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tyano/gist:1429205

Created December 4, 2011 04:48
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List(1, 2, 3, 1) を Map(1 -> 2, 2 -> 1, 3 -> 1)
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gistfile1.scala
List(1,2,3,1).zip(List(1,1,1,1)).foldLeft(Map[Int,Int]()) { (x, y) => x.get(y._1) match { case Some(v) => x + Pair(y._1, (v + y._2)) case None => x + y }}
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