MST problem

Правка en2, от monyet, 2016-05-21 13:45:19

Hello, can you give me a hint on how to solve this problem? I read the editorial, but still can not solve it. According to the editorial, we have to "prune the graph". I don't know how to do that. Thanks so much.

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en2 Английский monyet 2016-05-21 13:45:19 87
en1 Английский monyet 2016-05-21 13:44:15 180 Initial revision (published)