3Sum.java

class Solution {
    public List<List<Integer>> threeSum(int[] nums) {
        List < List < Integer >> result = new ArrayList < List < Integer >> ();
        for (int i = 0; i < nums.length; i++) {
            for (int j = i + 1; j < nums.length; j++) {
                for (int k = j + 1; k < nums.length; k++) {
                    if (nums[i] + nums[j] + nums[k] == 0 && (i!=j ||i!=k||j!=k)) {
                        List < Integer > triplet = new ArrayList < Integer > ();
                        triplet.add(nums[i]);
                        triplet.add(nums[j]);
                        triplet.add(nums[k]);
                        Collections.sort(triplet);
                        result.add(triplet);
                    }
                }
            }
        }
      // result = new ArrayList < List < Integer >> (new LinkedHashSet < List < Integer >> (result));
        return set;
        
       }
}