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src
- main/scala/org/codecraftlabs/leetcode
  - TwoCharacters.scala
- test/scala/org/codecraftlabs/leetcode
  - TwoCharactersSpec.scala

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	`1`	`+package org.codecraftlabs.leetcode`
	`2`	`+`
	`3`	`+object TwoCharacters {`
	`4`	`+ def alternate(s: String): Int = {`
	`5`	`+ val chars = s.toCharArray.distinct`
	`6`	`+ val combinations = chars.combinations(2).map { case Array(x, y) => (x, y) }.toList`
	`7`	`+ val elements = combinations.map(i => s.replaceAll(s"[^${i._1}${i._2}]", ""))`
	`8`	`+ val filtered = elements.filter(validate)`
	`9`	`+ filtered.map(item => item.length).sorted.reverse.head`
	`10`	`+ }`
	`11`	`+`
	`12`	`+ private def validate(item: String): Boolean = {`
	`13`	`+ val lastPosition = item.length - 2`
	`14`	`+ var broken = false`
	`15`	`+ for (pos <- 0 until lastPosition) {`
	`16`	`+ if (item.charAt(pos) != item.charAt(pos + 2)) {`
	`17`	`+ return false`
	`18`	`+ }`
	`19`	`+ }`
	`20`	`+ true`
	`21`	`+ }`
	`22`	`+}`

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	`1`	`+package org.codecraftlabs.leetcode`
	`2`	`+`
	`3`	`+import org.scalatest.{FlatSpec, Matchers}`
	`4`	`+`
	`5`	`+class TwoCharactersSpec extends FlatSpec with Matchers {`
	`6`	`+`
	`7`	`+ "beabeefeab" should "return 5" in {`
	`8`	`+ TwoCharacters.alternate("beabeefeab") shouldEqual 5`
	`9`	`+ }`
	`10`	`+}`

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