getRamdom - BINGO

func getRamdom(_ from: Int, toN: Int, _ k:Int)-> [Int]{
    var res = [Int]()
    var to = toN
    var map = [Int: Int]()
    while res.count < k{
        let next = Int.random(in: from ... to)
        if let number = map[next]{
             res.append(number)
        }else{
            res.append(next)
        }
        map[next] = to
        to -= 1
    }
    return res
}