leetcode860

使用C++进行编码：

bool lemonadeChange(vector<int>& bills) {
    int FIVE = ;
    int TEN = ;
    int TWEN = ;

    int N = bills.size();
    for (int i = ; i < N; i++)
    {
        int p = bills[i];
        if (p == )
        {
            FIVE++;
        }
        else if (p == )
        {
            TEN++;
            FIVE--;
        }
        else if (p == )
        {
            TWEN++;
            if (TEN > )
            {
                TEN--;
                FIVE--;
            }
            else
            {
                FIVE -= ;
            }
        }

        if (FIVE <  || TEN <  || TWEN < )
        {
            return false;
        }
    }
    return true;
}