Сортировка массива по алгоритму Shell

Оформил: DeeCo

{ 
 The following procedure sorts an Array with the 
 fast Shell-Sort algorithm. 
 Invented by Donald Shell in 1959, 
 the shell sort is the most efficient of the O(n2) 
 class of sorting algorithms 
}

 { 
 Die folgende Prozedur Sortiert ein Array mit 
 dem schnellem Shell-Sort Algorithmus. 
}

 Procedure Sort_Shell(var a: array of Word);
 var
   bis, i, j, k: LongInt;
   h: Word;
 begin
   bis := High(a);
   k := bis shr 1;// div 2 
  while k > 0 do
   begin
     for i := 0 to bis - k do
     begin
       j := i;
       while (j >= 0) and (a[j] > a[j + k]) do
       begin
         h := a[j];
         a[j] := a[j + k];
         a[j + k] := h;
         if j > k then
           Dec(j, k)
         else
           j := 0;
       end; // {end while] 
    end; // { end for} 
    k := k shr 1; // div 2 
  end;  // {end while} 

end;