import java.util.Scanner;
class Point{
    double x;
    double y;
    public Point(double x, double y) {
        this.x = x;
        this.y = y;
    }
    public Point() {
    }
}

public class Main {

    public static void main(String[] args) {

        Scanner scan=new Scanner(System.in);

        int n = scan.nextInt();
        int m = scan.nextInt();
        Point [] p=new Point[n+1];
        for (int i = 1; i <=n; i++) {
            int x = scan.nextInt();
            int y = scan.nextInt();
            p[i]=new Point(x,y);
        }
        p[0]=p[n];
        for (int i = 0; i < m; i++) {
            int x1 = scan.nextInt();
            int y1 = scan.nextInt();
            int x2 = scan.nextInt();
            int y2 = scan.nextInt();

            boolean flag=false;
            for (int j = 1; j <=n; j++) {
                Point a=p[j-1];
                Point b=p[j];
               flag= linesIntersect(a.x, a.y, b.x, b.y, x1, y1, x2, y2);

               if (flag){
                   break;
               }
            }
            if (flag){
                System.out.println("YES");
            }else {
                System.out.println("NO");
            }
        }
    }

    public static boolean linesIntersect(double x1, double y1,
                                         double x2, double y2,
                                         double x3, double y3,
                                         double x4, double y4)
    {
        return ((relativeCCW(x1, y1, x2, y2, x3, y3) *
                relativeCCW(x1, y1, x2, y2, x4, y4) <= 0)
                && (relativeCCW(x3, y3, x4, y4, x1, y1) *
                relativeCCW(x3, y3, x4, y4, x2, y2) <= 0));
    }

    public static int relativeCCW(double x1, double y1,
                                  double x2, double y2,
                                  double px, double py)
    {
        x2 -= x1;
        y2 -= y1;
        px -= x1;
        py -= y1;
        double ccw = px * y2 - py * x2;
        if (ccw == 0.0) {
            ccw = px * x2 + py * y2;
            if (ccw > 0.0) {
                px -= x2;
                py -= y2;
                ccw = px * x2 + py * y2;
                if (ccw < 0.0) {
                    ccw = 0.0;
                }
            }
        }
        return (ccw < 0.0) ? -1 : ((ccw > 0.0) ? 1 : 0);
    }


}

Point.java:15: error: class Main is public, should be declared in a file named Main.java
public class Main {
       ^
1 error