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1730: [Usaco2005 dec]Barn Expansion 牛棚扩张 Description Farmer John has N (1 <= N <= 25,000) rectangular barns on his farm, all with sides parallel to th 阅读全文
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1719: [Usaco2006 Jan] Roping the Field 麦田巨画 Description Farmer John is quite the nature artist: he often constructs large works of art on his farm. To 阅读全文