Сортировка шейкером

Console.WriteLine("shejker");

   for (int i = 0; i < a.Length; i++)

     { b[i] = a[i]; }

         col_sravn = 0;

         col_per = 0;

         while (l < r)                                           

    { for (int i = r; i >= l; i--)

        {

           col_sravn++;

           if (b[i - 1] > b[i])

           {  temp = b[i - 1];

              b[i - 1] = b[i];

              b[i] = temp;

              col_per++;

              k = i; }

         }

           l = k + 1;

for (int i = l; i <= r; i++)

  {

    col_sravn++;

    if (b[i - 1] > b[i])

       {  temp = b[i - 1];

          b[i - 1] = b[i];

          b[i] = temp;

          col_per++;

          k = i;

        }

   }

       r = k - 1;

     }

for (int i = 0; i < b.Length; i++)

  Console.Write("{0} ", b[i]);

  Console.WriteLine();

Console.WriteLine("kol-vosrav {0}", col_sravn);

Console.WriteLine("kol-vo perestav {0}", col_per);

Console.ReadLine();