SUDOKU 1

CRilliterate · Dec 9, 2005

I duscovered SUDOKU

Please, try it - wonderfull mind exersize.

http://www.sudoku.com/

Enjoy and give feedback

sleipnir214 · Jan 5, 2006

CRilliterate:
See Thadeus' post in this thread on 12 Dec 05 10:30 and my reply at 12 Dec 05 10:49

Want the best answers? Ask the best questions!

TANSTAAFL!!

CRilliterate · Jan 5, 2006

I was kidding, feeling funny:-D

kaht · Jan 5, 2006

Someone posted this in the javascript forum a while back. I couldn't relocate the thread, but I still had it saved to my pc:

Code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1 Strict//EN" "[URL unfurl="true"]http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">[/URL]
<html xmlns="[URL unfurl="true"]http://www.w3.org/1999/xhtml"[/URL] lang="en" xml:lang="en">
<head>
<meta name="author" content="Jeff Home" />
<meta name="description" content="Test Harness" />
<meta name="copyright" content="Copyright © 2005 - Jeff Home" />
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
<meta http-equiv="content-language" content="en" />
<title>Su Doku - Test Harness</title>

<style type="text/css">
/* general styles for the page */
body {
   padding:10px;
   margin:10px;
   font-family:Verdana,Arial,sans-serif;
}
.randomise {
   width:100px;
   height:40px;
   border:0px;
}
table {
   border-collapse:collapse;
   border:3px #000000 solid;
}
td {
   width:30px;
   height:30px;
   border:1px #999999 solid;
   padding:5px;
   vertical-align:middle;
   text-align:center;
}
.fixed { font-style:bold; }
.bordertop { border-top:2px #666666 solid; }
.borderbottom { border-bottom:2px #666666 solid; }
.borderleft { border-left:2px #666666 solid; }
.borderright { border-right:2px #666666 solid; }
#clipboardTextarea {
   padding:10px;
   font-family:"Courier New",courier,sans-serif;
   font-size:12px;
   position:absolute;
   top:100px;
   left:500px;
   width:230px;
   height:230px;
}
</style>

<script type="text/javascript">
<!--
// preset game - 6 iterations
function game1()
{
   init();
   gameArray[1][2] = [6];
   gameArray[2][0] = [4];
   gameArray[2][1] = [7];
   gameArray[3][0] = [8];
   gameArray[4][1] = [6];
   gameArray[5][0] = [5];
   gameArray[6][0] = [6];
   gameArray[6][1] = [1];
   gameArray[7][2] = [2];
   gameArray[1][3] = [1];
   gameArray[1][4] = [2];
   gameArray[1][5] = [5];
   gameArray[2][4] = [6];
   gameArray[3][3] = [9];
   gameArray[3][5] = [2];
   gameArray[4][3] = [7];
   gameArray[4][5] = [4];
   gameArray[5][3] = [3];
   gameArray[5][5] = [6];
   gameArray[6][4] = [7];
   gameArray[7][3] = [6];
   gameArray[7][4] = [9];
   gameArray[7][5] = [8];
   gameArray[1][6] = [7];
   gameArray[2][7] = [5];
   gameArray[2][8] = [2];
   gameArray[3][8] = [7];
   gameArray[4][7] = [1];
   gameArray[5][8] = [8];
   gameArray[6][7] = [9];
   gameArray[6][8] = [5];
   gameArray[7][6] = [3];
   drawCanvas(true);
   outputClipboard(true);
}

// preset game - 14 iterations
function game2()
{
   init();
   gameArray[0][0] = [7];
   gameArray[0][2] = [9];
   gameArray[1][0] = [2];
   gameArray[1][1] = [5];
   gameArray[0][5] = [2];
   gameArray[1][5] = [3];
   gameArray[2][5] = [1];
   gameArray[2][8] = [4];
   gameArray[3][0] = [9];
   gameArray[4][2] = [6];
   gameArray[5][1] = [3];
   gameArray[5][2] = [8];
   gameArray[3][3] = [7];
   gameArray[5][5] = [5];
   gameArray[3][6] = [6];
   gameArray[3][7] = [1];
   gameArray[4][6] = [8];
   gameArray[5][8] = [9];
   gameArray[6][0] = [6];
   gameArray[6][3] = [5];
   gameArray[7][3] = [8];
   gameArray[8][3] = [1];
   gameArray[7][7] = [4];
   gameArray[7][8] = [7];
   gameArray[8][6] = [9];
   gameArray[8][8] = [8];
   drawCanvas(true);
   outputClipboard(true);
}

