Editorial for Another Contest 7 Problem 4 - Team Assignments

Remember to use this editorial only when stuck, and not to copy-paste code from it. Please be respectful to the problem author and editorialist.

Submitting an official solution before solving the problem yourself is a bannable offence.

The graph structure does not matter - there are K(K-1)^{N-1} ways to K-color a tree with N vertices.

To count the number of such colorings that use all K colors, use inclusion-exclusion.


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