@[Bob大大](/space/show?uid=110663) 没必要吧？我是这样
```cpp
template <class type, class pushup=seg_add<type>, class pushdown=seg_add<type> >
```
前面这样
```
template <class type>
class seg_add
```
by 樱初音斗橡皮 @ 2019-04-18 15:56:58
emm?~~luogu黑科技失误~~
by 樱初音斗橡皮 @ 2019-04-18 15:57:20
@[樱初音斗橡皮](/space/show?uid=66287)
~~都可以呀QAQ～~~
by fzfnf @ 2019-04-18 16:00:26