[프로그래머스] 최댓값 만들기 (2) (Swift)

import Foundation

func solution(_ numbers:[Int]) -> Int {
    
    var sortedNumbersArray = numbers.sorted(by:<)
    var minusArray: [Int] = []
    var plusArray: [Int] = []
    var minusMax = 0
    var plusMax = 0
    
    if numbers.count == 2{
        return numbers[0] * numbers[1]
    }

 func plusOrMinus(num: Int){
        if num < 0{
            minusArray.append(num)
        }
        else{
            plusArray.append(num)
        }
    }
    
    plusOrMinus(num: sortedNumbersArray[0])
    plusOrMinus(num: sortedNumbersArray[1])
    plusOrMinus(num: sortedNumbersArray[sortedNumbersArray.count - 1])
    
    if sortedNumbersArray.count > 3{
         plusOrMinus(num: sortedNumbersArray[sortedNumbersArray.count - 2])
    }
    
    if minusArray.count > 1{
        minusMax = minusArray[0] * minusArray[1]
    }
    
    if plusArray.count > 1 {
        plusMax = plusArray[plusArray.count - 1] * plusArray[plusArray.count - 2]
    }
    
    
    return minusMax > plusMax ? minusMax : plusMax
}