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D. Lazy StudentStudent Vladislav came to his programming exam completely unprepared as usual. He got a question about some strange algorithm on a grap... 阅读全文
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C. Sorting Railway CarsAn infinitely long railway has a train consisting ofncars, numbered from1ton(the numbers of all the cars are distinct) and posi... 阅读全文
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A. Magic SpheresCarl is a beginner magician. He hasablue,bviolet andcorange magic spheres. In one move he can transform two spheresof the same colorin... 阅读全文