domino.cc

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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Guido Tack <tack@gecode.org>
 *     Mikael Lagerkvist <lagerkvist@gecode.org>
 *
 *  Copyright:
 *     Guido Tack, 2006
 *     Mikael Lagerkvist, 2006
 *
 *  Last modified:
 *     $Date: 2008-08-21 15:20:13 +0200 (Thu, 21 Aug 2008) $ by $Author: schulte $
 *     $Revision: 7674 $
 *
 *  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 "examples/support.hh"
#include "gecode/minimodel.hh"

namespace {

  extern const int *specs[];
  extern const unsigned int n_examples;

}

class Domino : public Example {
private:
  const int *spec;
  int width;
  int height;
  
  IntVarArray x;

public:
  Domino(const SizeOptions& opt)
    : spec(specs[opt.size()]), 
      width(spec[0]), height(spec[1]),
      x(this, (width+1)*height, 0, 28) {
    spec+=2; // skip board size information
    
    // Copy spec information to the board
    IntArgs board((width+1)*height);
    for (int i=0; i<width; i++)
      for (int j=0; j<height; j++)
        board[j*(width+1)+i] = spec[j*width+i];    
    
    // Initialize the separator column in the board
    for (int i=0; i<height; i++) {
      board[i*(width+1)+8] = -1;
      post(this, x[i*(width+1)+8]==28);
    }

    // Variables representing the coordinates of the first
    // and second half of a domino piece
    IntVarArray p1(this, 28, 0, (width+1)*height-1);
    IntVarArray p2(this, 28, 0, (width+1)*height-1);
    

    int dominoCount = 0;
      
    int possibleDiffsA[] = {1, width+1};
    IntSet possibleDiffs(possibleDiffsA, 2);
    
    for (int i=0; i<=6; i++)
      for (int j=i; j<=6; j++) {
        
        // The two coordinates must be adjacent.
        // I.e., they may differ by 1 or by the width.
        // The separator column makes sure that a field
        // at the right border is not adjacent to the first field
        // in the next row.
        IntVar diff(this, possibleDiffs);
        abs(this, minus(this, p1[dominoCount], p2[dominoCount]),
            diff, ICL_DOM);
        
        // If the piece is symmetrical, order the locations
        if (i == j)
          rel(this, p1[dominoCount], IRT_LE, p2[dominoCount]);
        
        // Link the current piece to the board
        element(this, board, p1[dominoCount], i);
        element(this, board, p2[dominoCount], j);
        
        // Link the current piece to the array where its
        // number is stored.
        element(this, x, p1[dominoCount], dominoCount);
        element(this, x, p2[dominoCount], dominoCount);
        dominoCount++;
      }

    // Branch by piece
    IntVarArgs ps(28*2);
    for (int i=0; i<28; i++) {
      ps[2*i]   = p1[i];
      ps[2*i+1] = p2[i];
    }

    // Install branchings
    branch(this, ps, INT_VAR_NONE, INT_VAL_MIN);
  }

  virtual void
  print(std::ostream& os) {
    for (int h = 0; h < height; ++h) {
      os << "\t";
      for (int w = 0; w < width; ++w) {
        int val =  x[h*(width+1)+w].min();
        char c = val < 10 ? '0'+val : 'A' + (val-10);
        os << c;
      }
      os << std::endl;
    }
    os << std::endl;
  }
  Domino(bool share, Domino& s) :
    Example(share,s), spec(s.spec), width(s.width), height(s.height) {
      x.update(this, share, s.x);
  }
  virtual Space*
  copy(bool share) {
    return new Domino(share,*this);
  }

};


int
main(int argc, char* argv[]) {
  SizeOptions opt("Domino");
  opt.size(0);
  opt.parse(argc,argv);
  if (opt.size() >= n_examples) {
    std::cerr << "Error: size must be between 0 and "
              << n_examples-1 << std::endl;
    return 1;
  }
  Example::run<Domino,DFS,SizeOptions>(opt);
  return 0;
}


namespace {

  
  const int domino0[] =
    { // width*height of the board
      8,7,
      // the board itself
      2,1,0,3,0,4,5,5,
      6,2,0,6,3,1,4,0,
      3,2,3,6,2,5,4,3,
      5,4,5,1,1,2,1,2,
      0,0,1,5,0,5,4,4,
      4,6,2,1,3,6,6,1,
      4,2,0,6,5,3,3,6
    };
  
  const int domino1[] =
    { // width*height of the board
      8,7,
      // the board itself
      5,1,2,4,6,2,0,5,
      6,6,4,3,5,0,1,5,
      2,0,4,0,4,0,5,0,
      6,1,3,6,3,5,4,3,
      3,1,0,1,2,2,1,4,
      3,6,6,2,4,0,5,4,
      1,3,6,1,2,3,5,2
    };
  
  const int domino2[] =
    { // width*height of the board
      8,7,
      // the board itself
      4,4,5,4,0,3,6,5,
      1,6,0,1,5,3,4,1,
      2,6,2,2,5,3,6,0,
      1,3,0,6,4,4,2,3,
      3,5,5,2,4,2,2,1,
      2,1,3,3,5,6,6,1,
      5,1,6,0,0,0,4,0
    };
  
  const int domino3[] =
    { // width*height of the board
      8,7,
      // the board itself
      3,0,2,3,3,4,4,3,
      6,5,3,4,2,0,2,1,
      6,5,1,2,3,0,2,0,
      4,5,4,1,6,6,2,5,
      4,3,6,1,0,4,5,5,
      1,3,2,5,6,0,0,1,
      0,5,4,6,2,1,6,1
    };
  
  const int domino4[] =
    { // width*height of the board
      8,7,
      // the board itself
      4,1,5,2,4,4,6,2,
      2,5,6,1,4,6,0,2,
      6,5,1,1,0,1,4,3,
      6,2,1,1,3,2,0,6,
      3,6,3,3,5,5,0,5,
      3,0,1,0,0,5,4,3,
      3,2,4,5,4,2,6,0
    };
  
  const int domino5[] =
    { // width*height of the board
      8,7,
      // the board itself
      4,1,2,1,0,2,4,4,
      5,5,6,6,0,4,6,3,
      6,0,5,1,1,0,5,3,
      3,4,2,2,0,3,1,2,
      3,6,5,6,1,2,3,2,
      2,5,0,6,6,3,3,5,
      4,1,0,0,4,1,4,5
    };
  
  const int *specs[] =
    {domino0,domino1,domino2,domino3,domino4,domino5};
  const unsigned n_examples = sizeof(specs)/sizeof(int*);

}

// STATISTICS: example-any