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