[프로그래머스] 두 개 뽑아서 더하기

import java.util.*;

class Solution {
    public ArrayList<Integer> solution(int[] numbers) {

        ArrayList<Integer> list = new ArrayList<>();
        
        for(int i=0; i<numbers.length; i++){
            for(int j=i+1; j<numbers.length; j++){
                if(!list.contains(numbers[i]+ numbers[j])){
                    list.add(numbers[i]+ numbers[j]);
                }
            }
        }
        Collections.sort(list);

        return list;
    }
}