emmm..
by 兮水XiShui丶 @ 2018-03-15 22:15:26
emmm......
by wucstdio @ 2018-03-16 16:29:34
emmm..
by ecnerwaIa @ 2019-01-02 15:44:05
@[wucstdio](/space/show?uid=54214) 这题只有一个点需要杜教筛，所以无论你杜教筛写成啥样都只会WA一个点...我就WA了一页QAQ
```cpp
ans-=ask_for_s(n/i);
```
应该改成
```cpp
ans-=ask_for_s(n/i)*(j-i+1);
```
by ouuan @ 2019-01-09 20:04:19
@[ouuan](/space/show?uid=49742) 谢dalao
by wucstdio @ 2019-01-09 20:23:03