HJ41 称砝码题目：https://www.nowcoder.com/practice/f9a4c19050fc477e9e27eb75f3bfd49c?tpId=37&tqId=21264&rp=1&ru=/exam/oj/ta&qru=/exam/oj/ta&sourceUrl=%2Fexam%2Foj%2Fta%3FtpId%3D37&difficulty=undefined&judgeStatus=undefined&tags=&