若该做法是题解区没有的做法，申请加入题解（
@[SSerxhs](/user/29826)
by Prean @ 2021-09-30 16:36:16
PPT/bx
盲猜有警。
by 冰糖鸽子 @ 2021-09-30 16:49:11
草居然是阿机的打字狸
by 冰糖鸽子 @ 2021-09-30 16:50:51
我的线段树比树状数组还快就离谱。。。
by Prean @ 2021-09-30 17:38:58
催.jpg
@[SSerxhs](/user/29826)
by Prean @ 2021-10-15 20:42:20
@[Prean](/user/160839) 过了
by SSerxhs @ 2021-10-23 17:36:58