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johnelf/combine.scala

Created July 4, 2014 09:05
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循环赛
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combine.scala
type SoccerFixtures = List[(String, String)]
def doCombine(teams: List[String], res: SoccerFixtures): SoccerFixtures = teams match {
case Nil => res
case pick :: others =>
doCombine(others, others.map(o => (pick, o)) ::: res)
}
doCombine(List("a", "b", "c", "d"), List()).sorted
def combine(teams: List[String]) = doCombine(teams, List())
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