# mistake
here
```cpp
if(l>r)swap(l,r);
scanf("%lld%lld%lld",&op,&l,&r);
```
先读入，再交换
```cpp
scanf("%lld%lld%lld",&op,&l,&r);
if(l>r)swap(l,r);
```
by ZYLZPP @ 2024-05-22 18:42:46
@[__Zhx__](/user/575363)
神奇错误
by ZYLZPP @ 2024-05-22 18:43:17
@[ZYLZPP](/user/932511)
感谢dalao，已关注
by __Zhx__ @ 2024-05-23 12:37:55