class Solution {
public:
    vector<vector<int>> threeSum(vector<int>& nums) {
        sort(nums.begin(), nums.end());
        set<vector<int>> res;
        for(int i=0;i<nums.size();i++){
            int l = i+1, r = nums.size()-1;

            while(l<r){
                int sum = nums[i]+nums[l]+nums[r];

                if(sum<0){
                    l++;
                }else if(sum>0){
                    r--;
                }else{
                    res.insert({nums[i], nums[l], nums[r]});
                    l++;
                    r--;
                }
            }
        }

        return vector<vector<int>>(res.begin(), res.end());
    }
};

class Solution {
public:
    vector<vector<int>> threeSum(vector<int>& nums) {
        sort(nums.begin(), nums.end());
        set<vector<int>> res;
        for(int i=0;i<nums.size();i++){
            if(i != 0 && nums[i] == nums[i-1]) continue;

            int l = i+1, r = nums.size()-1;

            while(l<r){
                int sum = nums[i]+nums[l]+nums[r];

                if(sum<0){
                    l++;
                }else if(sum>0){
                    r--;
                }else{
                    res.insert({nums[i], nums[l], nums[r]});
                    l++;
                    r--;
                }
            }
        }

        return vector<vector<int>>(res.begin(), res.end());

    }
};