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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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1620: [Usaco2008 Nov]Time Management 时间管理 Description Ever the maturing businessman, Farmer John realizes that he must manage his time effectively. He 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