HackerRank: List Replication

ListReplication.scala

package list.replication

object Main {
	def repeat[T](num: Int, e: T): List[T] = if (num <= 0) List[T]() else e :: repeat(num - 1, e);
	  
	def f(num: Int, arr: List[Int]): List[Int] = arr.flatMap(e => repeat(num, e));
	
	def main(args: Array[String]) {
		val lst1 = f(4, List(1, 2, 3));
		lst1.map(e => println(e))
	}
}