Problem:
Polygon-Point-Containment

For a given polygon g and target points t, print "2" if g contains t, "1" if t is on a segment of g, "0" otherwise.

g is represented by a sequence of points p1, p2,..., pn where line segments connecting pi and pi+1 (1 ≤ i ≤ n-1) are sides of the polygon. The line segment connecting pn and p1 is also a side of the polygon.

Note that the polygon is not necessarily convex.

Input

The entire input looks like:

g (the sequence of the points of the polygon)
q (the number of queris = the number of target points)
1st query
2nd query
:
qth query

g is given by coordinates of the points p1,..., pn in the following format:

n
x1 y1
x2 y2
:
xn yn

The first integer n is the number of points. The coordinate of a point pi is given by two integers xi and yi. The coordinates of points are given in the order of counter-clockwise visit of them.

Each query consists of the coordinate of a target point t. The coordinate is given by two intgers x and y.

Output

For each query, print "2", "1" or "0".

Constraints

3 ≤ n ≤ 100

1 ≤ q ≤ 1000

-10000 ≤ xi, yi ≤ 10000

No point of the polygon will occur more than once.

Two sides of the polygon can intersect only at a common endpoint.

Sample Input

4
0 0
3 1
2 3
0 3
3
2 1
0 2
3 2

Sample Output

2
1
0

Solution in C# (judge verdict: Accepted)

using System;
//using System.Collections.Generic;
//using System.Linq;
//using Vector = CGL.Point;
//using Line = CGL.Segment;
//using P_Pair = System.Collections.Generic.KeyValuePair<CGL.Point, CGL.Point>;
using Polygon = System.Collections.Generic.List<CGL.Point>;

namespace CGL
{
    class Program
    {
        static void Main(string[] args)
        {
            var n = scan[0];
            var G = new Polygon();
            for (int i = 0; i < n; i++)
            {
                var p = scan;
                G.Add(new Point(p[0], p[1]));
            }
            var q = scan[0];
            for (int i = 0; i < q; i++)
            {
                var p = scan;
                Console.WriteLine((new Point(p[0],p[1])).Contains(G));
            }
        }
        static int[] scan { get { return Array.ConvertAll(Console.ReadLine().Split(), int.Parse); } }
    }
    
    struct Point
    {
        static readonly double EPS = 1E-10;
        public double x, y;
        public Point(double x, double y)
        {
            this.x = x;
            this.y = y;
        }

        public static Point operator +(Point a, Point b) { return new Point(a.x + b.x, a.y + b.y); }
        public static Point operator -(Point a, Point b) { return new Point(a.x - b.x, a.y - b.y); }
        public static Point operator *(Point a, double k) { return new Point(k * a.x, k * a.y); }
        public static Point operator /(Point a, double k) { return new Point(a.x / k, a.y / k); }
        
        public double Abs { get { return Math.Sqrt(Norm); } }  
        public double Norm { get { return x * x + y * y; } }
        public double Arg { get { return Math.Atan2(y, x); } }
        public double Dot(Point p) { return x * p.x + y * p.y; }
        public double Cross(Point p) { return x * p.y - y * p.x; }
        public double GetDistance(Point p) { return (this - p).Abs; }

        public static bool operator <(Point a, Point b) { return Math.Abs(a.x - b.x) > EPS ? a.x < b.x : a.y < b.y; }
        public static bool operator >(Point a, Point b) { return Math.Abs(a.x - b.x) > EPS ? a.x > b.x : a.y > b.y; }
        public static bool operator ==(Point a, Point b) { return Math.Abs(a.x - b.x) < EPS && Math.Abs(a.y - b.y) < EPS; }
        public static bool operator !=(Point a, Point b) { return Math.Abs(a.x - b.x) >= EPS || Math.Abs(a.y - b.y) >= EPS; }

