mcfx's blog - Codeforces 809E. Surprise me! 的评论
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###Description 给一棵树，每个点点权 $$a_i$$，保证 $$a_i$$各不相同，现在随机选两个点 $$u,v$$，求 $$f(u,v)=\phi(a_u\cdot a_v)\c...
Thu, 08 Jun 2017 13:03:13 +0800
Thu, 08 Jun 2017 13:03:13 +0800
Sengxian
/archives/236/#comment-11
/archives/236/#comment-11
Thu, 08 Jun 2017 13:03:13 +0800
Sengxian
似乎虚树可以做到一个 log，感觉挺妙的。
https://blog.sengxian.com/solutions/cf-809e
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/archives/236/#comment-11#comments