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24 lines
457 B
Scala
24 lines
457 B
Scala
/**
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* Usage: scala part2.scala < input
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*/
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import scala.io.StdIn
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import scala.collection.Iterator
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val items = Stream
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.continually(StdIn.readLine)
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.takeWhile(_ != null)
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.map(Integer.parseInt)
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.toList
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println(
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Stream
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.continually(items.toStream)
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.flatten
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.scanLeft(0)(_ + _)
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.scanLeft(Map.empty[Int, Int]){case (acc, item) => acc + (item -> (acc.getOrElse(item, 0) + 1)) }
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.filter(_.count(_._2 == 2) > 0)
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.map(_.maxBy(_._2))
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.head
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)
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