Addendumįor a more efficient program for solving Sudoku puzzles, with an interesting discussion of the approach, see Peter Norvig's Solving Every Sudoku Puzzle. Here's the whole Sudoku program in a single file: Sudoku solver program. So I think its enough to check for 0 and duplicates on the row: from collections import Counter solved True for row in board: if max (Counter (row).values ()) > 1: solved False elif 0 in row: solved False. On an ATSAMD51-based board such as the Adafruit PyBadge the "world's hardest Sudoku" takes approximately 128 seconds to solve. Because if there are duplicates in the column or in the grid, there will also be duplicates in the row. The program prints out the solution for example here's the solution to a different Sudoku, in case you want to try solving the "world's hardest Sudoku" by hand before running the program. (format t "Sorry, solution not found."))) To run the program call (solve): (defun solve () The guess routine calls check to check that the number is the current cell obeys the Sudoku rules: (defun check (num row col)įinally, print-board uses format statements to print the solution in a readable layout: (defun print-board () ((plusp (aref board row col)) (guess (1+ index))) ![]() Note that the program fills in the array as it solves the Sudoku, so if you want to run it again you need to reinitialise the array. This is one designed by Dr Arto Inkala of Finland, said to be the hardest Sudoku in the world! (defvar board Descriptionįirst you define the problem, using 0 for empty cells. Note that this example won't run on ESP32 boards because they don't have enough stack space. It will run on the Adafruit ARM M4 boards or the RISC-V boards. One of the more complex of these is Andrew Stuart’s solver which implements 38 different strategies for solving Sudokus. It is based on a program by Daniele Mazzocchio. This Sudoku solver demonstrates the new array and format features in uLisp Version 3.2. The Solver will provide you with the right solutions in seconds. If you don't know what number to put in, just enter the numbers you have already filled in the cells of the Sudoku grid. Arbitrary-precision arithmetic extension Our Sudoku Solver tool is a powerful calculator that uses cutting-edge algorithms to solve any Sudoku puzzle quickly and accurately.
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