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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Auto comment: topic has been updated by monyet (previous revision, new revision, compare).
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Thank you so much. I have seen that though. But I want to know how to solve this problem using this approach.