Method threeSum

15 3sum/15 3-Sum.java:6–19

(int[] nums)

class Solution {
    public List<List<Integer>> threeSum(int[] nums) {
        
        Arrays.sort(nums);
        List<List<Integer>> result = new ArrayList<>();
        
        for (int i = 0; i<nums.length && nums[i] <=0; i++){
            if (i == 0 || nums[i] != nums[i-1]){
                twoSum2(nums, i, result);
            }
        }
        
        return result;
        
    }
    
    void twoSum2(int[] nums, int i, List<List<Integer>> result){
        int left = i+1;