upc-2021个人训练赛第27场 D: Values（思维+并查集）思路：代码：
问题 D: Values时间限制: 1 Sec 内存限制: 128 MB题目描述Given is a simple undirected graph with N vertices and M edges. The i-th edge connects Vertex ci and Vertex di. Initially, Vertex i has the value ai written on it. You want to change the values on Vertex 1, …
