void lista::pokaz()
{
    cout << "===================================" << endl;
    for (int i = 0; i <= obecny_poziom - 1; i++)
    {
        wezel* tmp = pierwszy->next[i];
        cout << "Poziom " << i << ": ";
        while (tmp != NULL)
        {
            cout << tmp->klucz << " ";
            tmp = tmp->next[i];
        }
        cout << endl;
    }
}