using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var numbers = new List<int>{1,4,1,3,4,1,4,5,5,1,1,5,5,5,6,8,9,7,33,4,4,69,4,1,3,4,1,4,5,5,1,1,5,5,5,6,8,9,7,33,4,4,69,4,1,3,4,1,4,5,5,1,1,5,5,5,6,8,9,7,33,4,4,69,4,1,3,4,1,4,5,5,1,1,5,5,5,6,8,9,7,33,4,4,69,4,1,3,4,1,4,5,5,1,1,5,5,5,6,8,9,7,33,4,4,69,4,1,3,4,1,4,5,5,1,1,5,5,5,6,8,9,7,33,4,4,69,4,1,3,4,1,4,5,5,1,1,5,5,5,6,8,9,7,33,4,4,69,4,1,3,4,1,4,5,5,1,1,5,5,5,6,8,9,7,33,4,4,69,4,1,3,4,1,4,5,5,1,1,5,5,5,6,8,9,7,33,4,4,69,4,1,3,4,1,4,5,5,1,1,5,5,5,6,8,9,7,33,4,4,69,4,1,3,4,1,4,5,5,1,1,5,5,5,6,8,9,7,33,4,4,69};

        var watch = System.Diagnostics.Stopwatch.StartNew();

        for(int j = 0; j < 100000000; j++){

            numbers.GroupBy(i=>i).Select(grp=> new{Number = grp.Key, Total = grp.Count()});

        }

        watch.Stop();

        var elapsedMs = watch.ElapsedMilliseconds;

        Console.WriteLine(elapsedMs);

        var watch2 = System.Diagnostics.Stopwatch.StartNew();

        for(int j = 0; j < 100000000; j++){

            numbers.GroupBy(i => i, i => i, (keys, numbersGrouped) => new{Number = numbersGrouped.FirstOrDefault(), Total = numbersGrouped.Count()});

        }

        watch.Stop();

        var elapsedMs2 = watch2.ElapsedMilliseconds;

        Console.WriteLine(elapsedMs2);

    }

}