根据题目的hint，使用单层循环计算：

1 class Solution(object): 2     def prefixesDivBy5(self, A: 'List[int]') -> 'List[bool]': 3         n = len(A) 4         result = list() 5         preNum = 0 6         for i in range(n): 7             binNum = A[i] 8             X = preNum * 2 + binNum 9             if X % 5 == 0:10                 result.append(True)11             else:12                 result.append(False)13             preNum = X14         return result