A Hyperheuristic for the Dial-a-Ride Problem with Time Windows

Listing 4

The pseudocode of the random permutation descent heuristic selection operator.

(1) function rpd_heuristic_selection

(2)  set   = null

(3)  if   is empty

(4)     store a random permutation of   in

(5)  end if

(6)  set   = ,   = null

(7)  for each low-level heuristic   in

(8)      =

(9)    if   >  

(10)       =

(11)    end if

(12) end for

(13) if   <=

(14)    clear

(15) end if

(16) return

(17) end function