public static String example2() { int N = 10; // QuickFindUF qf = new QuickFindUF(N); QuickUnion qf = new QuickUnion(N); qf.union(4, 3); qf.union(3, 8); qf.union(6, 5); qf.union(9, 4); qf.union(2, 1); return qf.toString(); }