因为可以二分
by 彼岸归航 @ 2018-09-22 14:33:33
```cpp
#include<iostream>
int main()
{
cout<<WC!!!;
return 0;
}
```
by 智子·起源 @ 2018-12-12 17:00:17
@[chen_zhe](/space/show?uid=8457)
by 幻影学霸刘 @ 2019-05-06 12:45:25
《培优新方法》了解一下
by 大犇≠大奔 @ 2020-02-10 09:53:10