Day 7; Arrays.swift

import Foundation

guard let n = Int((readLine()?.trimmingCharacters(in: .whitespacesAndNewlines))!)
else { fatalError("Bad input") }

guard let arrTemp = readLine()?.replacingOccurrences(of: "\\s+$", with: "", options: .regularExpression) else { fatalError("Bad input") }

let arr: [Int] = arrTemp.split(separator: " ").map {
    if let arrItem = Int($0) {
        return arrItem
    } else { fatalError("Bad input") }
}

guard arr.count == n else { fatalError("Bad input") }

arr.reversed().forEach {
    print($0, terminator: " ")
}