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  1. import scala.collection._
  2.  
  3. class Bag[E] private (val items: Map[E, Int]) {
  4.   def isEmpty = items.isEmpty
  5.   def view = items.keys
  6.   def -(item: E) = new Bag[E](items(item) match {
  7.     case 1 => items - item
  8.     case n => items.updated(item, n - 1)
  9.   })
  10. }
  11.  
  12. object Bag {
  13.   def apply[E](items: Traversable[E]): Bag[E] = {
  14.     val itemCounts = mutable.HashMap.empty[E, Int].withDefaultValue(0)
  15.     items.foreach(itemCounts(_) += 1)
  16.     new Bag[E](itemCounts)
  17.   }
  18. }
  19.  
  20. object Main extends App {
  21.   type Solution = Option[Seq[(String, String)]]
  22.  
  23.   def solve(items: Bag[String], anagrams: String, matches: Solution = None): Solution =
  24.     if (items.isEmpty) matches
  25.     else (for {
  26.       item <- items.view
  27.       (label, rest) = anagrams.splitAt(item.length)
  28.       if item == label.sorted
  29.       newMatches = Option(matches.getOrElse(immutable.Queue.empty) :+ (item, label))
  30.       solution <- solve(items - item, rest, newMatches)
  31.     } yield solution).headOption
  32.  
  33.   val items = readLine().split(" ")
  34.   val anagrams = readLine()
  35.  
  36.   val sortedItems = mutable.Buffer.empty[String]
  37.   val itemOrderRestorator = mutable.Map.empty[String, mutable.Queue[String]]
  38.  
  39.   for (item <- items) {
  40.     val sorted = item.sorted
  41.     sortedItems += sorted
  42.     itemOrderRestorator.getOrElseUpdate(sorted, new mutable.Queue).enqueue(item)
  43.   }
  44.  
  45.   solve(Bag(sortedItems), anagrams).map(_.unzip) match {
  46.     case None => println("Ne fart")
  47.     case Some((items, labels)) =>
  48.       println(labels.mkString(" "))
  49.       items.foreach(s => print(itemOrderRestorator(s).dequeue() + " "))
  50.   }
  51. }
Success #stdin #stdout 0.44s 383168KB
comments (?)
stdin
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abab ab ab ab ab ab ab ab ab ab ab ab
abababababababababababaabb
stdout
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ab ab ab ab ab ab ab ab ab ab ab aabb
ab ab ab ab ab ab ab ab ab ab ab abab
https://ideone.com/8AKTBi
language:
Scala (scala 2.12.8)
created:
9 years ago
visibility:
public

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