all-interval.cpp

Go to the documentation of this file.

/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Christian Schulte <schulte@gecode.org>
 *
 *  Copyright:
 *     Christian Schulte, 2006
 *
 *  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.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */

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

#include <cstdlib>

using namespace Gecode;

class AllInterval : public Script {
private:
  IntVarArray x;
  IntVarArray d;
public:
  AllInterval(const SizeOptions& opt) :
    Script(opt),
    x(*this, opt.size(), 0, opt.size()-1),
    d(*this, opt.size()-1, 1, opt.size()-1) {
    const int n = x.size();

    // Set up variables for distance
    for (int i=0; i<n-1; i++)
      rel(*this, d[i] == abs(x[i+1]-x[i]), opt.ipl());

    distinct(*this, x, opt.ipl());
    distinct(*this, d, opt.ipl());

    // Break mirror symmetry
    rel(*this, x[0], IRT_LE, x[1]);
    // Break symmetry of dual solution
    rel(*this, d[0], IRT_GR, d[n-2]);

    branch(*this, x, INT_VAR_SIZE_MIN(), INT_VAL_SPLIT_MIN());
  }
  AllInterval(AllInterval& s)
    : Script(s) {
    x.update(*this, s.x);
    d.update(*this, s.d);
  }
  virtual Space*
  copy(void) {
    return new AllInterval(*this);
  }
  virtual void
  print(std::ostream& os) const {
    const int n = x.size();
    os << "\tx[" << n << "] = {";
    for (int i = 0; i < n-1; i++)
      os << x[i] << "(" << d[i] << "),";
    os << x[n-1] << "}" << std::endl;
  }
};


int
main(int argc, char* argv[]){
  SizeOptions opt("AllInterval");
  opt.size(1000);
  opt.iterations(5);
  opt.ipl(IPL_BND);
  opt.parse(argc, argv);
  if (opt.size() < 2) {
    std::cerr << "size must be at least 2!" << std::endl;
    return -1;
  }
  Script::run<AllInterval,DFS,SizeOptions>(opt);
  return 0;
}

// STATISTICS: example-any