摘要：
N planets are connected by M bidirectional channels that allow instant transportation. It's always possible to travel between any two planets through 阅读全文
posted @ 2017-10-19 18:16
nimphy
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摘要：
There are some locations in a park, and some of them are connected by roads. The park manger needs to build some railways along the roads, and he woul 阅读全文
posted @ 2017-10-19 18:15
nimphy
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