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all-interval.cc

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/*
 *  Main authors:
 *     Christian Schulte <schulte@gecode.org>
 *
 *  Copyright:
 *     Christian Schulte, 2006
 *
 *  Last modified:
 *     $Date: 2006-08-04 16:06:52 +0200 (Fri, 04 Aug 2006) $ by $Author: schulte $
 *     $Revision: 3517 $
 *
 *  This file is part of Gecode, the generic constraint
 *  development environment:
 *     http://www.gecode.org
 *
 *  See the file "LICENSE" for information on usage and
 *  redistribution of this file, and for a
 *     DISCLAIMER OF ALL WARRANTIES.
 *
 */     

#include "examples/support.hh"
#include "gecode/minimodel.hh"

#include <cstdlib>

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

    IntVarArgs d(n-1);

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

    // Constrain them to be between 1 and n-1
    dom(this, d, 1, n-1);

    distinct(this, x, opt.icl);
    distinct(this, d, opt.icl);

    // 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, BVAR_SIZE_MIN, BVAL_SPLIT_MIN);
  }
  AllInterval(bool share, AllInterval& e)
    : Example(share, e) {
    x.update(this, share, e.x);
  }
  virtual Space*
  copy(bool share) {
    return new AllInterval(share, *this);
  }
  virtual void
  print(void) {
    const int n = x.size();
    std::cout << "\tx[" << n << "] = {";
    for (int i = 0; i < n-1; i++)
      std::cout << x[i] << "(" << abs(x[i+1].val()-x[i].val()) << "),";
    std::cout << x[n-1] << "}" << std::endl;
  }
};


int main(int argc, char** argv){
  Options opt("All-interval Series");
  opt.size       = 1000;
  opt.iterations = 5;
  opt.icl        = ICL_BND;
  opt.parse(argc, argv);
  if (opt.size < 2) {
    std::cerr << "n must be at least 2!" << std::endl;
    return -1;
  }
  Example::run<AllInterval,DFS>(opt);
  return 0;
}

// STATISTICS: example-any