def parseLong(input: CharSequence, start: Int, end: Int): Long = {
  var negative: Boolean = false
  var i: Int = start
  var result: Long = 0L

  if (input.charAt(start) == '-') {
    negative = true
    i += 1
  }

  val limit: Long = if (negative) Long.MinValue else -Long.MaxValue
  val limitMult: Long = limit / 10L

  while (i < end) {
    val digit: Int = input.charAt(i).toInt - 48

    if (i - start < 18) {
      result = result * 10L - digit
    } else {
      if (result < limitMult) {
        throw new NumberFormatException(s"For input string: $input")
      } else {
        result *= 10L
        if (digit > 0) {
          if (result < limit + digit) {
            throw new NumberFormatException(s"For input string: $input")
          } else {
            result -= digit
          }
        }
      }
    }

    i += 1
  }

  if (negative) result else -result
}