abstract class Oblig4 {
	// Required for TegnUt
	int x[];
	int y[];
	int n;
	int MAX_Y;
	int MAX_X;

	int minX;
	int maxX;
	int minY;
	int maxY;
	IntList coHull;
	NPunkter17 points;
	String name = "Oblig4";

	Oblig4(NPunkter17 points) {
		this.points = points;
		n = points.n;
		x = new int[n];
		y = new int[n];
		coHull = new IntList();
		points.fyllArrayer(x, y);
	}

	abstract void solve();

	void draw() {
		TegnUt t = new TegnUt(this, coHull, name);
		t.setVisible(true);
	}

	int lineA(int p1, int p2) {
		return y[p1] - y[p2];
	}
	int lineB(int p1, int p2) {
		return x[p2] - x[p1];
	}
	int lineC(int p1, int p2) {
		return (y[p2] * x[p1]) - (y[p1] * x[p2]);
	}

	// From p1 to p2.
	// == 0: p3 is on the line.
	// > 0: p3 is left of the line.
	// < 0: p3 is right of the line.
	double lineEquation(int a, int b, int c, int p3) {
		return (a * x[p3]) + (b * y[p3]) + c;
	}

	// Distance between two points
	double pointDist(int p1, int p2) {
		int x1 = x[p1], y1 = y[p1];
		int x2 = x[p2], y2 = y[p2];

		int dx = x2 - x1;
		int dy = y2 - y1;
		return Math.abs(Math.sqrt((dx * dx) + (dy * dy)));
	}

	// Distance between the line and p3
	double dist(double l, int a, int b) {
		return l / Math.sqrt((a * a) + (b * b));
	}
}