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C. From Y to Y Source http://codeforces.com/contest/849/problem/C Description Description From beginning till end, this message has been waiting to be 阅读全文
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B. Tell Your World Source http://codeforces.com/contest/849/problem/B Description Description Connect the countless points with lines, till we reach t 阅读全文
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A. Odds and Ends Source http://codeforces.com/contest/849/problem/A Description Description Where do odds begin, and where do they end? Where does hop 阅读全文