Before starting you should know this project is now older version. Updated version is here. Sudoku is my first java project. This game has some few options:. Game start from this file because it contains the main method. The source code is :. It shows me errors on line 5, in the GraphicallyRepresentation.

Could you help me out please? Hi chhaya, There is an 2D integer array name cp in GraphicallyRepresentation. This array is populated by calling logic. This array contains the answer of the puzzle. So if an user will enter an input your program should compare the input with the answer array cp. May be you have got your solution. Further, I am comparing both array values, if i found same values on same array index it mean the particular value is repeated.

Then again, I assign random value to this index and check particular column and row for no any repeat occurrence in particular row and in column. By this way I am trying to solve the Sudoku. But, Its not executing, It stops at particular position If i remove for ;; loop in solveGrid method, it gets executed. Please look in my code and help me to solve the Sudoku through my way!

According to your logical description i think your logic has high complexity. You can calculate your complexity of this logic. May be you should change your logic. When i compile GraphicallyRepresentation. Note: Recompile with -Xlint:deprecation for details. I do not have problem with Logic.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

## sudoku-generator

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. How do you generate a Sudoku board with a unique solution? What I thought was to initialize a random board and then remove some numbers.

But my question is how do I maintain the uniqueness of a solution? As long as the list is not empty, take the next position from the list and remove the number from the related cell. Test uniqueness using a fast backtracking solver. My solver is - in theory - able to count all solutions, but for testing uniqueness, it will stop immediately when it finds more than one solution.

If the current board has more than one solution, undo the last removal step 3and continue step 3 with the next position from the list. This gives you not only unique boards, but boards where you cannot remove any more numbers without destroying the uniqueness of the solution. Of course, this is only the second half of the algorithm.

Kaiaua mussel farm fishingThe first half is to find a complete valid board first randomly filled! It works very similar, but "in the other direction":. Add a random number at one of the free cells the cell is chosen randomly, and the number is chosen randomly from the list of numbers valid for this cell according to the SuDoKu rules.

Use the backtracking solver to check if the current board has at least one valid solution. If not, undo step 2 and repeat with another number and cell.

Note that this step might produce full valid boards on its own, but those are in no way random. You can swap any row of three 3x3 blocks with any other row. You can swap any column of three 3x3 blocks with another column. Within each block row or block column you can swap single rows and single columns. Finally you can permute the numbers so there are different numbers in the filled positions as long as the permutation is consistent across the whole board.

In his master's thesis, Takayuki Yato defined The Another Solution Problem ASPwhere the goal is, given a problem and some solution, to find a different solution to that problem or to show that none exists. Yato then defined ASP-completeness, problems for which it is difficult to find another solution, and showed that Sudoku is ASP-complete. The solution is divide in to 2 parts: A.

Generating the number pattern billion B. A For Number pattern the fastest way which can generate unique combinations with NO time spent on backtracing or testing. Step 1. Choose an already exiting matrix, I chose the below one as it can be made easily by human without any help from a computing device or solver:.

Step 2. Shuffle the the digits and replace in all other cells Step 3. Randomly rearrange columns 1,2 and 3 within themselves Step 4. Randomly rearrange columns 4,5 and 6 within themselves Step 5. Randomly rearrange columns 7,8 and 9 within themselves Step 6.

1g dsmRandomly rearrange rows 1,2 and 3 within themselves Step 7. Randomly rearrange rows 4,5 and 6 within themselves Step 8. Randomly rearrange rows 7,8 and 9 within themselves Step 9.Hi, I am going to explain to you how to make a sudoku puzzle generator in java.

The algorithm followed by me is taken from Sudoku Algorithm. Though I will be explaining the code in detail it would be better if you read and understand the algorithm from the above-mentioned site. We select two rows from each of the three groups.

Similarly, we do for columns. Interchange 2 rows and columns : Following functions will interchange two rows and two columns. To strike out the elements level1 check is used. To know more about level1 check go to the link given and read Step 3, 4th point. This is the complete code to create a sudoku puzzle generator.

If you need any clarification on any topic you can ask in the comment box. Great work Arunabh I like the way you describe the steps and the whole concept is very intresting.

### Sudoku game using Java

Like Liked by 1 person. Amazing work there and I love the way you explained code if you are interested we should start a blog together. Like Like. What dos this section of code means? Initial value of counter is 0. We run for loop for two times. Once we interchange two rows and once we interchange two coloumns.

