package lista1

object main {

  def main(args: Array[String]) {
    print("Hello, world!")
    val list = List(1, 2, 3)
    val list2 = List(3, 4, 5, 3, 5, 3, 6, 3)
    val listArg = List(list, list2)
    println()
    println(listArg)
    println()
    println(flattenl(listArg))
    println()
    println(count(3, list2))
    println()
    println(duplicate("a", 3))
  }

  def flattenl(list: List[Any]): List[Any] = list match {
    case (head: List[_]) :: Nil => head
    case (head: List[_]) :: tail => head ::: flattenl(tail)
    case Nil => Nil
  }

  def count(element: Any, list: List[Any]): Int = list match {
    case Nil => 0
    case head :: tail => head match {
      case `element` => 1 + count(element, tail)
      case _ => count(element, tail)
    }

  }

  def duplicate(x: Any, n: Int): List[Any] = n match{
    case 0 => Nil
    case _ => x::duplicate(x, n-1)
  }



}