func (i IterativeSolver) Solve(s satproblem.SATInstance, w satproblem.Watchlist, ass []int, d int, verbose bool) [][]int {
n := len(s.Vars)
state := make([]int, n)
var ret [][]int
for true {
if d == n {
assCopy := make([]int, len(ass))
copy(assCopy, ass)
ret = append(ret, assCopy)
d -= 1
continue
}
tried := false
for a := range []int{0, 1} {
if (state[d]>>uint(a))&1 == 0 {
if verbose {
fmt.Printf("Trying %v = %v\n", s.Vars[d], a)
}
tried = true
state[d] |= 1 << uint(a)
ass[d] = a
if !w.Update(s, (d<<1)|a, ass, verbose) {
ass[d] = satproblem.NONE
} else {
d += 1
break
}
}
}
if !tried {
if d == 0 {
return ret
} else {
state[d] = 0
ass[d] = satproblem.NONE
d -= 1
}
}
}
return ret
}
func (r RecursiveSolver) Solve(s satproblem.SATInstance, w satproblem.Watchlist, ass []int, d int, verbose bool) [][]int {
if d == len(s.Vars) {
ret := make([]int, len(ass))
copy(ret, ass)
return [][]int{ret}
}
var ret [][]int
for a := range []int{0, 1} {
if verbose {
fmt.Printf("Trying %v = %v\n", s.Vars[d], a)
}
ass[d] = a
if w.Update(s, (d<<1)|a, ass, verbose) {
ret = append(ret, r.Solve(s, w, ass, d+1, verbose)...)
}
}
ass[d] = satproblem.NONE
return ret
}