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有点想不通,哪位大神解释下

Posted by Seen at 2012-03-20 10:07:18 on Problem 3756
本来把能到达某个(无法到达终点的点)的点设为(无法到达终点),就算他能到达其他有效点。到达无法到达的点,就是期望为无穷大的点,那他自身的期望也是无穷大吧?。。后面改了下这里,改为只要能到达一个有效点那他就算可达的,就过了。。。是不是有特殊数据,可以使得他一些转移是在死循环绕圈,然后某个转移是到达终点的?

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