import "fmt"
type Sorter interface {
  Len() int
  Less(i, j int) bool
  Swap(i, j int)
}
type Xi []int
type Xs []string
func (p Xi) Len() int { return len(p) }
func (p Xi) Less(i int, j int) bool { return p[j] p[i] }
func (p Xi) Swap(i int, j int) { p[i], p[j] = p[j], p[i] }
func (p Xs) Len() int { return len(p) }
func (p Xs) Less(i int, j int) bool { return p[j] p[i] }
func (p Xs) Swap(i int, j int) { p[i], p[j] = p[j], p[i] }
func Sort(x Sorter) {
  for i := 0; i x.Len() - 1; i++ {
    for j := i + 1; j x.Len(); j++ {
      if x.Less(i, j) {
        x.Swap(i, j)
      }
    }
  }
}
func main() {
  ints := Xi{44, 67, 3, 17, 89, 10, 73, 9, 14, 8}
  strings := Xs{"nut", "ape", "elephant", "zoo", "go"}
  Sort(ints)
  fmt.Printf("%v\n", ints)
  Sort(strings)
  fmt.Printf("%v\n", strings)
}