Day4

Day4.scala

val InputRegex = "(\\d+)-(\\d+),(\\d+)-(\\d+)".r

def matchFullContain(str: String): Boolean = str match {
  case InputRegex(t1, t2, e1, e2) =>
    (t1.toInt <= e1.toInt && e2.toInt <= t2.toInt) ||
      (e1.toInt <= t1.toInt && t2.toInt <= e2.toInt)
  case _ => false
}

def matchOverlap(str: String): Boolean = str match {
  case InputRegex(t1, t2, e1, e2) =>
    (t2.toInt >= e1.toInt && t1.toInt <= e2.toInt) ||
      (t1.toInt <= e2.toInt && e1.toInt <= t2.toInt)
  case _ => false
}

val lines = Source.fromResource("day4.txt").getLines()
lines.count(matchFullContain)
lines.count(matchOverlap)