using System;

using System.Collections.Generic;

​

public interface IComponent

{

    void Render();

}

​

public class Shape: IComponent

{

    public void Render()

    {

        Console.WriteLine("Render Shape");

    }

}

​

public class Group: IComponent

{

    private List<IComponent> components = new List<IComponent>();

    public void Add(IComponent component)

    {

        components.Add(component);

    }

    public void Render()

    {

        foreach(var component in components)

        {

            component.Render();

        }

    }

}

​

public class Program

{

    public static void Main()

    {

        var group1 = new Group();

        group1.Add(new Shape());

        group1.Add(new Shape());

        var group2 = new Group();

        group2.Add(new Shape());

        group2.Add(new Shape());

        var group = new Group();

        group.Add(group1);

        group.Add(group2);

        group.Render();

    }

}