ACM学习历程—ZOJ 3868 GCD Expectation(莫比乌斯 || 容斥原理)
摘要:
DescriptionEdwardhasasetofnintegers{a1,a2,...,an}.Herandomlypicksanonemptysubset{x1,x2,…,xm}(eachnonemptysubsethasequalprobabilitytobepicked),andwould... 阅读全文
posted @ 2015-10-10 21:23 AndyQsmart 阅读(322) 评论(0) 推荐(0)
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