백준 - 19532번 (Swift)

코드(런타임 에러)

var arr = readLine()!.split(separator: " ").map{Int($0)!}
var firstX = arr[0]
var secondX = arr[3]
var firstY = arr[1]
var secondY = arr[4]
var firstResult = arr[2]
var secondResult = arr[5]
var x = 0
var y = 0

if firstX + secondX == 0  {
    y = (firstResult + secondResult) / (firstY + secondY)
    x = (firstResult + ((firstY * y) * -1)) / firstX
    
    print(x, terminator: " ")
    print(y)
} else if firstY + secondY == 0 {
    x = (firstResult + secondResult) / (firstX + secondX)
    y = (firstResult + ((firstY * y) * -1)) / firstX
    print(x, terminator: " ")
    print(y)
} else {
    let a = firstX
    let b = secondX
    
    firstX *= b
    firstY *= b
    firstResult *= b
    secondX *= a
    secondY *= a
    secondResult *= a
    
    if firstX + secondX == 0  {
        y = (firstResult + secondResult) / (firstY + secondY)
        x = (firstResult + ((firstY * y) * -1)) / firstX
        
        print(x, terminator: " ")
        print(y)
    } else {
        y = (firstResult + (secondResult * -1)) / (firstY + (secondY * -1))
        x = (firstResult + ((firstY * y) * -1)) / firstX
        print(x, terminator: " ")
        print(y)
    }
}

나름 논리적으로 풀어보려했지만 47%에서 런타임 에러가 떴다..
왜 뜨는지 아시는 분 알려주세요..

코드(완전탐색)

let arr = readLine()!.split(separator: " ").map{Int($0)!}
let a = arr[0], b = arr[1], c = arr[2], d = arr[3], e = arr[4], f = arr[5]

OUTTER: for i in -999...999 {
    for j in -999...999 {
        let result = a*i + b*j
        let result2 = d*i + e*j
        
        if result == c && result2 == f {
            print(i, terminator: " ")
            print(j)
            break OUTTER
        }
    }
}

회고

• 완전탐색을 사용하는 법도 생각을 해야겠다
• 문제 조건을 잘 보고 완전탐색을 생각해야겠다