@[zyx_Henry](/user/1294257) 看题！输入的区间l,r，有可能出现l>r
by focus_costan1 @ 2024-08-05 18:38:31
@[zyx_Henry](/user/1294257)
所以
```cpp
if(l>r){
swap(l,r);
}
```
by focus_costan1 @ 2024-08-05 18:39:15
@[zyx_Henry](/user/1294257) 求关注！
by focus_costan1 @ 2024-08-05 18:39:34
@[zyx_Henry](/user/1294257)
关注[大号](https://www.luogu.com.cn/user/677604)
by focus_costan1 @ 2024-08-05 18:40:11
666,关注了记得壶关
by zyx_Henry @ 2024-08-06 20:02:23
@[focus_aurora](https://www.luogu.com.cn/user/677604)
by zyx_Henry @ 2024-08-14 22:24:30