[프로그래머스] 두 개 뽑아서 더하기
https://programmers.co.kr/learn/courses/30/lessons/68644
function solution(numbers) {
var answer = [];
var len = numbers.length
for(let i = 0; i < len; i++){
for(let j = i + 1; j < len; j++){
answer.push(numbers[i] + numbers[j])
}
}
var arr = [...new Set(answer.sort((a,b) => a-b))];
return arr;
}