object Main extends App {
  implicit class OrderedList[T <% Ordered[T]](list: List[T]) {
    def sorti = list.zipWithIndex.sorted.map(_._2)
  }
  def f[T <% Ordered[T]](list: List[T]) = list.sorti.sorti
  def g[T <% Ordered[T]](list: List[T]) = println(f(list).mkString("[", ", ", "]"))
  g(List(1,100,10,10000,1000))
  g(List(3,1,4,1,5,9,2))
  g(List(0,1,0,1,0,1,0,1))
  g(List("A","C","B","E","D"))
  import java.time.Month
  g(List(Month.MARCH, Month.JANUARY, Month.APRIL, Month.JANUARY, Month.MAY, Month.SEPTEMBER, Month.FEBRUARY))
}
 

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