线段树之类的没啥好题
P7476 P4425
by ___balalida___ @ 2022-05-23 12:56:12
P4259
by 404Not_Found @ 2022-05-23 13:03:41
去做可持久化
by Small_Tang @ 2022-05-23 13:06:04
https://www.luogu.com.cn/blog/flyingfan/xian-duan-shu-xiang-guan-ji-qiao-di-xiao-xiao-zong-jie
by liqingyang @ 2022-05-23 14:14:03