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  1. object Main extends App {
  2.   object Wire extends Enumeration {
  3.     val white, black, purple, red, green, orange, none = Value
  4.   }
  5.   @annotation.tailrec
  6.   def fix(fixed: List[List[String]] = List.empty, lines: List[String]): List[List[String]] = {
  7.     if (!lines.contains("")) {
  8.       println("""lines does not contain "".""")
  9.       println(lines)
  10.       lines :: fixed
  11.     } else {
  12.       println("""lines contains "".""")
  13.       println(lines)
  14.       val (current, unfixed) = lines.splitAt(lines.indexOf(""))
  15.       println(s"current = $current")
  16.       println(s"unfixed = $unfixed")
  17.       fix(current :: fixed, unfixed.tail)
  18.     }
  19.   }
  20.   def cut(wires: Seq[Wire.Value], prev: Wire.Value = Wire.none): Boolean = {
  21.     if (wires.isEmpty) return true
  22.     val current = wires.head
  23.     val boom = prev match {
  24.       case Wire.white => current == Wire.white || current == Wire.black
  25.       case Wire.red => current != Wire.green
  26.       case Wire.black => current == Wire.white || current == Wire.green || current == Wire.orange
  27.       case Wire.orange => current != Wire.red && current != Wire.black
  28.       case Wire.green => current != Wire.orange && current != Wire.white
  29.       case Wire.purple => current == Wire.purple || current == Wire.orange || current == Wire.green || current == Wire.white
  30.       case Wire.none => false
  31.     }
  32.     if (boom) false else cut(wires.tail, current)
  33.   }
  34.   fix(lines = io.Source.stdin.getLines.toList).map(_.map(Wire.withName)).map(cut(_)).reverse.foreach(s => println(if (s) "Bomb defused" else "Boom"))
  35. }
Success #stdin #stdout 0.18s 322432KB
comments (?)
stdin
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white
red
green
white

white
orange
green
white
stdout
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lines contains "".
List(white, red, green, white, , white, orange, green, white)
current = List(white, red, green, white)
unfixed = List(, white, orange, green, white)
lines does not contain "".
List(white, orange, green, white)
Bomb defused
Boom
https://ideone.com/vLYEQJ
language:
Scala (scala 2.12.8)
created:
7 years ago
visibility:
public

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