update vendor

vendor/github.com/crillab/gophersat/solver/solver.go

@@ -127,6 +127,25 @@ func New(problem *Problem) *Solver {
 	return s
 }
 
+// newVar is used to indicate a new variable must be added to the solver.
+// This can be used when new clauses are appended and these clauses contain vars that were unseen so far.
+// If the var already existed, nothing will happen.
+func (s *Solver) newVar(v Var) {
+	if cnfVar := int(v.Int()); cnfVar > s.nbVars {
+		// If the var already existed, do nothing
+		for i := s.nbVars; i < cnfVar; i++ {
+			s.model = append(s.model, 0)
+			s.activity = append(s.activity, 0.)
+			s.polarity = append(s.polarity, false)
+			s.reason = append(s.reason, nil)
+			s.trailBuf = append(s.trailBuf, 0)
+		}
+		s.varQueue = newQueue(s.activity)
+		s.addVarWatcherList(v)
+		s.nbVars = cnfVar
+	}
+}
+
 // sets initial activity for optimization variables, if any.
 func (s *Solver) initOptimActivity() {
 	for i, lit := range s.minLits {
@@ -682,6 +701,7 @@ func (s *Solver) AppendClause(clause *Clause) {
 	i := 0
 	for i < clause.Len() {
 		lit := clause.Get(i)
+		s.newVar(lit.Var())
 		switch s.litStatus(lit) {
 		case Sat:
 			w := clause.Weight(i)

vendor/github.com/crillab/gophersat/solver/types.go

@@ -71,6 +71,11 @@ func (v Var) Lit() Lit {
 	return Lit(v * 2)
 }
 
+// Int converts a Var to a CNF variable.
+func (v Var) Int() int32 {
+	return int32(v + 1)
+}
+
 // SignedLit returns the Lit associated to v, negated if 'signed', positive else.
 func (v Var) SignedLit(signed bool) Lit {
 	if signed {

vendor/github.com/crillab/gophersat/solver/watcher.go

@@ -39,6 +39,16 @@ func (s *Solver) initWatcherList(clauses []*Clause) {
 	}
 }
 
+// Should be called when new vars are added to the problem (see Solver.newVar)
+func (s *Solver) addVarWatcherList(v Var) {
+	cnfVar := int(v.Int())
+	for i := s.nbVars; i < cnfVar; i++ {
+		s.wl.wlistBin = append(s.wl.wlistBin, nil, nil)
+		s.wl.wlist = append(s.wl.wlist, nil, nil)
+		s.wl.wlistPb = append(s.wl.wlistPb, nil, nil)
+	}
+}
+
 // appendClause appends the clause without checking whether the clause is already satisfiable, unit, or unsatisfiable.
 // To perform those checks, call s.AppendClause.
 // clause is supposed to be a problem clause, not a learned one.