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Cows are such finicky eaters. Each cow has a preference for certain foods and drinks, and she will consume no others. Farmer John has cooked fabulous 阅读全文
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In Arcady's garden there grows a peculiar apple-tree that fruits one time per year. Its peculiarity can be explained in following way: there are n inf 阅读全文
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Anya and Kirill are doing a physics laboratory work. In one of the tasks they have to measure some value n times, and then compute the average value t 阅读全文
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The last stage of Football World Cup is played using the play-off system. There are n teams left in this stage, they are enumerated from 1 to n. Sever 阅读全文
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Two friends are on the coordinate axis Ox in points with integer coordinates. One of them is in the point x1 = a, another one is in the point x2 = b. 阅读全文