树上差分WA on 23 求助

CF19E Fairy

@[ClHg2](/user/253946) @[ACACACACACACACACACAC](/user/374330) 帮我调题(
by Tsukinaga_Ichiyo @ 2023-06-27 21:46:15


@[Ziqqurat](/user/483928) /bx
by yimuhua @ 2023-07-09 10:46:23


@[Ziqqurat](/user/483928) 答案要排序(为什么没有SPJ!!!)
by roger_yrj @ 2023-07-12 17:14:41


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