1018. Binary Prefix Divisible By 5可被 5 整除的二进制前缀

网址：https://leetcode.com/problems/binary-prefix-divisible-by-5/

一次for循环遍历数组，在上次计算的基础上得到本次的结果！

class Solution {
public:
    vector<bool> prefixesDivBy5(vector<int>& A)
    {
        vector<bool> ans;
        int num = 0;
        int pre_num = 0;
        for(int i=0; i<A.size(); i++)
        {
            num = 0;
            num += pre_num * 2 + A[i];
            num = num % 5;
            pre_num = num;
            if(num % 5 == 0)
            {
                ans.push_back(true);
            }
            else
                ans.push_back(false);
        }
        return ans;
    }
};