```cpp
pos=(pos+n)%n;
```
改成
```cpp
pos%=n;
if(pos<=0)pos+=n;
```
by Lucifer_Bartholomew @ 2019-01-28 20:56:46
@[e_funny](https://www.luogu.org/space/show?uid=109124)
by Lucifer_Bartholomew @ 2019-01-28 20:57:26
三体人民欢迎你
by clever陈为从 @ 2019-02-12 21:43:45
@[clever陈为从](/space/show?uid=152380) 我们是同志了
by South_Sky_Plume5 @ 2019-03-02 19:33:39
@[南天羽5](/space/show?uid=155924) 同志！
by clever陈为从 @ 2019-03-02 20:16:05