grocery.cc

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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: 2008-01-31 21:06:01 +0100 (Thu, 31 Jan 2008) $ by $Author: schulte $
 *     $Revision: 6024 $
 *
 *  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
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#include "examples/support.hh"
#include "gecode/minimodel.hh"

class Grocery : public Example {
protected:
  IntVarArray x;
  static const int s = 711;
public:
  Grocery(const Options&) : x(this,4,0,s) {

    // The sum of all variables is s
    post(this, x[0]+x[1]+x[2]+x[3] == s);

    // The product of all variables is s (corrected by scale factor)
    rel(this, mult(this, mult(this, x[0], x[1]), mult(this, x[2], x[3])), 
        IRT_EQ, s*100*100*100);

    // Break symmetries: order the variables
    rel(this, x[0], IRT_LQ, x[1]);
    rel(this, x[1], IRT_LQ, x[2]);
    rel(this, x[2], IRT_LQ, x[3]);

    branch(this, x, INT_VAR_SIZE_MIN, INT_VAL_SPLIT_MAX);
  }

  Grocery(bool share, Grocery& s) : Example(share,s) {
    x.update(this, share, s.x);
  }

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

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

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

// STATISTICS: example-any