题目大意 题目链接 给定一张\(n\)个点\(m\)条边的无向图\(G=(V,E)\)。每个点\(u\)有一个点权\(a_u\)。令\(S_u=\{a_v|(u,v)\in E\}\)。令\(F_ ...

CF1446D1, D2 Frequency Problem 题目来源：Codeforces, Codeforces Round #683 (Div. 1, by Meet IT)，CF1446D1 ...