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疑问 To communicate from barn 1 to barn 3, lines must be laid from barn 1 to barn 2 and also from barn 2 to barn 3.

Posted by Jayida at 2004-10-26 18:09:44 on Problem 1944
这是不是说 假如N=10 To communicate from barn 1 to barn 10, 
必须1-2,2-3,.....9-10 ?

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