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题目有点难懂.

Posted by ecjtuwf at 2008-10-02 21:25:38 on Problem 3259
太弱了, 读了半天, 也没搞懂, 好像是这个意思.
   Farmer John 有F 个Farm, 每个Farm 有N 个田地, 田地之间相连, 有M 条路, 田地
之间走动有时间花费, 但是他有W 个虫洞, 其时间花费是负值, 有时间倒流的意思. 问:
是否可以找到一块空地, 从这里出发, 经过田地或虫洞, 回到原点, 并使得时间花费为负值, 
即在出之前就能遇到自己.

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