Sudoku Pluzzle

I'm looking for Algorithms that will solve sudoku puzzles. Im trying to write my own program for this to get ready for a compition. Would anyone know where to find these algorithms or ways to slove sudoku puzzles using a system every time? Any suggestions are helpfull thank you,
Cobbweb

I think you are going to have to write your own algorythm for this.
The math is beyond me, but off the bat I am going to guess that a brute-force-from-zero approach is not going to work anytime this century. However, if you make an initial elimination pass and then start trying possibilities with recursive elimination passes from there I bet it would chop things down enough that you could just do it that way without any really clever algorythm.
A B C
A 1 ? ?
B ? ? 3
C ? 2 ?With coordinates given as X,Y - so that the 3 is at C,B.
The number at A,B could be 1, 2, or 3, given only the rules of the game. Your "initial pass" is where you just run through the colum (A) and the row (B) and eliminate possibilities. So we know it cannot be 1 because there is a 1 at A,A and it cannot be 3 because there is a 3 at C,B. In a puzzle this simple that already tells us the answer (since only 1 is left) but obviously this will not be the case in a real puzzle. However, we will still have chopped out a LOT of possibilities.
Next we just pick an order for empty spaces - say left to right, top to bottom. The first one is B,A, so we go there. Then we just pick a number (moving from 1 up) to try out. That number gives us more information, so we make another pass over the entire grid eliminating stuff again. Then we just walk down the grid in a binary search tree type of dealy.
I bet that even a big puzzle would be no problem for a modern computer this way.
Drake

Similar Messages

Looking for All-In-One Sudoku Game App for iPad?

Bare with me... I'm going to learn now if this is an appropriate question here and if not where to go that would be appropriate?
I'm looking for a great iPad Sudoku game app that offers a variety of different format variations using numbers 1-9, different colors, and different shapes--that sort of thing...instead of just the common numbers. I'm not concerned about scoring the game or tracking time or the leaderboard stuff.
I've looked and found a gillion to consider including Google and looked at some for more detail but so far have found none...and maybe none exist or maybe I'll have to settle for two or three separate Sudoku games to fullfill what I'm after?
So maybe someone in the community knows of just the Sudoku app I'm looking for?
Thank you.

A quick Google search provided the following: http://itunes.apple.com/us/app/sudoku-hd-for-ipad/id364909963?mt=8
I don't know if it offers exactly what you want, but you can check the App Store, or you can go to Google and type the following in your search bar: apple sodoku app ipad
Several options will come up.

Java program for Sudoku puzzle

I basically need to list the possible solutions to every blank space in a sudoku puzzle. I can make my puzzle in a .txt file and then just run that in my program.
Here's an example of a line I would create in my.txt file:
5 3 _ _ 7 _ _ _ _ (So possible solutions for the third spot would be 1,2, or 4. Then you'd continue down the line)
So to get started I need to create a 9x9 array to store my .txt file. Read in my input one line at a time, then use a StringTokenizer to break apart each value in the line. So basically I need help starting that beginning part of my program. I'm a pretty slow learner with this stuff so a little help getting me started helps out a lot, then I tend to catch on to what is going on and I can finish up from there.
Thanks Guys

I still need to loop through and rows, columns, and grid to find possible solutions but I didn't ask for help on that. I know how to set up a 2d array, but when I set it up it's not reading out my .txt file. I was going to use 'char' in my array, but I don't know how I'm going to read from that .txt file, charAt I was thinking. Then for the stringTokenizer I'm really confused on how I would break apart each value from my .txt file.So, it looks like you're panicking and trying to do everything all at once. Maybe that's why you aren't getting anywhere. You need to start small. Don't try to write the whole program in one go, but instead start with a simpler program that doesn't do the whole business. In fact, start with a really simple program that does just one thing.
What's the first thing that's necessary? You have to read your input data from a file, one line at a time. (Yes, then you have to break each of the lines into pieces, but don't get ahead of yourself.) So write a little program that only reads your input file one line at a time. To check that it's working, just write each of the lines out to the console.
Then when that's working, add another feature. That would be splitting the lines into pieces. Again, for now just write the pieces out to the console to check that it's working. Then carry on from there.

