📚 Problem

없는 숫자 더하기

💫 Solve

import Foundation

func solution(_ numbers:[Int]) -> Int {
    var total : Int = 0
    for i in numbers {
        total += i
    }
    
    return 45 - total
}

🩺 Another Solution

import Foundation

func solution(_ numbers:[Int]) -> Int {
    return 45-numbers.reduce(0, +)
}