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顶LZ,DAG中肯定有出度为0的点,否则必有环。所以出题人是sb

Posted by jiangke at 2010-08-21 19:25:08 on Problem 2553
In Reply To:这题bottom不会出现空的情况 Posted by:crbtmac at 2010-03-03 21:30:24


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