rioshen

public class Backtrack {
    public static List<List<Object>> backtrack(int[] A) {
        // Set up a list of list to hold all possible solutions
        List<List<Object>> result = new LinkedList<List<Object>>();
        if (A == null || A.length == 0) {
            return result;
        }

        // As we need to recursively generate every solution,
        // a variable is needed to store single solution.