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3126: [Usaco2013 Open]Photo Description Farmer John has decided to assemble a panoramic photo of a lineup of his N cows (1 <= N <= 200,000), which, as 阅读全文
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KPSUM - The Sum One of your friends wrote numbers 1, 2, 3, ..., N on the sheet of paper. After that he placed signs + and - between every pair of adja 阅读全文
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2621: [Usaco2012 Mar]Cows in a Skyscraper Description [Mark Gordon, Neal Wu, Fatih Gelgi, 2012] A little known fact about Bessie and friends is that t 阅读全文
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HIGH - Highways In some countries building highways takes a lot of time... Maybe that's because there are many possiblities to construct a network of 阅读全文
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Problem Description During his six grade summer vacation, xiaoxin got lots of watermelon candies from his leader when he did his internship at Tencent 阅读全文
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The Company Dynamic Rankings has developed a new kind of computer that is no longer satisfied with the query like to simply find the k-th smallest num 阅读全文
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Life Forms Description You may have wondered why most extraterrestrial life forms resemble humans, differing by superficial traits such as height, col 阅读全文