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Message from discussion week1的第三题体现出函数式语言的优美
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Zang MingJie  
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 More options Oct 8 2012, 4:16 am
From: Zang MingJie <zealot0...@gmail.com>
Date: Mon, 8 Oct 2012 01:16:59 -0700 (PDT)
Local: Mon, Oct 8 2012 4:16 am
Subject: week1的第三题体现出函数式语言的优美
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递归+一个mapreduce就搞定了

  def countChange(money: Int, coins: List[Int]): Int = if (coins.isEmpty) {
    if (money == 0) 1 else 0
  } else {
    val cur = coins.head
    (0 /: ((0 to (money / cur)) map { i => countChange(money - i * cur,
coins.tail) })) { _ + _ }
  }


 
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