What does this section of code do? Up until this function we are generating sudoku puzzle in which all the numbers are visible. We need to hide few numbers so that players can fill it. This function basically deciding which cells to strike out so that players can fill it. I am trying to recreate this in the NetBeans interface. Any idea of why this is?By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Code Review Stack Exchange is a question and answer site for peer programmer code reviews.

It only takes a minute to sign up. I've made a Sudoku generator.

**How to Create SUDOKU GAME!!!**

It works but it's clearly not very efficient. I'm looking for ways to optimize and speed it up a bit. You can check it out in this fiddle. The results are printed to the JS console with how many iterations it takes to find a working puzzle and the Sudoku array printed to console.

Which can take between 6 to iterations, which I can't help but feel isn't very efficient. I'd also like any tips to help find the dimensions of the sub boxes to make a Sudoku of any size.

I currently have it working with a 9x9 grid with 3x3 sub boxes, and 6x6 grid with 3x2 sub boxes. But is there any formula to figure out how to find sub box dimensions with any grid size?

Using square roots should work to find the sub box dimensions for 4x4, 9x9, 16x16, etc. But what about 6x6?

Eric ferguson familySign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Sudoku puzzle generator with JavaScript Ask Question.

Asked 4 years, 6 months ago. Active 3 years, 8 months ago. Viewed 2k times. Active Oldest Votes. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Socializing with co-workers while social distancing.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

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It features a Generator to generate random Sudoku Grid s of various complexity as well as a Solver to solve any provided Grid using backtracking.

Sudoku is a logic-based, combinatorial number-placement puzzle.

Nordic componentsSource Wikipedia. For detailed information check the javadoc. How to use Generator? In order to generate a new, random Sudoku Grid the Generator class features a straightforward generate method.

This method takes the numberOfEmptyCells as parameter. This parameter controls the complexity of the resulting Grid for human players. The complexity increases with a higher amount of empty cells.

The example Grid shown above contains 42 empty cells. How to use Grid? In order to display the Grid in your application you have to iterate over the Grid utilizing its getSize and getCell functions.

For console-based application you may also use its convenient toString method which produces a textual representation as shown in the example grid above. In order to create a Grid using standard Java data types you can use a two-dimensional array of integers and Grid 's static factory method of.

Motivation The reason I created this library was that I wanted to understand how to solve a Sudoku puzzle programmatically. I was afraid that a sort of "brute force" technique will take too long. Thus, my first solution followed the concept of "candidate search". This lead to many lines of code and only worked for simple - medium level Sudokus.

At a certain point I needed to make assumptions anyway, so I started to use backtracking. Very quickly I've thrown away my solution and started to use backtracking completely, which simplified the algorithm's code a lot. Algorithm Backtracking is brute force.This restricts the program to Windows.

I abstracted the program to a series of functions which can be interfaced to the native GUI toolkits. The GUI interface needs only some buttons, an image box, and mouse position.

The functions are added to the GUI code directly. This can be displayed in Windows and Linux. It can also be directly worked on to produce the various images necessary for the program.

Another approach is to use code that can be directly run on any platform without special preparation. This could be software written in an interpreted language for which run-time packages are needed. I have been learning Java so I decided to rewrite my Sudoku program and make it truly platform independent. Each has is own GUI toolkit. The code can be written and hacked with a text editor using javac to compile and java to run the application.

This is where all the hard work is done to create the GUI. It positions and monitors the push buttons. These machines had the correct Java runtime installed. If someone could spare the time, it would be nice to know if it works on Linux or Mac.In this demo, backtracking algorithm is used for generating the sudoku. Difficulty and solvability is totally random as I randomly left a number of hints from a full-filled board. Skip to content. Instantly share code, notes, and snippets. Code Revisions 3.

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Embed Embed this gist in your website. Share Copy sharable link for this gist. Learn more about clone URLs. Download ZIP. Javascript Sudoku Puzzle Generator. API is designed to be pluggable, but needs more interface to support this. Currently it responds with an array of rows. Please file a bug.

Will be overridden through the backtracking process, and at the and, this will be the real results. Each cell has 9 alternative paths randomly ordered. Javascript Sudoku Puzzle Generator In this demo, backtracking algorithm is used for generating the sudoku. Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment.

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## Moogubei

Posted on 19:38 - 21.12.2020Wohin ja hier gegen die Autorität