gistfile1.kt

import java.util.Collection

fun IntRange.fizzBuzz() = this.map {
  when (#(it % 3, it % 5)) {
    is #(0, 0) -> "fizzbuzz"
    is #(0, *) -> "fizz"
    is #(*, 0) -> "buzz"
    else -> ""
  }
}
fun IntRange.findResult(closure : (Int)->Collection<Int>?) : Collection<Int>? {
  for (i in this) {
    val ret = closure(i)
    if (ret != null) {
      return ret
    }
  }
  return null;
}

fun toPos(input : Collection<String>) = (1..15).findResult (){
  val ret = (it..it + input.size - 1)
  if (ret.fizzBuzz() == input) {
    ret.toList()
  } else {
    null
  }
} ?: arrayList<Int>()

fun main(args : Array<String>) {
  println(toPos(arrayList("fizz")))                         // [3]
  println(toPos(arrayList("buzz")))                         // [5]
  println(toPos(arrayList("fizzbuzz")))                     // [15]
  println(toPos(arrayList("fizz", "buzz")))                 // [9, 10]
  println(toPos(arrayList("buzz", "fizz")))                 // [5, 6]
  println(toPos(arrayList("fizz", "", "buzz", "fizz")))     // [3, 4, 5, 6]
  println(toPos(arrayList("fizz", "", "", "fizz")))         // [6, 7, 8, 9]
  println(toPos(arrayList("fizz", "", "", "fizz", "buzz"))) // [6, 7, 8, 9, 10]
  println(toPos(arrayList("fizzbuzz", "", "", "fizz")))     // [15, 16, 17, 18]
}