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这个题好象一定只能是有向边

Posted by qrmajia at 2010-04-27 19:38:54 on Problem 3321
如果是无向边的话,根本就无法确定谁是谁的儿子,那么也就根本就无法计算结果
如果有无向边连A,B,查询A的时候到底要不要加B上的呢????

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