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1718: [Usaco2006 Jan] Redundant Paths 分离的路径 Description In order to get from one of the F (1 <= F <= 5,000) grazing fields (which are numbered 1..F) t 阅读全文
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1731: [Usaco2005 dec]Layout 排队布局 Description Like everyone else, cows like to stand close to their friends when queuing for feed. FJ has N (2 <= N <= 阅读全文
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Sightseeing trip Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 8520 Accepted: 3200 Special Judge Description There is a travel agency in 阅读全文