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public class Solution {
    public ArrayList<ArrayList<Integer>> threeSum(int[] num) {
        // Start typing your Java solution below
        // DO NOT write main() function
        ArrayList<ArrayList<Integer>> result = new ArrayList<ArrayList<Integer>>();
        if(num.length < 3)
            return result;
            
        Arrays.sort(num);
        for(int i = 0; i < num.length - 2 ; i ++){
            int first = num[i];
            int j = i + 1;
            int k = num.length - 1;
            while(j < k){
                int second = num[j];
                int third = num[k];
                if(second + third == -first){
                    ArrayList<Integer> solution = new ArrayList<Integer>();
                    solution.add(first);
                    solution.add(second);
                    solution.add(third);
                    result.add(solution);                    
                    while( ((j + 1) <= (num.length - 1)) && (num[j] == num[j + 1])) j ++;
                    j ++;
                    while( ((k - 1) >= 0) && (num[k] == num[k - 1])) k --;
                    k --;
                }
                
                else if(second + third < -first){
                    while( ((j + 1) <= (num.length - 1)) && (num[j] == num[j + 1])) j ++;
                    j ++;
                }
                
                else if(second + third > -first){
                    while( ((k - 1) >= 0) && (num[k] == num[k - 1])) k --;
                    k --;
                }
            }
            
            while( ((i + 1) <= (num.length - 1)) && (num[i] == num[i + 1])) i ++;
            j ++;
        
        }
    
        return result;
    }
}