Java 6ms beats 90% solution

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    public class Solution {
    	List<List<Integer>> res;
    	public List<List<Integer>> combine(int n, int k) {
    		res = new ArrayList<List<Integer>>();
    		helper(new ArrayList<Integer>(), 1, n, k);
    		return res;
    	private void helper(List<Integer> list, int i, int n, int k) {
    		if (i>n-k+1) return;
    		if (k == 0) {res.add(new ArrayList<Integer>(list)); return;}
    		for (int j = i; j <= n; j++) {
    			helper(list, j+1, n, k-1);

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