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object Main {
def min0[A](less: (A, A) => Boolean, xs: List[A]): Option[A] = xs match {
case List() => None
case List(x) => Some(x)
// case x :: Nil => Some(x)
case y :: ys => (min0(less, ys): @unsealed) match {
case Some(m) => if (less(y, m)) Some(y) else Some(m)
case None => Some(y)
}
}
def min(xs: List[Int]) = min0((x: Int, y: Int) => x < y, xs);
def main(args: Array[String]) =
Console.println(min(List()));
}
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