8 lines
320 B
Scala
8 lines
320 B
Scala
implicit def toComb(m: Int) = new AnyRef {
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def comb(n: Int) = recurse(m, List.range(0, n))
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private def recurse(m: Int, l: List[Int]): List[List[Int]] = (m, l) match {
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case (0, _) => List(Nil)
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case (_, Nil) => Nil
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case _ => (recurse(m - 1, l.tail) map (l.head :: _)) ::: recurse(m, l.tail)
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}
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}
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