func ordered(db *db.DB, a *assignment.Assignment) (l *cnf.Lit) {
// find the first in-order unassigned literal
for i := uint(1); i <= a.Len(); i++ {
if p, _ := a.Get(i); p == guess.Unassigned {
return &cnf.Lit{i, cnf.Pos}
}
}
return &cnf.Lit{0, 0}
}
func random(db *db.DB, a *assignment.Assignment) (l *cnf.Lit) {
sign := byte((rand.Int() % 2) + 1)
val := uint((rand.Int() % int(a.Len())) + 1)
for i := val; i <= a.Len(); i++ {
if v, _ := a.Get(i); v == guess.Unassigned {
return &cnf.Lit{i, sign}
}
}
for i := uint(1); i < val; i++ {
if v, _ := a.Get(i); v == guess.Unassigned {
return &cnf.Lit{i, sign}
}
}
return &cnf.Lit{0, 0}
}