W--o_o--W's blog

By W--o_o--W, history, 12 months ago, In English,

Hello,

I came up with the following problem but I'm not sure if it is possible to solve it in less than O(n2), any ideas?

You are given a weighted tree with n nodes and you are allowed to swap the costs (1 ≤ cost ≤ n) of two edges at most once such that the sum of all paths in the tree is maximum.

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