function solution(numbers) {
    var answer = [];
    const sums=new Set();
    numbers.sort((a,b)=>a-b);
    for(let i=0;i<numbers.length;i++){
        for(let j=i+1;j<numbers.length;j++){
            sums.add(numbers[i]+numbers[j])
        }
    }
    answer=Array.from(sums);
    answer.sort((a,b)=>a-b)
    return answer;
}
문제를 잘읽자
정렬해야됨.