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3Sum

Given an array nums of n integers, are there elements a , b , c in nums such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero. Note: The solution set must not contain duplicate triplets. Example: Given array nums = [-1, 0, 1, 2, -1, -4], A solution set is: [ [-1, 0, 1], [-1, -1, 2] ]   class Solution {     public List<List<Integer>> threeSum(int[] nums) {         if (nums.length < 3) return new ArrayList<>();         Arrays.sort(nums);         Set<List<Integer>> triplet= new HashSet<>();         for (int i = 0; i < nums.length - 2; i++) {             int j = i + 1;             int k = nums.length - 1;  ...