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Chiaki often participates in international competitive programming contests. The time zone becomes a big problem. Given a time in Beij... 阅读全文
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hiaki has an array of nn positive integers. You are told some facts about the array: for every two elements aiai and ajaj in the subar... 阅读全文
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Chiaki has 3n3n points p1,p2,…,p3np1,p2,…,p3n. It is guaranteed that no three points are collinear. Chiaki would like to construct nn ... 阅读全文
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Given an integer nn, Chiaki would like to find three positive integers xx, yy and zzsuch that: n=x+y+zn=x+y+z, x∣nx∣n, y∣ny∣n, z∣nz∣n ... 阅读全文
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You surely have never heard of this new planet surface exploration scheme, as it is being carried out in a project with utmost secrecy... 阅读全文
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Senior Pan fails in his discrete math exam again. So he asks Master ZKC to give him graph theory problems everyday. The task is simple... 阅读全文
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LsF is visiting a local amusement park with his friends, and a mirror room successfully attracts his attention. Inside the mirror room... 阅读全文