HAOI2011 - Problem b

【LuoguP2522】【BZOJ2301】【HAOI2011】Problem b
题目链接1: https://www.luogu.org/problem/P2522
题目链接2: https://www.lydsy.com/JudgeOnline/problem.php?id=2301

前言

机房很久前就人均会反演,今天我终于看懂是啥了。

然后把整除分块理解透彻!

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