using System;

using System.Collections.Generic;

using System.Linq;

​

namespace ConsoleApplication2 {

    public class Program {

        public static void Main(string[] args) {

            var array = CreateArray(1000);

            Console.WriteLine(CountExecutions(() => array.CopyKrisStyle(100)) + " <- Funkcja Krisa");

            Console.WriteLine(CountExecutions(() => array.CopyExcludingIndex(100)) + " <- Funkcja Xibuka");

            Console.WriteLine(CountExecutions(() => array.CopyArrayStyle(100)) + " <- Funkcja Wrzątka");

        }

​

        static int[] CreateArray(int size) {

            var list = new List<int>();

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

                list.Add(i);

            var array = list.ToArray();

            return array;

        }

​

        static int CountExecutions(Action function) {

            var time = DateTime.Now;

            var ret = 0;

            while (DateTime.Now < time.AddSeconds(2)) {

                function.Invoke();

                ret++;

            }

            return ret;

        }

    }

    public static class WrzątekExtenszyns {

    public static T[] CopyArrayStyle<T>(this T[] array, int indexToRemove) {

        var newArray = new T[array.Length - 1];

        for (int i = 0, j = 0; i < newArray.Length; i++, j++) {

            if (i == indexToRemove)

                j++;

            newArray[i] = array[j];

        }

​

        return newArray;

    }

​

    public static T[] CopyKrisStyle<T>(this T[] array, int indexToRemove) {

        return array.Where((v, i) => i != indexToRemove).ToArray();

    }

    public static T[] CopyExcludingIndex<T>(this T[] array, int index) {

        T[] newArray = new T[array.Length - 1];

        Array.Copy(array, 0, newArray, 0, index);

        Array.Copy(array, index+ 1, newArray, index, array.Length - index - 1);

        return newArray;

    }

}

}

​

​