```cpp
if(!flag) cout<<"NO"<<endl;
```
你的NO，应该是No
by 浅入深出 @ 2022-12-09 13:25:09
@[浅入深出](/user/386178) 谢谢大佬，已AC
by tyyxbx @ 2022-12-31 12:26:58
牛逼，谢谢大佬
by HNZZT @ 2023-08-09 19:27:16