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n人中m人が当選するくじ (Nested Flatten)
とりあえず一発でやるならこうかなあ。
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import scala.util.Sorting
def lot(n:Int, m:Int):Seq[Int] = {
  Sorting.stableSort[Int, Double](List.range(0,n),{x=>Math.random}).take(m)
}
println(lot(2,10).mkString(","))

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