I once got humiliated by a hard sudoku on the screen at the back of an airplane seat. I built this program to avenge me. It does it well.
Write your sudoku problem in sudoku_input.txt.
An example is provided for you.
You may then call stack run and observe the result in the standard output.
Any sudoku with a solution will be solved, any sudoku without one will be
reported as such by this program. Easy sudokus are solved instantly,
very hard ones in a few seconds.
This requires Stack, the main Haskell package manager/build tool.
Note: Your first build might require an internet connection to download library deps.
Note 2: To avoid downloading a whole compiler, you might want to bump the compiler version number in stack.yaml to one that you have installed locally.
This is licensed under the Creative Commons Zero license. See the LICENSE file.