scalamatsuri 2016

mvrck.scala

/*
 *   MAVE
 * + RIcK
 * -------
 *  Scala
*/

import scala.annotation.tailrec

@tailrec
def combine(v: Traversable[Int], acc: Int = 0): Int = if (v.isEmpty) acc else combine(v.tail, acc * 10 + v.head)
def maverick(n: Seq[Int]): Boolean = combine(n.slice(0,4)) + combine(n.slice(4,8)) == combine(List(n(8), n(6), n(1), n(9), n(1)))

val l = (0 to 9).permutations.filter(n =>
  n(0) != 0 &&
  n(4) != 0 &&
  n(6) <= 7 &&
  n(8) == 1 &&
  maverick(n)
)
l.foreach(println)