相关链接
题目传送门：http://www.lydsy.com/JudgeOnline/problem.php?id=4006
神犇题解：http://www.cnblogs.com/lidaxin/p/5301180.html
斯坦纳树相关：http://endlesscount.blog.163.com/blog/static/821197872012525113427573/
解题报告
带关键点的最小生成树
好像在梦里见过的样子……
今天看到这个题居然想了很久这应该怎么做……
就是搞一个斯坦纳树就可以啦！
就是状压DP用SPFA的方式来更新
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