Smallest Pandigital

pandigit.scala

object App {
  def main(args: Array[String]){
    val res = for(i <- 123 to 987 if isPanDigital(split(i));
                  k <- 1000-i to 987 
                  if isPanDigital(split(i)++split(k)++split(i+k)))yield((i,k))
    println(res)
  }

  def isPanDigital(ls: List[Int]) = {
    ls.size == ls.toSet.size
  }

  def split(n: Int) = if(n==0) List(0) else{
    (Stream.iterate(n)(_/10)takeWhile(_!=0)map(_%10)toList)reverse
  }
  
}