This is a very fast sudoku solver that solves most sudokus under 1 millisecond.
Download the latest release of Sudoku-Solver, and run it. Alternatively, you can run the Makefile to build from source.
Feed this program your sudoku from stdinput. Blank cells has to be replaced by either 0 or .. The program will discard all other characters and wait until 81 valid inputs (for 81 cells of your sudoku) have been provided.
Let us solve the following sudoku with Sudoku-Solver.
+-------+-------+-------+
| 1 . . | 9 2 . | . . . |
| 5 2 4 | . 1 . | . . . |
| . . . | . . . | . 7 . |
+-------+-------+-------+
| . 5 . | . . 8 | 1 . . |
| . . . | . . . | . . . |
| 4 . 2 | 7 . . | . 9 . |
+-------+-------+-------+
| . 6 . | . . . | . . . |
| . . . | . 3 . | 9 4 5 |
| . . . | . 7 1 | . . 6 |
+-------+-------+-------+
Note: The given sudoku must have at least one solution.
1 . . 9 2 . . . .
5 2 4 . 1 . . . .
. . . . . . . 7 .
. 5 . . . 8 1 . .
. . . . . . . . .
4 . 2 7 . . . 9 .
. 6 . . . . . . .
. . . . 3 . 9 4 5
. . . . 7 1 . . 6
+-------+-------+-------+
| 1 7 8 | 9 2 6 | 4 5 3 |
| 5 2 4 | 3 1 7 | 8 6 9 |
| 9 3 6 | 8 4 5 | 2 7 1 |
+-------+-------+-------+
| 6 5 7 | 2 9 8 | 1 3 4 |
| 8 9 3 | 1 6 4 | 5 2 7 |
| 4 1 2 | 7 5 3 | 6 9 8 |
+-------+-------+-------+
| 3 6 5 | 4 8 9 | 7 1 2 |
| 7 8 1 | 6 3 2 | 9 4 5 |
| 2 4 9 | 5 7 1 | 3 8 6 |
+-------+-------+-------+
Execution time: 0.000593 s
This software is published under GPL version 3. See the LICENSE for details.