private var selectedContestIndex: Int = -1

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        guard let dst = segue.destination as? ContestTrackListViewController,
            selectedContestIndex >= 0 else {return}

        dst.contestId = contests[selectedContestIndex].id
    }

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        tableView.deselectRow(at: indexPath, animated: false)
        selectedContestIndex = indexPath.item
        performSegue(withIdentifier: "contestTrackList", sender: self)
    }
}