Edited

	using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
        }
    }
}
class polynomial
{ public polynomial()
  public override string ToString()
  {
     string s = .ToString();
     return ;
  }
        public static polynomial  operator -(polynomial  , polynomial)
        {
            return new polynomial( - );
        }
      public readonly int x, y;

    public TwoDPoint(int x, int y)  //constructor
    {
        this.x = x;
        this.y = y;
    }

    public override bool Equals(System.Object obj)
    {
      if (obj == null)
        {
            return false;
        }

        TwoDPoint p = obj as TwoDPoint;
        if ((System.Object)p == null)
        {
            return false;
        }

        return (x == p.x) && (y == p.y);
    }

    public bool Equals(TwoDPoint p)
    {
        if ((object)p == null)
        {
            return false;
        }

       return (x == p.x) && (y == p.y);
    }

    public override int GetHashCode()
    {
        return  ;
    }
}

}
}