class Multithreading
{
    public void DataFillFull(int[] arr, ConcurrentBag cBag)
    {
        int fullen = arr.Length;
        for (int i = 0; i < fullen; i++)
        {
            cBag.Add(arr[i]);
        }
    }
    public void DataFill(int[] arr, ConcurrentBag cBag, bool ascending)
    {
        int fullen = arr.Length;
        int halfLen = fullen / 2;
        if (ascending)
        {
            for (int i = 0; i < halfLen; i++)
            {
                cBag.Add(arr[i]);
            }
        }
        else
        {
            for (int i = fullen; i > halfLen; i--)
            {
                cBag.Add(arr[i - 1]);
            }
        }
    }
    public void Main(string[] args)
    {
        /* Measure */
        string input;
        long mSeconds = 0;
        float average = 0;
        int repeats = 0;
        Stopwatch stopwatch = new Stopwatch();

        begin:
        int[] ints = new int[9000000];
        for (int i = 0; i < 9000000; i++)
        {
            ints[i] = i;
        }
        ConcurrentBag cBag = new ConcurrentBag();
        stopwatch.Start();

        // Multithreading
        Task t1 = Task.Factory.StartNew(() => DataFill(ints, cBag, true));
        Task t2 = Task.Factory.StartNew(() => DataFill(ints, cBag, false));
        Task.WaitAll(t1, t2);

        // Singlethreading
        //DataFillFull(ints, cBag);

        stopwatch.Stop();

        Console.WriteLine("Repeat? y/anykey");
        input = Console.ReadLine();
        if (input == "y")
        {
            repeats++;
            mSeconds += stopwatch.ElapsedMilliseconds;
            average = mSeconds / repeats;
            Console.WriteLine(stopwatch.ElapsedMilliseconds);
            Console.WriteLine($"For {repeats} repeats, average time is {average} miliseconds.");
            stopwatch.Reset();
            goto begin;
        }
        else
        {
            Console.WriteLine();
            repeats++;
            mSeconds += stopwatch.ElapsedMilliseconds;
            average = mSeconds / repeats;
            Console.WriteLine(stopwatch.ElapsedMilliseconds);
            Console.WriteLine($"For {repeats} repeats, average time is {average} miliseconds.");
            Console.ReadKey();
            Environment.Exit(0);
        }
    }
}