@[XiouHarry](/user/594426) 用&，a和b就是实参了，就改变了吧，[形参与实参的区别](https://zhidao.baidu.com/question/339722896.html)
by yangyuanxi44 @ 2021-11-08 00:08:59
@[yangyuanxi44](/user/450893) 哦，好的
by XiouHarry @ 2021-11-08 22:37:33
@[XiouHarry](/user/594426) swap可以直接用<algorithm>导入
by lszxxy @ 2022-08-11 13:53:33