3x3 Sudoku puzzle and simple recursive solver
A textfile with the following format:
0 0 6 0 3 0 0 0 0
0 0 0 2 0 1 8 0 5
0 0 8 7 5 4 0 2 0
8 4 0 3 0 0 0 5 0
0 0 9 0 0 2 1 0 0
0 0 2 9 0 0 7 0 6
0 9 0 0 4 0 3 6 0
0 6 5 0 0 7 0 0 4
7 8 4 0 0 0 0 0 9
A blank square is represented by a 0.
Prints the unsolved puzzle, and the prints solution if it is possible. Otherwise, prints False.
0 0 6 | 0 3 0 | 0 0 0
0 0 0 | 2 0 1 | 8 0 5
0 0 8 | 7 5 4 | 0 2 0
------|-------|------
8 4 0 | 3 0 0 | 0 5 0
0 0 9 | 0 0 2 | 1 0 0
0 0 2 | 9 0 0 | 7 0 6
------|-------|------
0 9 0 | 0 4 0 | 3 6 0
0 6 5 | 0 0 7 | 0 0 4
7 8 4 | 0 0 0 | 0 0 9
5 2 6 | 8 3 9 | 4 7 1
4 7 3 | 2 6 1 | 8 9 5
9 1 8 | 7 5 4 | 6 2 3
------|-------|------
8 4 7 | 3 1 6 | 9 5 2
6 5 9 | 4 7 2 | 1 3 8
1 3 2 | 9 8 5 | 7 4 6
------|-------|------
2 9 1 | 5 4 8 | 3 6 7
3 6 5 | 1 9 7 | 2 8 4
7 8 4 | 6 2 3 | 5 1 9