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