public void printSudoku() {
        for (int i = 1; i <= countRow; i++) {
            for (int j = 1; j <= countRow; j++) {
                if (selectCellCoord(i, j).openValues.size() == 1)
                    System.out.print(selectCellCoord(i, j).openValues + " ");
                else System.out.print("[ ] ");
            }
            System.out.println();
        }
        System.out.println("---------------------------------");
    }