Sudoku code

Sudoku is a fun puzzle game where you fill a grid with numbers from 1 to 9 in a way that each row, column, and 3x3 box has all the numbers from 1 to 9 without repeating any of them. But how can we make a computer solve Sudoku?

Well, we can write code that follows some rules to solve the puzzle.

First, the code needs to create a grid with an empty box for each cell. Then, it will fill in some of the boxes with numbers based on the given puzzle.

Next, the code will check the rows, columns, and boxes to see what numbers are already there. Then it will make a list of numbers that are not used in each row, column, and box.

After that, the code will look for a cell that has only one possible number left and fill that in. Then it will repeat this process until no more cells have only one possible number left.

If there are no cells left with only one possible number, the code will have to make some guesses. It will choose a cell and try filling in one of the numbers that were not used in the row, column, and box of that cell. If it leads to a contradiction, meaning a number is repeated in the same row, column, or box, the code will backtrack and try another number until it finds a solution.

Finally, the code will check if the entire grid has all the numbers from 1 to 9 in every row, column, and box without repeating any of them. If not, it will go back and try another guess until it finds a correct solution.