Advent of Code 2017 - Day2

aoc2017D2.scala

  def checkCorruptChecksum(_source: List[List[Int]]) = {
    _source.map(
      _.map(x => (x, x))
        .reduceLeft((x, y) => (x._1 min y._1, x._2 max y._2)
        )
    ).map { case (a, b) => b - a }
      .sum
  }

  def advancedCheckCorruptChecksum(_source: List[List[Int]]) = {
    _source.map(_.combinations(2).collect {
      case a :: b :: _ if a % b == 0 => a / b
      case a :: b :: _ if b % a == 0 => b / a
    }.sum).sum
  }