比如说[板子题](https://www.luogu.com.cn/problem/P3384)要求支持的操作
by LongDouble @ 2022-01-15 16:45:02
[2486](https://www.luogu.com.cn/problem/P2486) 树链剖分+线段树
[4556](https://www.luogu.com.cn/problem/P4556) 可以套线段树合并
[推荐这个提单（](https://www.luogu.com.cn/training/1654#information)
by Ender32k @ 2022-01-15 16:51:45