figure an example of shellsort sixteen items are sorted in four passes the first pass sorts sublists of size and increment the second pass sorts sublists of size and increment the third pass sorts sublists of size and increment the fourth pass sorts list of size and increment ( regular insertion sortstatic void sort( [afor (int = length/ > /= /for each increment for (int = <ij++/sort each sublist inssort (aji)inssort ( )/could call regular inssort here /modified version of insertion sort for varying increments static void inssort ( [aint startint incrfor (int =start+incri< lengthi+=incrfor (int = ( >=incr)&( [jcompareto( [ -incr])< ) -=incrdsutil swap(ajj-incr)shellsort will work correctly regardless of the size of the incrementsprovided that the final pass has increment ( provided the final pass is regular insertion sortif shellsort will aways conclude with regular insertion sortthen how can it be any improvement on insertion sortthe expectation is that each of the (relatively cheapsublist sorts will make the list "more sortedthan it was before it is not necessarily the case that this will be truebut it is almost always true in practice when the final insertion sort is conductedthe list should be "almost sorted,yielding relatively cheap final insertion sort pass