Exemple #1
0
 /**
  * Main filtering algorithm: TODO 2) Implement filtering procedure of PropKCC (see isEntail)
  *
  * @param evtmask (useless for the exam)
  * @throws ContradictionException (when a fail occurs)
  */
 public void propagate(int evtmask) throws ContradictionException {
   for (int i = 0; i < n; i++) {
     g.getNeighborsOf(i).clear();
   }
   for (int i = 0; i < n; i++) {
     for (int j = succs[i].getLB(); j <= succs[i].getUB(); j = succs[i].nextValue(j)) {
       g.addEdge(i, j);
     }
   }
   ccf.findAllCC();
   nb.updateLowerBound(ccf.getNBCC(), aCause);
   for (int i = 0; i < n; i++) {
     g.getNeighborsOf(i).clear();
   }
   for (int i = 0; i < n; i++) {
     if (succs[i].instantiated()) {
       g.addEdge(i, succs[i].getValue());
     }
   }
   ccf.findAllCC();
   nb.updateUpperBound(ccf.getNBCC(), aCause);
 }
Exemple #2
0
 /**
  * Entailment checker
  *
  * @return ESat.FALSE if the propagator is violated ESat.TRUE if the propagator is satisfied for
  *     sure, no matter what happens next ESat.UNDEFINED otherwise
  */
 public ESat isEntailed() {
   // estimates the minimum number of cc of the solution by
   // computing cc of the graph induced by variable domains
   for (int i = 0; i < n; i++) {
     g.getNeighborsOf(i).clear();
   }
   for (int i = 0; i < n; i++) {
     for (int j = succs[i].getLB(); j <= succs[i].getUB(); j = succs[i].nextValue(j)) {
       g.addEdge(i, j);
     }
   }
   ccf.findAllCC();
   if (nb.getUB() < ccf.getNBCC()) {
     // too many CC
     return ESat.FALSE;
   }
   // estimates the maximum number of cc of the solution by
   // computing cc of the graph induced by instantiated variable values
   for (int i = 0; i < n; i++) {
     g.getNeighborsOf(i).clear();
   }
   for (int i = 0; i < n; i++) {
     if (succs[i].instantiated()) {
       g.addEdge(i, succs[i].getValue());
     }
   }
   ccf.findAllCC();
   if (nb.getLB() > ccf.getNBCC()) {
     // not enough CC
     return ESat.FALSE;
   }
   // if all variables are instantiated then this propagator is entailed
   if (isCompletelyInstantiated()) {
     return ESat.TRUE;
   } else {
     return ESat.UNDEFINED;
   }
 }