子集2

class Solution {    public List
     
      
       > subsetsWithDup(int[] nums) {        Arrays.sort(nums);        int len = nums.length;        List
       
        
         > result = new ArrayList
         
          
           >(); int[] index = new int[len]; index[0] = 1; for(int i=1;i
           
            > result, int[] index) { if(len == 0) { List
            
              element = new ArrayList<>(); result.add(element); }else { subsetsWithDup2(nums, len - index[len-1], result,index); int size = result.size(); for(int i=0;i
             
               tempElement = result.get(i); for(int j=0;j