Ok, forget about all the complex algorithms used to solve Sudoku. I'm writing a simple solver on Java to solve simple Sudoku games. The idea of this method is very common, so I think everyone knows it already. I'm also surprised that I can't get it done.
The method is to go over every cell on the board and fill in all the cells that have only 1 possibility. Repeat until every cell is filled. Very simple, and here is my code, return int number of fillings can be made:
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I don't see anything wrong with this code except for the inability to detect that you can't solve the puzzle. The difficulty of the sudokus you are going to be able to solve is obviously dependent on your implementation of getPossible, which isn't posted.
Keep in mind that even "very easy" sudokus are likely to include portions where you have to analyze multiple cells simultaneously, if you can't do this in getPossible you won't be able to solve much of anything:
When people over 50 engage in thought games like sudoku and crossword puzzles, their brains function better, according to a study in the International Journal of Geriatric Psychiatry. In fact, study participants who worked such puzzles more than once a day had superior cognitive performance in key areas, such as reasoning, attention and memory.
A supposedly "world's most difficult Sudoku"was designed by the Finnish mathematician Arto Inkala. For this sudoku the methodconsiders 18936 different grids while solving the puzzle, but it still solves in lessthan a second on my machine (a MacBook Pro with an Apple M1 Pro chip).
The Art of Computer Programming, Volume 4B, Section 7.2.2.1, alsoconsiders sudoku puzzles along with a method for solving them and otherinteresting information on these puzzles and backtracking in general.
So far I have not faced any sudokus this script can not solve. Please do write to report bugs or unsolved sudokus. The code was slow but I updated it to work faster. I have also included a 'clear' button for operational ease and a few more bug fixes.
The GUI can be run with sudokuSolver.m
If anyone wants to skip the GUI and use the basic code only, then comment the first line and uncomment the next few lines in sudokuB.m file and run the script. A file selection window will pop up where CSV format file can be selected as input. Few sample files are provided here.
While having some programming experience can be helpful, it is not a requirement for creating a Sudoku game in C#. With the abundance of online resources and tutorials available, even beginners can learn the basics of C# and develop a simple Sudoku game with some practice and dedication.
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Sudoku is a brain challenging number game, played on a 9x9 sudoku board. The sudoku board is broken down into nine 3x3 squares. The object of the sudoku game is simple. Every row, column, and 3x3 box in the sudoku board must contain the digits 1 through 9 only once! As the difficulty progresses, the sudoku game becomes harder, and you'll have to employ more advanced and strategic logic to solve the puzzles.
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From how you described the school you went to, I can say that the education system in Saudi Arabia is the same. We don't have serious computer or programming classes. In best cases they would teach you how to use MS Office and that's it. I started learning programming earlier in my last year of elementary school. It was all self-learning. I kept studying and implementing some simple code using PHP and MySQL. A few years later I lost interest and gradually moved away from programming.
Once I ran into your GitHub account and I saw the sudoku repo I didn't open it though because I don't like spoilers hahaha so I decided to make my own sudoku solver that like your first version only solve easy ones...I tested it using the Gnome sudoku from ubuntu 14.04 and It solves easy and medium level of difficultly this is the repo github.com/lmbarr/sudoku-solver
Amazing, the sudoku part almost exactly mirrors my experience.
I first wrote it in javascript, with sets of possible numbers for every cell and human-like non-destructive transforms being applied (only answers we are sure about). There were quite a few different transforms, because I picked a modified version of Sudoku which had these additional blob sum constraints, which were interesting because they were indeed sums and not sets of the [1,9] range.
For the UI, it used Vue, but really the renderer was mostly handwritten svg. It solved the lesser difficulties, but then I got bored.
Later, I stumbled upon someone quoting the backtracking algorithm as described in wikipedia. So I implemented it in Rust, with the additional constraints. The first time I wrote it, it solved them all in negligible time. I also tried it 3x4 and 4x4 boards. 4x4 gave noticeable time, and anything above 4x4 took too long to run.
Perhaps applying human-like transforms is computationally valuable at bigger board sizes to reduce the iteration space dramatically.
Maybe I'll still port those, or make the rust code an API or a WASM embed to the UI. Probably not though.
Another one! I wasn't given a Sudoku solver to do as part of a class (I trained in engineering), but have done one recently simply because it's really interesting. Pretty sure this one is efficient (github.com/rantydave/sudoku), took a lot longer than a couple of hours :)
Not saying that the code is inefficient, but I've created an algorithm which will solve the sudoku puzzle like we humans do (i.e. there would be no hit and trial of numbers). I wanted to make my own sudoku puzzle and solve it, but the thing is I couldn't make the question set. Whenever my algorithm would finish placing the numbers, it always turned out that a number was present twice in its undesired area. Help anyone?
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We've got lots more for you, so don't slow down! Keep training your brain and having fun with our high quality printable puzzle book. It includes 60 easy sudoku and their solutions and is available for immediate download. Even better, you can have a peek inside before you decide to purchase.Easy Sudoku Puzzles For You:
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Jigsaw Sudokus(function(d, s, id) {var js, fjs = d.getElementsByTagName(s)[0];if (d.getElementById(id)) return;js = d.createElement(s); js.id = id;js.src = "//forms.aweber.com/form/46/1425219846.js";fjs.parentNode.insertBefore(js, fjs);}(document, "script", "aweber-wjs-liisxt8w4")); Brain Teasers
Candidate solutions will be converted to code and run using a script(Mira-public/manifold-sudoku (github.com)). You are not required to interact with this script when submitting a solution, but @Mira will attempt to use it to judge your solution so it may help in understanding the format.
For complex tasks that require exploration or strategic lookahead, traditional or simple prompting techniques fall short. Yao et el. (2023) and Long (2023) recently proposed Tree of Thoughts (ToT), a framework that generalizes over chain-of-thought prompting and encourages exploration over thoughts that serve as intermediate steps for general problem solving with language models.
There are quite some variations in the Sudoku layouts, but we feel that the simple 9 by 9 game is the most effective! For beginning players, or young kids, we would advice the easier 4 by 4 or 6 by 6 variations! Some people even play 16 by 16 games, but these are too difficult for most of us (they are for me!). ff782bc1db
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