zsb.scala

// See https://news.ycombinator.com/item?id=7856135
object zsb extends App {

  type T = (Int,Int,Int)

  def ok(zsb:T) = { val (z,s,b) = zsb; z>=0 && s>=0 && b>=0 }

  def parse(s:String) = { val arr = s.split(",").map(s=> s.toInt); (arr(0), arr(1), arr(2)) }

  def buyout(zsb:T, set:Set[T]):Set[T] = {
    val (z,s,b) = zsb // z zombie, s startup, b bigcorp
    val ret = Set((z-1, s-1, b+1), (z-1,s+1,b-1), (z+1,s-1,b-1))
    .filter(ok)
    .diff(set)
    if (ret.size > 0) set ++ ret else set
  }

  def loop(zsb:T, set:Set[T]):Unit = {
    val newset = buyout(zsb,set)
    if ( newset != set) {
      //println(newset.size)
      //newset.foreach(println)
      newset.foreach { e => loop(e,newset) }
    } //else {
       println(newset.size)
       newset.foreach(println)
    //}
  }

  loop(parse(args(0)), Set[T]())
}