using System;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {   

        var rect1 = new Rectangle {Length = 10, Width = 20};

        var rect2 = new Rectangle {Length = 100, Width = 200};

        Console.WriteLine(rect1.CompareTo(rect2));

    }

}

​

class Polygon

{

    public double Length{get; protected set;}

    public double Width {get; protected set;}

    public virtual double GetArea()

    {

        return 0;

    }

    public void changePolygonLength(double newLength)

    {

        Length = newLength;

    }

    public virtual void Draw()

    {

        Console.WriteLine("Drawing: Polygon");

    }   

}

​

class Rectangle: Polygon, IComparable

{

    public new double Length {get; set;}

    public new double Width {get; set;}

    /*

    public Rectangle (double length, double width)

    {

        Length = @length; 

        Width = width;

    }

    */

    public override void Draw()

    {

        Console.WriteLine("Drawing: Rectangle");

    }

    public new double GetArea()

    {

        return Length * Width;

    }

    public int CompareTo(Object obj)

    {

        if (obj == null)

        {

            return 1;

        }

        if (!(obj is Rectangle))

        {

            throw new ArgumentException();

        }

        Rectangle target = (Rectangle)obj;

        double diff = this.GetArea() - target.GetArea();

        if (diff == 0)

        {

            return 0;

        }

        else if (diff > 0)

        {

            return 1;

        }

        else return -1;

    }

}

​

class Triangle: Polygon

{

​

    public Triangle(double @base, double height)

    {

        Length = @base; 

        Width = height;

    }

    public override double GetArea()

    {

        return 0.5 * Length * Width;

    }

    public override void Draw()

    {

        Console.WriteLine("Drawing: Triangle");

    }

}

public interface ILoveYou

{

    string Lover {get;set;}

    string Loved {get;set;}

}

​

class Yvonne: ILoveYou

{

    string ILoveYou.Lover{get; set;}

    string ILoveYou.Loved{get; set;}

}

​

​