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1629: [Usaco2007 Demo]Cow Acrobats Description Farmer John's N (1 <= N <= 50,000) cows (numbered 1..N) are planning to run away and join the circus. T 阅读全文
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1634: [Usaco2007 Jan]Protecting the Flowers 护花 Description Farmer John went to cut some wood and left N (2 <= N <= 100,000) cows eating the grass, as 阅读全文
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1651: [Usaco2006 Feb]Stall Reservations 专用牛棚 Description Oh those picky N (1 <= N <= 50,000) cows! They are so picky that each one will only be milked 阅读全文
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1679: [Usaco2005 Jan]Moo Volume 牛的呼声 Description Farmer John has received a noise complaint from his neighbor, Farmer Bob, stating that his cows are m 阅读全文