IoError.scala

import java.io.{File, PrintWriter}

object IoError extends App {
  def slice(stream: String): List[String] = {
    (for (i <- 0 until (stream.length / 8)) yield {
      stream.substring(i * 8, (i + 1) * 8)
    }).toList
  }

  def toNum(inputStr: String): Int = {
    def toNumInner(input: List[Char], acc: Int): Int = input match {
      case Nil => acc
      case head :: tail => head match {
        case 'I' => toNumInner(tail, (acc << 1) + 1)
        case 'O' => toNumInner(tail, acc << 1)
      }
    }

    toNumInner(inputStr.toList, 0)
  }

  def toStr(stream: String): String = {
    slice(stream).map(toNum(_)).map(_.toChar).mkString("")
  }

  val lines = io.Source.fromFile("A-small-practice.in").getLines()
  val out = new PrintWriter(new File("A-small-practice.out" ))

  for (i <- 1 to lines.next.toInt) {
    lines.next
    out.println(s"Case #${i}: ${toStr(lines.next)}")
  }
  out.close
}