using System;

using System.Diagnostics;                   

public class Program

{

        public static Stopwatch TimedFor(Action action, Int32 loops)

        {

            var sw = new Stopwatch();

            sw.Start();

            for (int i = 0; i < loops; ++i)

            {

                action.Invoke();

            }

            sw.Stop();

            return sw;

        }

​

        private static void BoulalMethod()

        {

            int n = 15;

            String result = "";

            for (int i = 1; i < n; i++)

            {

                for (int j = n; j > i; j--)

                    result = result + " ";

​

                for (int j = 0; j < i * 2 - 1; j++)

                    result = result + "*";

​

                result = result + Environment.NewLine;

​

            }

​

        }

        private static void HichamMethod()

        {

            int n = 15;

            String result = "";

            for (int i = 0; i < n; i++)

            {

                result = result + new string(' ', n - 1 - i);

                for (int j = 0; j < i + i - 2; j++)

                    result = result + "*";

                result = result + Environment.NewLine;

            }

        }

        public static void Main(string[] args)

        {

            var sw = TimedFor(BoulalMethod, 10000);

            var sw2 = TimedFor(HichamMethod, 10000);

            Console.WriteLine("Time taken BOULAL: {0}ms", sw.Elapsed.TotalMilliseconds);

            Console.WriteLine("Time taken BOUCHIKHI: {0}ms", sw2.Elapsed.TotalMilliseconds);

            Console.ReadKey();

​

        }

}