Main.scala

import scala.io.Source;

object Main {

  def main(args: Array[String]): Unit = {
    val lines = Source.fromFile("input.txt").getLines
    val ids = lines.map(x=> Integer.parseInt(transform(x), 2) )
    val seatIds = ids.toList.sorted
    val highest = seatIds.last

    val seat = seatIds.sliding(2).toList.filter(xs => xs(1) - xs(0) == 2).head(0) + 1

    println (highest)
    println (seat)
  }

  def transform(seat : String) : String = {
    seat map charToNum
  }

  def charToNum(c: Char) : Char = {
    c match {
      case 'B' => '1'
      case 'R' => '1'
      case _ => '0'
    }
  }
}