include "fzn_sum_set.mzn";
include "fzn_sum_set_reif.mzn";

/** @group globals
  Requires that the sum of the weights \a ws[\p i1]..\a ws[\p iN] equals \a s, 
  where \a vs[\p i1]..\a vs[\p iN] are the elements appearing in set \a x
*/

predicate sum_set(array[int] of int: vs, array[int] of int: ws,
                  var set of int: x, var int: s) =
    fzn_sum_set(vs, ws, x, s);