https://45475.blog.luogu.org/mathematical-expectation
by ShineEternal @ 2019-08-04 12:10:57
还有精美讲解（逃
by ShineEternal @ 2019-08-04 12:11:09
三倍经验get
by kkkstra @ 2019-11-06 22:28:00
@[1289H2051N343O375S8](/user/45475) 讲解的吼哇
by Moon_Goddy @ 2021-07-28 11:39:55
get
by itisover @ 2021-11-01 22:05:30
再加一题，虽然是外站题
[连击游戏](https://iai.sh.cn/problem/419)
by 寒烟冷浅暮殇 @ 2022-07-21 16:51:12
osu!人狂喜。但是连击分真的是次方吗。
by cinout001_Wii @ 2022-08-02 18:27:54
@[cinout001_Wii](/user/138492) 普通模式和 $V_2$ 好像都不是吧。
by ChthollyForever @ 2022-09-22 11:06:32