        public override bool Equals(object p){  return Math.Abs(x - ((Point)p).x) < EPS && Math.Abs(y - ((Point)p).y) < EPS; }
        public override int GetHashCode(){ return x.GetHashCode() ^ y.GetHashCode(); }

        public int CCW(Point b)
        {
            if (Cross(b) > EPS) return 1;
            if (Cross(b) < -EPS) return -1;
            if (Dot(b) < -EPS) return 2;
            if (Norm < b.Norm) return -2;
            return 0;
        }
        public int Contains(Polygon g)
        {
            int n = g.Count;
            bool x = false;
            for (int i = 0; i < n; i++)
            {
                Point a = g[i] - this, b = g[(i + 1) % n] - this;
                if (Math.Abs(a.Cross(b)) < EPS && a.Dot(b) < EPS) return 1;
                if(a.y>b.y)
                {
                    var t = a;
                    a = b;
                    b = t;
                }
                if (a.y < EPS && EPS < b.y && a.Cross(b) > EPS) x = !x;
            }
            return (x ? 2 : 0);
        }
    }
    /*struct Segment
    {
        public Point p1, p2;
        public Segment(Point p1, Point p2)
        {
            this.p1 = p1;
            this.p2 = p2;
        }
        public Point Projection(Point p)
        {
            Point b = p2 - p1;
            double r = b.Dot(p - p1) / b.Norm;
            return p1 + b * r;
        }
        public Point Reflection(Point p)
        {
            return p + (Projection(p) - p) * 2;
        }
        public double GetD_LP(Point p)
        {
            return Math.Abs((p - p1).Cross(p2 - p1) / (p2 - p1).Abs);
        }
        public double GetD_SP(Point p)
        {
            if ((p - p1).Dot(p2 - p1) < 0) return (p - p1).Abs;
            if ((p - p2).Dot(p1 - p2) < 0) return (p - p2).Abs;
            return GetD_LP(p);
        }
        public bool Intersect(Segment s)
        {
            return (p2 - p1).CCW(s.p1 - p1) * (p2 - p1).CCW(s.p2 - p1) <= 0 &&
                (s.p2 - s.p1).CCW(p1 - s.p1) * (s.p2 - s.p1).CCW(p2 - s.p1) <= 0;
        }
        public double GetDistance(Segment s)
        {
            if (this.Intersect(s)) return 0;
            return Math.Min(Math.Min(GetD_SP(s.p1), GetD_SP(s.p2)), Math.Min(s.GetD_SP(p1), s.GetD_SP(p2)));
        }
        public Point GetCrossPoint(Segment s)
        {
            Point b = s.p2 - s.p1;
            double d1 = Math.Abs(b.Cross(p1 - s.p1));
            double d2 = Math.Abs(b.Cross(p2 - s.p1));
            double t = d1 / (d1 + d2);
            return p1 + (p2 - p1) * t;
        }
    }
    struct Circle
    {
        public Point c; double r;
        public Circle(Point c, double r)
        {
            this.c = c;
            this.r = r;
        }
        public bool Intersect(Segment l)
        {
            return l.GetD_LP(c) <= r;
        }
        public P_Pair GetCrossPoints(Segment l)
        {
            Point pr = l.Projection(c);
            Point e = (l.p2 - l.p1) / (l.p2 - l.p1).Abs;
            double b = Math.Sqrt(r * r - (pr - c).Norm);
            return new P_Pair(pr + e * b, pr - e * b);
        }
        public P_Pair GetCrossPoints(Circle c2)
        {
            double d = (c - c2.c).Abs;
            double a = Math.Acos((r * r + d * d - c2.r * c2.r) / (2 * r * d));
            double t = (c2.c - c).Arg;
            Point p1 = c + new Point(Math.Cos(t + a) * r, Math.Sin(t + a) * r);
            Point p2 = c + new Point(Math.Cos(t - a) * r, Math.Sin(t - a) * r);
            return new P_Pair(p1, p2);
        }
    }*/
}