HJ61 放苹果题目：https://www.nowcoder.com/practice/bfd8234bb5e84be0b493656e390bdebf?tpId=37&tqId=21284&rp=1&ru=/exam/oj/ta&qru=/exam/oj/ta&sourceUrl=%2Fexam%2Foj%2Fta%3FtpId%3D37&difficulty=undefined&judgeStatus=undefined&tags=&