[gecode-users] Avoid the appearance of several simultaneous values

[Christian Schulte]

Hi,

 

This is not really a Gecode-specific question but a general constraint modeling question, so you might want to turn elsewhere for help.

 

Christian

 

--

Christian Schulte, www.ict.kth.se/~cschulte

 

From: users-bounces at gecode.org [mailto:users-bounces at gecode.org] On Behalf Of inspecteur
Sent: Tuesday, December 24, 2013 03:59 PM
To: users at gecode.org
Subject: [gecode-users] Avoid the appearance of several simultaneous values

 

Hi
Sorry for my english, I'm french and beginner on gecode.

I want to create an array of integers (4 * 4) with the constraints:
1) Possible values​​ between 1 and 6
2) no repeating values ​​on lines
3) The values ​​3 and 4 must not be on the same line
4) No more than 2 times the same value on each column

I stumble on the constraint number 3)



If someone could put me on the track



Here is my code

class CarreMagique : public Script {
private:
  const int n;
  IntVarArray carreMag;
 
  public:
  CarreMagique(const SizeOptions& opt)
    : n(opt.size()), carreMag(*this,n*4,1,6) {

    Matrix<IntVarArray> tab(carreMag, n, 4);
    IntVarArgs d1(4);
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < 4; j++) {
                d1[j]=tab(i,j);
            }
            distinct(*this, d1);   
        }
        
  IntVarArgs d2(n);
        for (int j = 0; j < 4; j++) {
            for (int i = 0; i < n; i++) {
                d2[i]=tab(i,j);
            }
            count(*this, d2, IntSet(0,2), IntArgs::create(6,1,1));
        }

    }
    branch(*this, carreMag, INT_VAR_NONE(), INT_VAL_SPLIT_MIN());
  }

  CarreMagique(bool share, CarreMagique& s) : Script(share,s), n(s.n) {
    carreMag.update(*this, share, s.carreMag);
  }

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

  virtual void print(std::ostream& os) const {
    // Pour acceder au tableau comme à une matrice
    Matrix<IntVarArray> m(carreMag, n, 4);
    for (int i = 0; i < n; i++) {
      os << "\t";
      for (int j = 0; j < 4; j++) {
        os.width(2);
        os << m(i,j) << "  ";
      }
      os << std::endl;
    }
  }

};

int main(int argc, char* argv[]) {
  SizeOptions opt("CarreMagique");
  opt.size(4);
  Script::run<CarreMagique,DFS,SizeOptions>(opt);
  return 0;
}



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