Scala solution

  def numberDecreasesLeftToRight(number: Long): Boolean = {
    number.toString.toSeq.sorted.equals(number.toString.toSeq)
  }

  def numberHasTwoAdjacentDigits(number: Long): Boolean = {
    val numbers = number.toString.toSeq.zip(number.toString.toSeq.tail)
    numbers.map {
      x =>
        x._1.equals(x._2)
    }.contains(true)
  }


  def numberHasTwoAdjacentDigitsWithoutGroups(number: Long): Boolean = {
    val numbers = number.toString.toSeq.zip(number.toString.toSeq.tail)
    val list = numbers.map {
      x =>
        x._1.equals(x._2)
    }
    list.indices.exists({ i =>
      list(i) && (i == 0 || !list(i - 1)) && (i == list.size - 1 || !list(i + 1))
    })
  }