aoc_2018_day1.scala

import scala.io.Source

object Advent {
  def main(args: Array[String]): Unit = {
    val data = Source.fromFile("data/day1.txt").getLines.map(_.toInt).toList

    println(f"Part 1: ${data.sum}")

    /* Can someone help me get this second part a littler more Scala-like (more functional, less procedural)? Please let me know! */
    var seen: Set[Int] = Set()
    var dup: Option[Int] = None
    var start: Int = 0
    
    while (dup.isEmpty) {
      val scanned = data.scanLeft(start)(_ + _).drop(1)
      dup = scanned.find(seen.contains(_))
      seen = seen ++ scanned
      start = scanned.last
    }

    println(f"Part 2: ${dup.get}")
  }
}