object Demo
{
  def main(args : Array[String])
  {
    var a = Set(1, 1, 2, 3, 4); // 1, 2, 3, 4
    var b = Set(4, 6, 7, 8, 8);
    println(a)

    println(a.head) // head
    println(a.tail) // tail

    println(a ++ b) // 5 1 6 2 7 3 8 4

    println(a+10) // add an element to set
    println(a-1) // remove an element from set

    println(a.apply(1)) // check if set contains a specific element

    // intersect
    println(a.&(b))
    println(a.intersect(b))
    // unit
    println(a.union(b))
    // difference
    println(a.&~(b))

    // foreach
    a.foreach(println(_))
    // max
    println(a.max)
    // min
    println(a.min)
    // mkString
    println(a.mkString(" "))
  }
}
		

import scala.collection.mutable.{Set => mSet}
object Demo
{
  def main(args : Array[String])
  {
    var a = mSet(1, 1, 2, 3, 4); // 1, 2, 3, 4
    var b = mSet(4, 6, 7, 8, 8);

    // intersect
    println(a.&(b))
    println(a.intersect(b))
    // unit
    println(a.union(b))
    // difference
    println(a.&~(b))
  }
}
		

import scala.collection.immutable.SortedSet
object Demo
{
  def main(args : Array[String])
  {
    var a = SortedSet(1, 1, 4, 3, 2);
    var b = SortedSet(4, 6, 7, 8, 8);

    var c = a.toArray
    println(c(1))

    // intersect
    println(a.&(b))
    println(a.intersect(b))
    // unit
    println(a.union(b))
    // difference
    println(a.&~(b))
  }
}