// preset game - 27 iterations
function game3()
{
   init();
   gameArray[0][0] = [3];
   gameArray[0][2] = [1];
   gameArray[1][0] = [2];
   gameArray[0][3] = [2];
   gameArray[1][4] = [4];
   gameArray[1][5] = [6];
   gameArray[0][6] = [5];
   gameArray[1][7] = [1];
   gameArray[2][6] = [9];
   gameArray[3][0] = [1];
   gameArray[3][1] = [7];
   gameArray[4][1] = [3];
   gameArray[3][5] = [5];
   gameArray[5][3] = [9];
   gameArray[4][7] = [7];
   gameArray[5][7] = [5];
   gameArray[5][8] = [1];
   gameArray[6][2] = [2];
   gameArray[7][1] = [9];
   gameArray[8][2] = [6];
   gameArray[7][3] = [8];
   gameArray[7][4] = [1];
   gameArray[8][5] = [9];
   gameArray[7][8] = [4];
   gameArray[8][6] = [1];
   gameArray[8][8] = [8];
   drawCanvas(true);
   outputClipboard(true);
}

var gameArray = [];
var rows = cols = 9;
var iterations = 0;
var threshold = 0;
var stalled = false;

// initialise the variables and insert the clues into the gameArray
function init()
{
   iterations = 0;
   stalled = false;
   for (var loop1 = 0; loop1 < rows; loop1++)
   {
      gameArray[loop1] = [];
      for (var loop2 = 0; loop2 < cols; loop2++)
      {
         gameArray[loop1][loop2] = [];
         for (var loop3 = 0; loop3 < 9; loop3++)
         {
            gameArray[loop1][loop2][loop3] = loop3+1;
         }
      }
   }
   drawCanvas(true);
}

// allow the user to click on a cell with 2 possible values - and choose a value to continue testing with
function clickCell()
{
   var _row = parseInt((this.id).substring(1,2),10);
   var _col = parseInt((this.id).substring(3,4),10);
   var newData = prompt('Choose one of the two values below and continue testing',gameArray[_row][_col]);
   if (newData == null) return;
   if (newData == '' || isNaN(newData) || newData.length > 1 || parseInt(newData,10) == 0)
   {
      alert('Please type either the number '+gameArray[_row][_col][0]+' or the number ' +gameArray[_row][_col][1]);
   } else {
      if (parseInt(newData,10) == gameArray[_row][_col][0] || parseInt(newData,10) == gameArray[_row][_col][1])
      {
         gameArray[_row][_col] = [parseInt(newData,10)];
         check(threshold);
      } else {
         alert('Please type either the number '+gameArray[_row][_col][0]+' or the number ' +gameArray[_row][_col][1]);
      }
   }
}

// allow the user to click on a cell and edit it's contents at the initial data entry phase
function dataEntry()
{
   var _row = parseInt((this.id).substring(1,2),10);
   var _col = parseInt((this.id).substring(3,4),10);
   var newData = prompt('Enter a number for this cell','1-9 only');
   if (newData == null) return;
   if (newData == '' || isNaN(newData) || newData.length > 1 || parseInt(newData,10) == 0)
   {
      if (newData == '' || parseInt(newData,10) == 0) gameArray[_row][_col] = [1,2,3,4,5,6,7,8,9];
   } else {
      gameArray[_row][_col] = [parseInt(newData,10)];
   }
   drawCanvas(true);
}

// write the contents of the gameArray to the page
function drawCanvas(_dataload)
{
   for (var loop1 = 0; loop1 < rows; loop1++)
   {
      for (var loop2 = 0; loop2 < cols; loop2++)
      {
         if (typeof(_dataload) != 'undefined')
         {
            document.getElementById('r'+loop1+'c'+loop2).onclick = dataEntry;
         } else {
            document.getElementById('r'+loop1+'c'+loop2).onclick = null;
         }
         document.getElementById('r'+loop1+'c'+loop2).onclick = dataEntry;
         document.getElementById('r'+loop1+'c'+loop2).title = gameArray[loop1][loop2];
         document.getElementById('r'+loop1+'c'+loop2).innerHTML = '?';
         document.getElementById('r'+loop1+'c'+loop2).style.fontWeight = 'normal';
         if (gameArray[loop1][loop2].length == 2)
         {
            document.getElementById('r'+loop1+'c'+loop2).onclick = clickCell;
            document.getElementById('r'+loop1+'c'+loop2).style.backgroundColor = '#aaddee';
            document.getElementById('r'+loop1+'c'+loop2).innerHTML = gameArray[loop1][loop2];
         } else {
            if (gameArray[loop1][loop2].length == 1)
            {
               document.getElementById('r'+loop1+'c'+loop2).style.fontWeight = 'bold';
               document.getElementById('r'+loop1+'c'+loop2).style.backgroundColor = '#eeeeee';
               document.getElementById('r'+loop1+'c'+loop2).innerHTML = gameArray[loop1][loop2];
            } else {
               document.getElementById('r'+loop1+'c'+loop2).style.backgroundColor = '#ffffff';
            }
         }
      }
   }
}

