随笔分类 - 题解
摘要:2020牛客暑期多校训练营(第二场)J - Just Shuffle
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摘要:Educational Codeforces Round 93 (Rated for Div. 2)
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摘要:$$
\sum_{a_{1}=1}^{n} \sum_{a_{2}=1}^{n} \ldots \sum_{a_{x}=1}^{n}\left(\prod_{j=1}^{x} a_{j}^{k}\right) f\left(\operatorname{gcd}\left(a_{1}, a_{2}, \ldots, a_{x}\right)\right) \cdot \operatorname{gcd}\left(a_{1}, a_{2}, \ldots, a_{x}\right)
$$
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摘要:Educational Codeforces Round 80 (Rated for Div. 2)
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摘要:给你 $n$ 根木根,任选 3 根,能组成三角形的概率是多少?
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