Project Euler: Problem 79

Euler0079.scala

package euler.zerosum

import scala.io.Source

object Euler0079 {

  def main(args: Array[String]) {
    val f = Source.fromFile("resources/keylog.txt")
    val keylogs = f.getLines.toList
    f.close()

    val passcords = keylogs.mkString.toList.distinct
                    .permutations
                    .map(_.mkString)
                    .toList

    val regex = keylogs.map(_.toList.mkString("[0-9]*", "[0-9]*", "[0-9]*"))

    println(passcords.filter(p => regex.forall(p.matches(_))).head)
  }
}