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Problem DescriptionAt the entrance to the university, there is a huge rectangular billboard of size h*w (h is its height and w is its width). The boar... 阅读全文
posted @ 2016-01-03 17:24
DMoon
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Problem DescriptionThe inversion number of a given number sequence a1, a2, ..., an is the number of pairs (ai, aj) that satisfy i aj.For a given sequ... 阅读全文
posted @ 2016-01-03 16:29
DMoon
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