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1004. Counting Leaves (30) A family hierarchy is usually presented by a pedigree tree. Your job is to count those family members who have no child. In 阅读全文
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1003. Emergency (25) As an emergency rescue team leader of a city, you are given a special map of your country. The map shows several scattered cities 阅读全文
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标题：风险度量X星系的的防卫体系包含 n 个空间站。这 n 个空间站间有 m 条通信链路，构成通信网。两个空间站间可能直接通信，也可能通过其它空间站中转。对于两个站点x和y (x != y), 如果能找到一个站点z，使得：当z被破坏后，x和y无法通信，则称z为关于x,y的关键站点。显然，对于给定的两 阅读全文
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HDU1242 广度优先遍历+优先级队列 阅读全文
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深度偶优先遍历+剪枝 阅读全文