`#pragma GCC optimize(O2)`
by int32 @ 2021-10-17 19:03:29
~~名字好评~~
o2 是编译器内置的一个指令，怎么 "手写"？
by yuchenren @ 2021-10-17 19:04:08
```
#pragma GCC optimize ("2")
```
by lgvc @ 2021-10-17 19:04:23
[this](https://www.luogu.com.cn/paste/z26v4e9n)
by 削板军霸 @ 2021-10-17 19:05:45
楼主问的是如何手写 O2，而不是如何打开 O2 吧我理解的。
by int64 @ 2021-10-17 19:08:14
考场上估计是无望了。
by int64 @ 2021-10-17 19:08:36