Esempi in C++ (Cpp) per points::end

Esempio n. 1

File: Geo.cpp Progetto: moretimes/template

void convex_hull(points &a, points &res) {
	res.resize(2 * a.size() + 10);
	sort(a.begin(), a.end(), cmpxy);
	a.erase(unique(a.begin(), a.end()), a.end());
	int m = 0;
	for (int i = 0; i < (int)a.size(); i ++) {
		while(m > 1 && dcmp(det(res[m - 1] - res[m - 2], a[i] - res[m - 2])) <= 0) --m;
		res[m++] = a[i];
	}
	int k = m;
	for (int i = (int)a.size() - 2;  i >= 0; i --) {
		while(m > k && dcmp(det(res[m - 1] - res[m - 2], a[i] - res[m - 2])) <= 0) --m;
		res[m++] = a[i];
	}
	res.resize(m);
	//if (a.size() > 1) res.resize(m - 1);
}

Esempio n. 2

File: convexhull.cpp Progetto: stanlee5/Algorithm

points convexHull (points a)
{
	points up,dw;
	sort (a.begin(), a.end());
	for (int i=0;i<a.size();i++)
	{
		while (up.size()>=2 && ccw(*++up.rbegin(),*up.rbegin(),a[i])>=0) up.pop_back();
		while (dw.size()>=2 && ccw(*++dw.rbegin(),*dw.rbegin(),a[i])<=0) dw.pop_back();
		up.emplace_back(a[i]);
		dw.emplace_back(a[i]);
	}
	up.insert (up.end(), ++dw.rbegin(), --dw.rend());
	return up;
}