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为什么加边顺序反了会WA

Posted by MaxMercer at 2017-07-14 11:48:21 on Problem 1895
先加这一层的i与下一层的i+n,再加这一层的u连向下一层的v的边就是WA.反过来就AC。最后建出来的图不应该一样吗

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