grocery.cpp

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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Christian Schulte <schulte@gecode.org>
 *
 *  Copyright:
 *     Christian Schulte, 2001
 *
 *  Last modified:
 *     $Date: 2010-10-07 11:52:01 +0200 (Thu, 07 Oct 2010) $ by $Author: schulte $
 *     $Revision: 11473 $
 *
 *  This file is part of Gecode, the generic constraint
 *  development environment:
 *     http://www.gecode.org
 *
 *  Permission is hereby granted, free of charge, to any person obtaining
 *  a copy of this software and associated documentation files (the
 *  "Software"), to deal in the Software without restriction, including
 *  without limitation the rights to use, copy, modify, merge, publish,
 *  distribute, sublicense, and/or sell copies of the Software, and to
 *  permit persons to whom the Software is furnished to do so, subject to
 *  the following conditions:
 *
 *  The above copyright notice and this permission notice shall be
 *  included in all copies or substantial portions of the Software.
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 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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 */

#include <gecode/driver.hh>
#include <gecode/int.hh>
#include <gecode/minimodel.hh>

using namespace Gecode;

class Grocery : public Script {
protected:
  IntVarArray abcd;
  static const int s = 711;
  static const int p = 711 * 100 * 100 * 100;
public:
  Grocery(const Options& opt) : abcd(*this,4,0,s) {
    IntVar a(abcd[0]), b(abcd[1]), c(abcd[2]), d(abcd[3]);

    // The sum of all variables is s
    rel(*this, a+b+c+d == s, opt.icl());

    // The product of all variables is s (corrected by scale factor)
    rel(*this, (a*b)*(c*d) == p, opt.icl());

    // Break symmetries: order the variables
    rel(*this, abcd, IRT_LQ);

    branch(*this, abcd, INT_VAR_NONE, INT_VAL_SPLIT_MAX);
  }

  Grocery(bool share, Grocery& s) : Script(share,s) {
    abcd.update(*this, share, s.abcd);
  }

  virtual Space*
  copy(bool share) {
    return new Grocery(share,*this);
  }

  virtual void
  print(std::ostream& os) const {
    os << "\t" << abcd << std::endl;
  }
};

int
main(int argc, char* argv[]) {
  Options opt("Grocery");
  opt.iterations(20);
  opt.parse(argc,argv);
  Script::run<Grocery,DFS,Options>(opt);
  return 0;
}

// STATISTICS: example-any