Error message when trying to access the free Sudoku game I downloaded from Blackberry Owners' Forum

I downloaded the free Sudoku game from the Blackberry Owners' Lounge (at http://na.blackberry.com/eng/ownerslounge/downloads/games.jsp) to my PC and then used the Blackberry Desktop Manager to transfer it to my Blackberry Curve 8300.
But, when I try to open it from my Curve, I get the following error message: Application terminated: Sudoku has been denied the "Interprocess Communication" permission".
Any idea what I've done wrong and/or how to correct the problem?

Hi and Welcome to the Community!
With the hundreds of possibilities, it's a pity you didn't provide the actual error message that you are seeing. Please provide the complete and exact error message, including all punctuation.
Thanks!
Occam's Razor nearly always applies when troubleshooting technology issues!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.
Join our BBM Channels
BSCF General Channel
PIN: C0001B7B4 Display/Scan Bar Code
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Why does my photosmart 7510 freeze when trying to print from Sudoku app?

I have had my Photosmart 7510 printer for about a week now and am generally very pleased with it. However, whenever I try to print a Sudoku from the Sudoku App the printer screen freezes and the only way to get the printer working again is to switch it off and on. All in all, I have tried this about 20 times over several days and it froze every time apart from ONCE where it worked fine. Any ideas please? I have tried deleting and re-adding the app as well as disabling and re-enabling web services. Othe apps that I have tried seem to work perfectly. Thanks.

Hello,
How are you connected to the printer, USB or wireless?

Threaded Sudoku solver - Assignment question (NOT LOOKING FOR ANSWERS )

Hi All,
I'm going to be upfront and point out this is an assignment that i'm currently working on and i'm not receiving much in the way of feedback from the class forums.
This is currently a 4th year OO assignment for UNSW Australia.
What I am having trouble doing is figuring out where my program is deadlocking or dying. There have been a number of requirements set out by the assignment, basically no synchronization, no locking. We are able to use volatile, atomic, immutable and thread-local objects. The task is to find all solution for a given N x N sudoku problem using X number of threads. I have successfully built the solver (X = 0) without too much trouble and I thought i had managed to modify the recursive algorithm to suit but unfortunately I think I have come unstuck.
Any generalized tips would be appreciated when implementing threads that utilise checking flags to determine when the thread is finished processing.
Kind Regards,
Chris Gibbs

Honestly, I think that recursion (as you stated) would be the easiest way to have solved this problem. But as you stated, threads must be used to solve this problem as a requirement of the project...
You could easily launch a Thread each time instead of calling your recursive method... that could possibly result in a crap load of threads, but the idea would work.
Definitely take a look at the SwingWorker class here if you're able to use J2SE 6: [http://java.sun.com/javase/6/docs/api/javax/swing/SwingWorker.html|http://java.sun.com/javase/6/docs/api/javax/swing/SwingWorker.html]
I currently use it while gathering data from several websites at the same time. What I did was create and execute() X number of MySwingWorker objects to collect the data, while they are not complete (i.e. MySwingWorker.isDone() is false) I just Thread.sleep(...).
Give it a try. It may suit your needs.

Sudoku

I don't know why this is not working. Could someone please help ASAP. THe problem is that the sudoku board is printing some zeros.
public class Sudoku {
private int[][] Board = {
{0,5,0,0,1,0,0,4,0},
{1,0,7,0,4,0,6,0,2},
{0,0,0,9,0,5,0,0,0},
{2,0,8,6,3,0,5,0,1},
{0,4,0,0,7,0,0,2,0},
{9,0,1,0,8,0,4,0,6},
{0,0,0,4,0,1,0,0,0},
{3,0,4,0,5,8,7,0,9},
{0,2,0,0,6,0,0,1,0}
public boolean row_Col(int row, int col, int num)
for(int count=0; count<9; count++)
if(Board[count][col]==num || Board[row][count]==num)
return false;
return true;
public boolean box(int row, int col, int num)
for(int count1=0; count1<3; count1++)
for(int count2=0; count2<3; count2++)
if(Board[count1+row/3*3][count2+col/3*3]==num)
return false;
return true;
public boolean solve()
for(int row=0; row<9; row++)
for(int col=0; col<9; col++)
if(Board[row][col]==0)
//find next possible value
for(int num=1; num<=9; num++)
if(row_Col(row,col,num))
Board[row][col] = num;
if(solve())
return true;
else
//Backtracking
Board[row][col] = 0;
}//end if
return true;
public String print()
String ans="------------------\n";
for(int count=0; count<9; count++)
for(int count1=0; count1<9; count1++)
ans += Board[count][count1] + "|";
ans += "\n------------------\n";
return ans;
//Programm entry
public static void main(String args[])
Sudoku s = new Sudoku();
String strans;
System.out.println("Sudoku is solving...");
if(s.solve())
strans="Solved\n";
strans+=s.print();
else
strans="No solution\n";
strans+=s.print();
System.out.println(strans);
}

