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Problem E. Master of SubgraphYou are given a tree with n nodes. The weight of the i-th node is wi. Given a positive integer m, now you need to judge t 阅读全文
摘要：
Problem K. Master of SequenceTherearetwosequencesa1,a2,··· ,an, b1,b2,··· ,bn. LetS(t) =∑n i=1⌊t−bi ai ⌋. Therearemoperationswithin three kinds as fol 阅读全文