78. Subsets

 1 public class Solution {
 2     public List<List<Integer>> subsets(int[] nums) {
 3         List<List<Integer>> list = new ArrayList();
 4         
 5         List<Integer> nul = new ArrayList();
 6         list.add(nul);
 7         
 8         addSubsets(list, nul, 0, nums);
 9         
10         return list;
11     }
12     
13     public void addSubsets(List<List<Integer>> list, List<Integer> init, int location, int[] nums){
14         for(int i = location; i < nums.length; i++){
15             List<Integer> tmpList = new ArrayList();
16             
17             for(int j = 0; j < init.size(); j++)
18                 tmpList.add(init.get(j));
19                 
20             tmpList.add(nums[i]);
21             list.add(tmpList);
22             
23             addSubsets(list, tmpList, i + 1, nums);
24         }
25     }
26 }