05. Game of Life

using System;
using System.Collections.Generic;

public class TestProject
{
    private static void Main()
    {
        int pairs = int.Parse(Console.ReadLine());
        int[] oldboard = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, };
        int x; int y;
        List<int> newboard = new List<int> { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

        for (int i = 0; i < pairs; i++)// minavam prez vcseki edin bit
        {
            //foreach (var row in newboard)
            //{
            //    Console.WriteLine(Convert.ToString(row, 2).PadLeft(10, '0'));
            //}
            //Console.WriteLine();
            x = int.Parse(Console.ReadLine());
            y = int.Parse(Console.ReadLine());
            oldboard[x] |= (1 << y);
            newboard[x] |= (1 << y);
        }

        for (int red = 0; red < 10; red++) // minavam prez vcseki edin bit
        {
            for (int kol = 9; kol >= 0; kol--)
            {
                int currentbit = (newboard[red] & (1 << kol)) == 0 ? 0 : 1;
                int checkedbit;
                int countones = 0;

                int startred = Math.Max(red - 1, 0); // opredelqv koi susedni bitove da proverqvam
                int endred = Math.Min(red + 1, 9);
                int startkol = Math.Max(kol - 1, 0);
                int endkol = Math.Min(kol + 1, 9);


                for (int k = startred; k <= endred; k++)
                {
                    for (int l = endkol; l >= startkol; l--)
                    {
                        if (k == red && l == kol)
                        {
                            continue;
                        }
                        checkedbit = (newboard[k] & (1 << l)) == 0 ? 0 : 1;
                        if (checkedbit == 1)
                        {
                            countones++;
                        }
                    }
                }

                if (currentbit == 1)
                {
                    if (countones < 2 || 3 < countones)
                    {
                        oldboard[red] &= ~(1 << kol);
                    }
                }
                else
                {
                    if (countones == 3)
                    {
                        oldboard[red] |= (1 << kol);
                    }
                }
            }
        }

        foreach (var row in oldboard)
        {
            Console.WriteLine(Convert.ToString(row, 2).PadLeft(10, '0'));
        }

        //Console.WriteLine(newboard[2]); //pravq proverka kolko tretoto 4islo -zero testa dava razlika samo v nego

    }
}