A sudoku solver using Knuth's Algorithm X and dancing links data structure.
![] (https://raw.github.com/daogan/sudoku-solver/master/screenshot/Screenshot-1.png) ![] (https://raw.github.com/daogan/sudoku-solver/master/screenshot/Screenshot-2.png)
Solving a sudoku can be mapped to solving an Exact Cover Problem:
- Constraint 1: each cell must have a number filled.
- Constraint 2: each row must contain each number exactly once.
- Constraint 3: each column must contain each number exactly once.
- Constraint 4: each box must contain each number exactly once.
- Each has 9x9 = 81 constraints, total 81x4 = 324 constraints, use 324 columns to specify these constraints.
- Each Sudoku cell state can be specified by [Row, Col, Value], total 9x9x9 = 729 states, use 729 rows to specify these states.
In file config.py, Change the value of BOX_SIZE to get different dimensions of the sudoku you want to solve,
change the value of CHAR to set the cells' displaying characters.
Mouse hover to select cell, press number <19> or part of <az> to set cell's value,
press <SPACE> to solve the sudoku, press <r> to reset and <q> to quit.
Load pre-defined sudokus.
This content is released under the MIT license.
© 2012 Daogan Ao <[email protected]>
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