code: public static void sort(int[] data, int start, int end, Comparator<? super DBIDRef> comp) {
      quickSort(data, start, end - 1, comp, new IntegerDBIDVar(), new IntegerDBIDVar(), new IntegerDBIDVar());
    }
docs: Sort the array using the given comparator.
  
  @param data Data to sort
  @param start First index
  @param end Last index (exclusive)
  @param comp Comparator