using System;

using System.Collections.Generic;

​

public class Try {

    public static int[,] GridStatus = new int[100, 100];

    public static void InitGridStatus() {

        Array.Clear(GridStatus,0,GridStatus.Length);

    }

    public void GridRenderer(int x, int y) {

        GridStatus[x, y] = -1;

    }

    public static bool GridChecker(int x, int y) {

        if (GridStatus[x, y] == -1) {

            return false;

        } else {

            return true;

        }

    }

}

​

public class Program

{

    public static void Main()

    {

        Try.InitGridStatus();

        Try a = new Try();

        Try b = new Try();

        a.GridRenderer(1, 1);

        b.GridRenderer(3, 3);

        Console.WriteLine(Try.GridStatus[1,1]);

        Console.WriteLine(Try.GridStatus[3,3]);

        Console.WriteLine(Try.GridStatus[4,4]);

        Console.WriteLine(Try.GridChecker(1, 1));

        Console.WriteLine(Try.GridChecker(3, 3));

        Console.WriteLine(Try.GridChecker(4, 4));

    }

}