https://codility.com/demo/results/trainingHFFKXA-WBM/

BinaryGap.scala

import scala.collection.JavaConversions._

// you can write to stdout for debugging purposes, e.g.
// println("this is a debug message")

object Solution {
  def solution(N: Int): Int = {
    val bin1 = N.toBinaryString
    println(bin1)
    var bin = bin1
    if (bin1(bin1.length - 1) == '0') {
      bin = bin1.substring(0, bin1.lastIndexOf('1'))
    }
    val binArr = bin.split("1")

    println(binArr.length)

    var len = 0;

    for (b <- binArr) {
      println(b)
      if (len < b.length)
        len = b.length;
    }

    len
  }

  def main(args: Array[String]) {
    println(solution(readInt))
  }
}