$ python3 src/sudoku/sudoku.py -f sample_boards/very_hard_3
Crunching numbers...
7 8 4 | 2 9 5 | 3 1 6
2 6 9 | 8 1 3 | 4 5 7
3 5 1 | 4 7 6 | 9 8 2
---------------------
4 3 2 | 7 6 8 | 1 9 5
8 9 6 | 5 2 1 | 7 4 3
5 1 7 | 3 4 9 | 2 6 8
---------------------
9 7 3 | 6 5 4 | 8 2 1
1 2 5 | 9 8 7 | 6 3 4
6 4 8 | 1 3 2 | 5 7 9
Values set: 158097
Time taken: 1.85s
$ python3 src/sudoku/sudoku.py < sample_boards/very_hard_3
Enter the Sudoku grid to solve:
Crunching numbers...
7 8 4 | 2 9 5 | 3 1 6
2 6 9 | 8 1 3 | 4 5 7
3 5 1 | 4 7 6 | 9 8 2
---------------------
4 3 2 | 7 6 8 | 1 9 5
8 9 6 | 5 2 1 | 7 4 3
5 1 7 | 3 4 9 | 2 6 8
---------------------
9 7 3 | 6 5 4 | 8 2 1
1 2 5 | 9 8 7 | 6 3 4
6 4 8 | 1 3 2 | 5 7 9
Values set: 158097
Time taken: 1.80s
$ python3 src/sudoku/sudoku.py
Enter the Sudoku grid to solve:
080000010
060003000
301070900
402008090
000500700
010000000
903004020
000080004
600000000
Crunching numbers...
7 8 4 | 2 9 5 | 3 1 6
2 6 9 | 8 1 3 | 4 5 7
3 5 1 | 4 7 6 | 9 8 2
---------------------
4 3 2 | 7 6 8 | 1 9 5
8 9 6 | 5 2 1 | 7 4 3
5 1 7 | 3 4 9 | 2 6 8
---------------------
9 7 3 | 6 5 4 | 8 2 1
1 2 5 | 9 8 7 | 6 3 4
6 4 8 | 1 3 2 | 5 7 9
Values set: 158097
Time taken: 1.73s