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居然让你暴力过了= = 确实是树，不是无环图

Posted by xuhaoran510 at 2011-09-15 18:11:15 on Problem 3237
In Reply To:貌似不是树，是一个无环图 Posted by:D1000107 at 2011-09-15 18:02:42 
> rt，伤不起.....
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