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BZOJ1579[Usaco2009 Feb]Revamping Trails 道路升级 分层图最短路

题目链接:http://www.lydsy.com/JudgeOnline/problem.php?id=1579

分析:

最短路。用dijkstra算法。然而spfa会被卡。

将整个图复制成k+1层.然后优先队列优化dijkstra。

 

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