object Zad1 extends App {

  def subSeq[A](seq: Seq[A], begIdx: Int, endIdx: Int): Seq[A] = seq.drop(begIdx).take(endIdx-begIdx+1)

  print(s"${subSeq(Seq(2, 3, 4, 5, 6, 7, 8, 9, 10), 1, 4)}")
}


// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

object Zad2 extends App {

  def remElem[A](seq: Seq[A], k: Int): Seq[A] = {
    seq.zipWithIndex.filter{ case (element, index) => index != k }.map(_._1)
  }

  println(remElem(Seq(1, 2, 3, 4, 5), 2))
}


// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

object Zad4 extends App {

  def freq[A](seq: Seq[A]): Seq[(A, Int)] = seq.groupBy(identity).view.mapValues(_.size).toSeq

  print(s"${freq(Seq('a','b','a','c','c','a'))}")

}

// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

object Zad5 extends App {
  def destutter[A](seq: Seq[A]): Seq[A] =
    seq.foldLeft(Seq[A]()) {
      case (s, e) if (s.isEmpty || s.last != e) => s :+ e
      case (s, e)                               => s
    }
  println(destutter(Seq(1, 1, 2, 4, 4, 4, 1, 3)))

}


// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

object Zad6 extends App {

  def diff[A](seq1: Seq[A], seq2: Seq[A]): Seq[A] = seq1.zip(seq2).filter{ case (s1, s2) => s1 != s2 }.map(_._1)

  println(diff(Seq(1, 2, 3),Seq(2, 2, 1, 3)))
}


// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%