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Description Anatoly lives in the university dorm as many other students do. As you know, cockroaches are also living there together with students. Coc 阅读全文
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Description Every summer Vitya comes to visit his grandmother in the countryside. This summer, he got a huge wart. Every grandma knows that one should 阅读全文
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Description Given a n × n matrix A and a positive integer k, find the sum S = A + A2 + A3 + … + Ak. Given a n × n matrix A and a positive integer k, f 阅读全文