MST problem

Правка en1, от monyet, 2016-05-21 13:44:15

Hello, can you give me a hint on how to solve this problem? I read the editorial, but still can not solve it. 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)