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Flowers 题目描述 Recently Jack becomes much more romantic. He would li... 阅读全文
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Leftbest 链接:https://ac.nowcoder.com/acm/contest/7830/A 来源:牛客网 题目描述... 阅读全文
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Points 题目描述 Jack and Rose are playing games after working out so m... 阅读全文
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最小公倍数之和 题目描述: 对于A1,A2…AN,求 ∑ i=1N∑ j=1Nlcm(Ai,Aj) 题解: 莫比乌斯反演,直接强推一... 阅读全文