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北京大学《ACM/ICPC大学生程序设计竞赛训练》暑期课面向全球招生!

it's a tree...

Posted by frkstyc at 2005-10-03 17:38:08 on Problem 2631
In Reply To:按题意理解,是不是任意两村只有一条路,且不存在回路? Posted by:maths at 2005-10-03 16:58:50


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