3786. Total Sum of Interaction Cost in Tree Groups

You are given an integer n and an undirected tree with n nodes numbered from 0 to n - 1. This is represented by a 2D array edges of length n - 1, where edges[i] = [ui, vi] indicates an undirected edge between nodes ui and vi. You are also given an integer array group of length n, where group[i] denotes the group label assigned to node i. - Two nodes u and v are considered part of the same group