It does this by combining Norvig’s solver with a Convolutional Neural Network that can read pictures of numbers. This program solves and overlays solutions on pictures of unsolved Sudokus in real time. Raghav Virmani’s augmented reality solver is very cool. For example, he stores the board as a dictionary instead of a 9x9 array. However, I found his structure unintuitive. I used his set of 95 hard puzzles and 11 hardest puzzles to test my code. He uses a more comprehensive search and constraint propagation strategy and provides a thorough analysis with multiple puzzles. Her code however cannot solve hard puzzles because it only follows a simple constraint propagation strategy. I liked the overall structure of her code, and used it to refactor some of mine. There are two articles I would like to mention that were particularly helpful. I tackled this problem by myself, before comparing it to other online solvers. Other solversĪfter a few days of manually playing Sudoku, I naturally decided to write a solver for it. But all are remarkably easy to solve with computers. These puzzles range in difficulty, and some can be surprisingly hard to solve by hand. The goal of Sudoku is to full a 9x9 grid where each row, column and 3x3 region contains each of the numbers from 1 to 9. “Sudoku” is Japanese for “single number”. Introduction A 17-clue Sudoku puzzleĪccording to Wikipedia, this popular brain teaser puzzle rose to prominence in 2004. Also head over to his own website for a tutorial on Eel.Īs an example of the UI, here is the solution for the 13 March 2021 NY Time’s Hard puzzle: solution. You can download the solver and UI code from my GitHub repository. Update 13-03-2021: Erfan Paslar made a neat user interface for my solver using JavaScript and the Eel Python package. Even the most challenging Sudoku puzzles can be quickly and efficiently solved with depth first search and constraint propagation. txt file is free by clicking on the export iconĬite as source (bibliography): Sudoku Solver on dCode.This post describes a Sudoku solver in Python. The copy-paste of the page "Sudoku Solver" or any of its results, is allowed (even for commercial purposes) as long as you cite dCode!Įxporting results as a. Except explicit open source licence (indicated Creative Commons / free), the "Sudoku Solver" algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, breaker, translator), or the "Sudoku Solver" functions (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and all data download, script, or API access for "Sudoku Solver" are not public, same for offline use on PC, mobile, tablet, iPhone or Android app! Some variants of the square sudoku, however, use non-square inner blocks (see sudoku 6圆, sudoku 7x7 or sudoku 8x8) Ask a new question Source codeĭCode retains ownership of the "Sudoku Solver" source code. By keeping the sudoku NxN rules that require the N characters to be used on each row and column, then it is impossible to respect them if the sudoku is not square.
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