go in your printables and adjust day or time

Daily Sudoku Will No Longer Print Out

Daily Sudoku worked great for several days after I first got my HP printer. Now it will no longer work--I've tried to set it up again several times to no avail. Please help!

The last thing I want to do is remove web services. It may fix your problem but it will remove your email address so let's try some other steps first. I was able to print the Easy Sudoku and it seems to be up-to-date.
Press the ePrint button and then go into the "Settings." Scroll down until you see "Turn ePrint Off" and follow the prompts to simply turn it off. You should still be in the ePrint Settings so then "Turn ePrint On." It immediately goes back on when you press that so there should be no prompts.
Press the ePrint button again because the back arrow takes you to the main screen. Now "Print Info" page in order to complete the steps to trick the ePrint to communicate with the app. Print Apps are third-party software and it is somewhat difficult to work with them because it's hard to tell if there is a problem on their end.
Try to print the Daily Suduko again and if that does not work, turn the printer off and back on again with the power button. At this point, if you are still having problems let me know what happens when you try to print it and it doesn't work. For example, do you get an error message or does the printer freeze up, etc.?
Don't forgot to say thanks by giving "Kudos" if I helped solve your problem.
When a solution is found please mark the post that solves your issue.
Every problem has a solution!

How to download sudoku software for 6275 CDMA ?

I wish to download sudoku software for 6275 CDMA.
Please tell me from where ?

Hi surrendernot,
It is possible that either a) you were using different scanning software other than HP software for scanning, or b) the HP software is different on Windows 7, than on Windows XP, as they are completely different Operating Systems, and could be a newer version of the software.
Some other methods of scanning can be found within this How to Scan guide, HP Multifunction Printers - How to Scan: Windows 7, you can try scanning without HP software as well.
Hope this answers your question!
RnRMusicMan
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos Thumbs Up" to say “Thanks” for helping!

Reporting an App error? EA Sudoku update doesn't work

Does anyone know how to report an iPhone App error?
I've been using EA's Sudoku App for weeks now with no issue. This morning I downloaded the latest update and now the game doesn't work. It loads fine but when it brings you to the board it is populated incorrectly with, for example, three number 2s in one square and 4 number 7s in another.
Thanks,
Jacob

You're not the only one -- I'm having the same problem, although it's affecting at least three levels -- Hard, Very Hard and Insane. I sent an e-mail to iTunes support; will post a resolution here if I get one. Please do the same if you can resolve it, so that anyone else having the problem can benefit.

Sudoku Program

Write a Sudoku validator for 4x4 grids made up of 2x2 regions instead of 9x9 grids made up of 3x3 regions. Sudoku puzzles that use 4x4 grids only use the numerical digits 1 through 4 instead of 1 through 9.
Things to Remember:
-Dont use arrays
-Input 16 values into 16 seperate variables
-Try using only if and if/else statements
Outcome should look something like this:
Welcome to the Sudoku Checker v1.0!
This program checks simple, small, 4x4 Sudoku grids for correctness. Each column, row and 2x2 region contains the numbers 1 through 4 only once.
To check your Sudoku, enter your board one row at a time, with each digit separated by a space. Hit ENTER at the end of a row.
Enter Row 1: 1 2 3 4
Enter Row 2: 3 4 2 1
Enter Row 3: 1 2 3 4
Enter Row 4: 4 3 2 1
Thank you. Now checking ...
REG-1:GOOD
REG-2:GOOD
REG-3:GOOD
REG-4:GOOD
ROW-1:GOOD
ROW-2:GOOD
ROW-3:GOOD
ROW-4:GOOD
COL-1:BAD
COL-2:BAD
COL-3:GOOD
COL-4:GOOD
SUDO:INVALID

