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Description:A subsequence of a given sequence is the given sequence with some elements (possible none) left out. Given a sequence X = another sequenc... 阅读全文
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Description：The inversion number of a given number sequence a1, a2, ..., an is the number of pairs (ai, aj) that satisfy i aj.For a given sequence of... 阅读全文
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Description：As you know, all the computers used for ACM contests must be identical, so the participants compete on equal terms. That is why all these ... 阅读全文
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10480 Sabotage:The regime of a small but wealthy dictatorship has been abruptly overthrown by an unexpected rebellion.Because of the enormous disturba... 阅读全文