[Swift] 두개 뽑아서 더하기

import Foundation

func solution(_ numbers:[Int]) -> [Int] {
    
    var set = Set<Int>()
    
    for i in 0..<numbers.count {
        for j in i+1..<numbers.count{
            set.insert(numbers[i] + numbers[j])
        }
    }
    
    return Array(set).sorted()
}