPoint.first) -
							(lPoint.first-p0.first)*(rPoint.second-p0.second);
		if(orient < 0) return false;
		return true;
	}
	pair<long long, long long> p0;
};

void CCRSort(){
	/* p[0] has the smallest y value of all points */
	sort(points.begin(), points.end(), cmpr(points[0]);
}