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Paths and Trees time limit per test3 seconds memory limit per test256 megabytes Little girl Susie accidentally found her elder brother's notebook. She 阅读全文
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Breaking Good time limit per test 2 seconds memory limit per test 256 megabytes Breaking Good is a new video game which a lot of gamers want to have. 阅读全文
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[Usaco2012Jan]Bovine Alliance Time Limit: 2 Sec Memory Limit: 128 MB Description Bessie and her bovine pals from nearby farms have finally decided tha 阅读全文
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The Child and Toy time limit per test1 second On Children's Day, the child got a toy from Delayyy as a present. However, the child is so naughty that 阅读全文
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最优贸易 题目描述 C C 国有 n n 个大城市和 mm 条道路,每条道路连接这 nn 个城市中的某两个城市。任意两个城市之间最多只有一条道路直接相连。这 mm 条道路中有一部分为单向通行的道路,一部分为双向通行的道路,双向通行的道路在统计条数时也计为 1 1 条。 C C 国幅员辽阔,各地的资源 阅读全文