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题目 The task is really simple: given N exits on a highway which forms a simple cycle, you are supposed to tell the shortest distance between any pair o 阅读全文
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题目 Eva is trying to make her own color stripe out of a given one. She would like to keep only her favorite colors in her favorite order by cutting off 阅读全文
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题目 Shopping in Mars is quite a different experience. The Mars people pay by chained diamonds. Each diamond has a value (in Mars dollars M$). When maki 阅读全文