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def permutator[T](list: List[T]): List[List[T]] = { | |
def _p(total: Int, list: List[T]): List[List[T]] = { | |
if (total == 0) { | |
list.map(List(_)) | |
} else { | |
for (i <- list; | |
j <- _p(total - 1, list)) | |
yield { i :: j } | |
} | |
} | |
_p(list.length - 1, list) | |
} | |
val list = (1 to 3).toList | |
permutator(list).foreach(println) | |
val list2 = List("A", "B", "C") | |
permutator(list2).foreach(println) | |
// Output | |
// list: List[Int] = List(1, 2, 3) | |
// List(1, 1, 1) | |
// List(1, 1, 2) | |
// List(1, 1, 3) | |
// List(1, 2, 1) | |
// List(1, 2, 2) | |
// List(1, 2, 3) | |
// List(1, 3, 1) | |
// List(1, 3, 2) | |
// List(1, 3, 3) | |
// List(2, 1, 1) | |
// List(2, 1, 2) | |
// List(2, 1, 3) | |
// List(2, 2, 1) | |
// List(2, 2, 2) | |
// List(2, 2, 3) | |
// List(2, 3, 1) | |
// List(2, 3, 2) | |
// List(2, 3, 3) | |
// List(3, 1, 1) | |
// List(3, 1, 2) | |
// List(3, 1, 3) | |
// List(3, 2, 1) | |
// List(3, 2, 2) | |
// List(3, 2, 3) | |
// List(3, 3, 1) | |
// List(3, 3, 2) | |
// List(3, 3, 3) | |
// res0: Unit = () | |
// list2: List[String] = List(A, B, C) | |
// List(A, A, A) | |
// List(A, A, B) | |
// List(A, A, C) | |
// List(A, B, A) | |
// List(A, B, B) | |
// List(A, B, C) | |
// List(A, C, A) | |
// List(A, C, B) | |
// List(A, C, C) | |
// List(B, A, A) | |
// List(B, A, B) | |
// List(B, A, C) | |
// List(B, B, A) | |
// List(B, B, B) | |
// List(B, B, C) | |
// List(B, C, A) | |
// List(B, C, B) | |
// List(B, C, C) | |
// List(C, A, A) | |
// List(C, A, B) | |
// List(C, A, C) | |
// List(C, B, A) | |
// List(C, B, B) | |
// List(C, B, C) | |
// List(C, C, A) | |
// List(C, C, B) | |
// List(C, C, C) | |
// res1: Unit = () |
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