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摘要： Codeforces Round #569 (Div. 2) A. Alex and a Rhombus While playing with geometric figures Alex has accidentally invented a concept of a n-th order rho 阅读全文

摘要： Codeforces Round #569 (Div. 2) B. Nick and Array Nick had received an awesome array of integers a=[a1,a2,…,an] as a gift for his 5 birthday from his m 阅读全文

摘要： Codeforces Round #569 (Div. 2) C. Valeriy and Deque Recently, on the course of algorithms and data structures, Valeriy learned how to use a deque. He 阅读全文