退役前一直想把莫比乌斯反演与容斥原理统一在一起，奈何自己水平不足，只能作罢。
这次把《组合数学》、《具体数学》、《初等数论》的相关内容读了一遍，总算是完成了这个遗愿：
mobius_and_inclusion_exclusion_principle
Download：https://oi.qizy.tech/wp-content/uploads/2018/03/mobius_and_inclusion_exclusion_principle.pdf
拓展阅读1：http://blog.miskcoo.com/2015/12/inversion-magic-binomial-inversion
拓展阅读2：http://vfleaking.blog.uoj.ac/blog/87
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