func lexv(alphabet string, length int) {
var (
a []uint8
)
selectors := make(chan string, 10)
counts := make(chan int)
max := int(math.Pow(float64(length+1), float64(len(alphabet))))
for i := 0; i != MAXPROCS; i++ {
go gen_selectors(alphabet, i*(max/MAXPROCS), (i+1)*(max/MAXPROCS), length, selectors, counts)
}
count, counts_rcvd, processed := 0, 0, 0
res := make([]string, 0)
for {
select {
case selector := <-selectors:
a = make([]uint8, 0)
for j := 0; j != len(selector); j++ {
for k := 0; k != int(selector[j]-'0'); k++ {
a = append(a, alphabet[len(selector)-j-1])
}
}
sort.Sort(permutable.PermChars(a))
for {
res = append(res, string(a))
if !permutable.NextPermutation(permutable.PermChars(a)) {
break
}
}
processed++
case c := <-counts:
count += c
counts_rcvd++
if counts_rcvd == MAXPROCS {
close(counts)
counts = nil
}
}
if counts_rcvd == MAXPROCS && count == processed {
close(selectors)
break
}
}
ls := LexSort{alphabet, res}
sort.Sort(ls)
ls.Print()
}
func sign(n int) {
fmt.Println(factorial(n) * (1 << uint8(n)))
a := make([]int, n)
for k := range a {
a[k] = k + 1
}
signPerm(a)
for permutable.NextPermutation(permutable.PermInts(a)) {
signPerm(a)
}
}
func Perm() {
n := 0
if _, err := fmt.Scanf("%d", &n); err != nil {
log.Fatal(err)
}
fmt.Println(factorial(n))
a := make([]int, n)
for k := range a {
a[k] = k + 1
}
printPerm(a)
for permutable.NextPermutation(permutable.PermInts(a)) {
printPerm(a)
}
}