I built a generic sudoku solver which not only validates, but suggests moves /solves an n x m (dimensions can be different and arbitrary) board by using an int[m][n] array for entered value and a Set<Integer>[m][n] for the possibilities. I added a method called runRules() and created rules off of the following two abstract classes.
package tjacobs.games.sudoku;
Remove possible values on cell row,col using the entered values in the board
public abstract class AbstractCellRule {
public abstract void runCellRule(SudokuBoard sudoku, int[][] board, int row, int col);
package tjacobs.games.sudoku;
import java.awt.Rectangle;
For rules dealing with a range (row, column, box) in general, not focused on 1 particular cell
public abstract class AbstractRangeRule {
public abstract void runRangeRule(SudokuBoard sudoku, int[][] board, Rectangle bounds);
}

Sudoku gui design

Hi Friends ,
I wish to design sudoku internal matrix in gui how to start with any help from u people.
or any link which can teach me how to build a 9 by 9 matrix in graphics and.
Regards,
weakinjava

Can't you just lay out 9 by 9 JLabel fields?Or JTextFields. Then you can actually insert values.

Sudoku Help

Hi
Im new to java and im curently building a sudoku game.
At the minute i have a gui class which builds my gui with 81 text fields and a few jbuttons to load save etc.
im planning on using a 2d array. i want to be able to load a puzzle into a 2d array and then for the puzzle to be displayed in my 81 textfields.
Hope this makes sense??
any help appreciated.
Thanks.

whats the best way then?? i want to keep it as simple
as possible."simple" is not a simple concept ;-)
If by "simple" you mean "the smalles amount of files to handle" then your approach would be the simplest, but that's usually not a usefull definition.
If by simple you mean "easy to understand" then producing seperate classes to handle seperate tasks is usually the better approach.
The problem is that some of those seperations are very simple if you've got your head around them but can be confusing if you're very new. But you should really work at climbing that barrier, as it allows you to handle much larger problems without getting confused.

Sudoku Algorithm

Hi, i was venturing out to design an algorithm to generate sudoku puzzles, I was thinking of emplying 2D Matrix arrays. The idea I have is filling up the whole grid first with a solution then taking away a few numbers. I don't really know how to do this, though I have an idea, getting it to check the rows and columns add up to 45 and each 3x3 grid adds up to 45, 45 being the sum of all the numbers in a 3x3 grid. Would anyone be able to tell me if this would work and how would I be able to program this in JAVA. Many thanks in advance.

And I need an algorithm to solve sudokupuzzles.
That's the hard part, at least if you want to solve
it without brute force.Indeed, I thought that only with brute force Sudoku can be solved.
Indeed, I don�t think that there is a "magic intelligent" algorithm that can solve it . Well, Sudoku is cool exactly because it can just be solved by brute force. LOL!!!!
Maybe some math genius person knows how to write an algorithm to solve Sudoku easily, or how to explain and prove mathematically that an algorithm to solve that is not possible.

Sudoku in J2ME

Hi guys,
I am trying to fix a problem wit a MIDlet I have... jus want to know a way of drawing fixed numbers onto the Sudoku grid using an Array...

Yea I know I could do it like that..... but there is a way of doing it with 2D Arrays and am not sure how to do it that way...
The numbers entered onto the grid is determined by an Array... so in the same way the fixed numbers should be able to be displayed with an Array.... I made an attempt as follows....
public Cell(String s) {
int i, j;
SMatrix = new byte[9][9];
fixedNumber = new boolean[9][9];
for (i = 0; i < 9; i++)
for (j = 0; j < 9; j++)
SMatrix[i][j] = draw.String (""+......, x, y, 16|4);
if (SMatrix[i][j] > 10)
fixedNumber[i][j] = true;
SMatrix[i][j] -= 10;
else
SMatrix[i][j] = 0;
fixedNumber[i][j] = false;
}

Sudoku Pluzzle

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