3517. The longest athletic track
http://acm.tju.edu.cn/toj/showp3517.html
After a long time of algorithm training, we want to hold a running contest in our beautiful campus. Because all of us are curious about a coders's fierce athletic contest,so we would like a more longer
athletic track so that our contest can last more .
In this problem, you can think our campus consists of some vertexes connected by roads which are undirected and make no circles, all pairs of the vertexes in ou......
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