using System;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine(Vector2.One.DistanceFrom(Vector2.Zero));

    }

}

​

public class Game

{

    public Game()

    {

    }

}

​

public class Scene

{

    public List<TileLayer> Layers = new List<TileLayer>();

    public List<Entity> Entities = new List<Entity>();

    public Scene()

    {

    }

}

​

public class TileLayer

{

    private char[,] tiles;

    public TileLayer(int width, int height)

    {

        tiles = new char[width, height];

    }

}

​

public class Entity

{

    public List<char> BlackListedTiles = new List<char>();

    public Vector2 Position;

    public char Tile;

    public Entity()

    {

    }

}

​

public class Vector2

{

    public int X {get; set;}

    public int Y {get; set;}

    public Vector2(int x, int y)

    {

        X = x;

        Y = y;

    }

    public float DistanceFrom(Vector2 right)

    {

        var xTotal = right.X + X;

        var yTotal = right.Y + Y;

        var xSquared = Math.Pow(xTotal, 2);

        var ySquared = Math.Pow(yTotal, 2);

        return (float)Math.Sqrt(xSquared + ySquared);

    }

    public static Vector2 Zero = new Vector2(0,0);

    public static Vector2 One = new Vector2(1,1);

}