can_build_from_puzzler

can_build_from_puzzler.scala

val dictionary = Map(
  "a" -> Set("apple", "ant"),
  "b" -> Set("banana", "barn")
)

// lets count how many times each letter occurs in all words in our dictionary
val letters = dictionary.values.flatMap {x => x.flatMap {_.toCharArray} }
val letterCounts = letters.groupBy(identity).mapValues(_.size)
letterCounts.toArray.sorted.foreach{println}

//output:
(a,2)
(b,1)
(e,1)
(l,1)
(n,2)
(p,1)
(r,1)
(t,1)