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给个思路,如何判断那些墙多余?高人现身!

Posted by piratelzs at 2007-03-17 10:09:01 on Problem 1024
我现在的思路是用dfs寻路,并尽量不走原路,<得出是否为唯一最短路径>
但是如何确定那些墙多余没有更好的办法,请哪位指点一二.

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