bool lab4::rekurencja(const chess_mail_problem & problem, vector<int>& envelope_colors, int number_of_colors, int row)
{
	if (row-1 == envelope_colors.size() && check_envelope_colors(problem, envelope_colors, number_of_colors))
		return true;
	for (int color =0;color<number_of_colors;color++)
	{
		envelope_colors[row] = color;
		if (rekurencja(problem, envelope_colors, number_of_colors, row + 1))
			return true;
		envelope_colors[row] = 0;
	}
	return false;
}