code: def plus_one_v1(digits):
      
      digits[-1] = digits[-1] + 1
      res = []
      ten = 0
      i = len(digits)-1
      while i >= 0 or ten == 1:
          summ = 0
          if i >= 0:
              summ += digits[i]
          if ten:
              summ += 1
          res.append(summ % 10)
          ten = summ // 10
          i -= 1
      return res[::-1]
docs: :type digits: List[int]
      :rtype: List[int]