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...这样不对...能留在自己棚里的不一定要留下来

Posted by ArXoR at 2006-12-08 12:41:14 on Problem 2391
In Reply To:这题我这么搞为什么不对? Posted by:RoBa at 2006-12-07 19:32:57
> floyd预处理出所有点对的最短路。二分答案k,把每个牛棚看作一个点,构造一个网络,将S和当前牛数>可容纳牛数(设差为delta)的牛棚连一条容量为delta的边,将所有当前牛数<可容纳牛数的点到T连一条容量为delta的边,这两种点之间的最短距离如果不大于k就连一条容量为正无穷的边。求最大流,看能否填满所有从S发出的边。
> 
> 要是TLE我就认了,为什么WA捏~~

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