显然你只需要枚举到$\sqrt n$
by konjacq @ 2021-04-10 16:32:02
我眼瞎了 /px
by CGDGAD @ 2021-04-10 16:33:15
希望更丰富的**展现**？[使用Markdown](https://www.luogu.com.cn/blog/luogu/how-to-use-markdown)
by 听凭风引 @ 2021-04-10 17:18:46
@[吃土的早八人](/user/490165) 汪峰展示MD
by EC75 @ 2021-12-30 10:03:13