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the organizing committee can only afford to set the system up such that there will be only one way to transfer information from one university to another without passing the same university twice.

Posted by 1083_3 at 2006-12-09 19:46:14 on Problem 3140
In Reply To:删去一棵树的某条边, 使得两棵树的结点数之差最小 Posted by:sunmoonstar at 2006-12-09 16:50:25
这句是没用的?

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