int[] nums = { 4, 3, 2, 5, 6, 7, 3, 4, 2, 1 }; // Using HashSet instead of LinkedHashSet if order doesn't matter.
* You are given an integer n. There is an undirected graph with n vertices, numbered from 0 to n - 1. You are given a 2D integer array edges * where edges[i] = [ai, bi] denotes that there exists an ...