notyy · March 3, 2012 15:21
diff --git a/gistfile1.scala b/gistfile1.scala
 def perm[T](ls: List[T]): List[List[T]] = ls match {  
  case Nil => List[Nil]
  case xs  => for{
    (x,i) <- ls.zipWithIndex
    (leftX,rightX) = xs.splitAt(i)
    ys <- perm(leftX ++ rightX.tail)
  } yield (x:: ys)
 }
	def perm[T](ls: List[T]): List[List[T]] = ls match {
	case Nil => List[Nil]
	case xs => for{
	(x,i) <- ls.zipWithIndex
	(leftX,rightX) = xs.splitAt(i)
	ys <- perm(leftX ++ rightX.tail)
	} yield (x:: ys)
	}