백준 1193 분수찾기 swift

let line = readLine() ?? ""
var n = Int(line) ?? 0
var count = 1
while true {
    n = n - count
    if n <= 0 {
        break
    }
    count = count + 1
}
if count % 2 == 1 {
    print("\(-n+1)/\(n+count)")
} else {
    print("\(n+count)/\(-n+1)")
}