leetcode1018

根据题目的hint，使用单层循环计算：

 class Solution(object):

     def prefixesDivBy5(self, A: 'List[int]') -> 'List[bool]':

         n = len(A)

         result = list()

         preNum = 0

         for i in range(n):

             binNum = A[i]

             X = preNum * 2 + binNum

             if X % 5 == 0:

                 result.append(True)

             else:

                 result.append(False)

             preNum = X

         return result