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Problem description Vanya and his friends are walking along the fence of height h and they do not want the guard to notice them. In order to achieve t 阅读全文
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Problem description Xenia lives in a city that has n houses built along the main ringroad. The ringroad houses are numbered 1 through n in the clockwi 阅读全文
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Problem description Sheldon, Leonard, Penny, Rajesh and Howard are in the queue for a "Double Cola" drink vending machine; there are no other people i 阅读全文
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Problem description Fox Ciel starts to learn programming. The first task is drawing a fox! However, that turns out to be too hard for a beginner, so s 阅读全文