// output the solved game to a text format for emailing
function outputClipboard(_export)
{
   var myExport = _export;

   var myClipboard = ' Total iterations: ' + iterations + '<br /><br />';
   if (myExport==true) myClipboard = ' Current game board...<br /><br />';

   for (var loop = 0; loop < rows; loop++)
   {
      for (var loop2 = 0; loop2 < cols; loop2++)
      {
         myClipboard += ' ';
         if (myExport == true)
         {
            if  (gameArray[loop][loop2].length == 1)
               myClipboard += gameArray[loop][loop2];
            else
               myClipboard += '.';
         } else {
            myClipboard += gameArray[loop][loop2];
         }
         if (loop2%3==2 && loop2!=8) myClipboard += ' |';
      }
      myClipboard += '<br />';
      if (loop%3==2 && loop!=8) myClipboard += ' ------+-------+------ <br />';
   }
   document.getElementById('clipboardTextarea').value = myClipboard.replace(/<br \/>/g,'\n') + '\n';
}

// begin the process of solving the problem
function check(_threshold)
{
   if (typeof(_threshold) != undefined) threshold = _threshold;
   iterations++;
   var startArray = gameArray.concat();
   // check rows
   for (var loop = 0; loop < rows; loop++)
   {
      gameArray[loop] = checkRow(loop);
   }
   // check columns
   for (var loop = 0; loop < cols; loop++)
   {
      var myCol = checkCol(loop);
      for (var loop2 = 0; loop2 < rows; loop2++)
      {
         gameArray[loop2][loop] = myCol[loop2];
      }
   }
   // check blocks
   for (var loop = 0; loop < cols; loop++)
   {
      var myBlock = checkBlock(loop);
      
      gameArray[Math.floor(loop/3)*3][(loop%3)*3] = myBlock[0];
      gameArray[Math.floor(loop/3)*3][(loop%3)*3+1] = myBlock[1];
      gameArray[Math.floor(loop/3)*3][(loop%3)*3+2] = myBlock[2];

      gameArray[Math.floor(loop/3)*3+1][(loop%3)*3] = myBlock[3];
      gameArray[Math.floor(loop/3)*3+1][(loop%3)*3+1] = myBlock[4];
      gameArray[Math.floor(loop/3)*3+1][(loop%3)*3+2] = myBlock[5];

      gameArray[Math.floor(loop/3)*3+2][(loop%3)*3] = myBlock[6];
      gameArray[Math.floor(loop/3)*3+2][(loop%3)*3+1] = myBlock[7];
      gameArray[Math.floor(loop/3)*3+2][(loop%3)*3+2] = myBlock[8];
   }

   if (startArray.toString() == gameArray.toString() && gameArray.toString().length == rows*cols*2-1 && gameArray.toString().indexOf(',,') < 0)
   {
      // puzzle solved
      drawCanvas();
      outputClipboard(false);
   } else {
      if (startArray.toString() == gameArray.toString())
      {
         drawCanvas();
         if (stalled) {
            alert('We have stalled after '+iterations+' iterations!');
         } else {
            stalled = true;
            checkRowAndColumnNumbers();
            check(threshold);
         }
      } else {
         stalled = false;
         if (iterations < threshold)
         {
            check(threshold);
         } else {
            drawCanvas();
         }
      }
   }
}

// return the intersection of values in _arr2 and _arr1
function reduceArray(_arr1,_arr2)
{
   var _tempArr = [];
   for (var loop = 0; loop < _arr2.length; loop++)
   {
      if (_arr1.toString().indexOf(_arr2[loop]) > -1) _tempArr[_tempArr.length] = _arr2[loop];
   }
   return _tempArr;
}

// scan a row and return an array of possible values
function checkRow(_rowNum)
{
   var myRow = gameArray[_rowNum];
   var mySoln = [];
   var myPoss = [];
   for (var loop = 0; loop < cols; loop++)
   {
      if (myRow[loop].length == 1)
      {
         mySoln[mySoln.length] = [myRow[loop][0]];
      } else {
         mySoln[mySoln.length] = 0;
      }
   }
   for (var loop = 1; loop <= 9; loop++)
   {
      if (mySoln.toString().indexOf(loop) < 0)
      {
         myPoss[myPoss.length] = loop;
      }
   }
   var tempArray = mySoln.concat();
   for (var loop = 0; loop < cols; loop++)
   {
      if (mySoln[loop] == 0)
      {
         tempArray[loop] = reduceArray(myPoss,myRow[loop]);
         if (tempArray[loop].length == 1) mySoln[loop] = tempArray[loop];
      }
   }
   return tempArray;
}

// scan each row and column and try to find a unique number that can be placed
function checkRowAndColumnNumbers()
{
   // check the rows
   for (var _rowNum = 0; _rowNum < rows; _rowNum++)
   {
      var myRow = gameArray[_rowNum];
      var mySoln = [];
      for (var loop = 0; loop < cols; loop++)
      {
         if (myRow[loop].length == 1)
         {
            mySoln[mySoln.length] = [myRow[loop][0]];
         }
      }
      for (var loop = 1; loop <= 9; loop++)
      {
         if (mySoln.toString().indexOf(loop) < 0 && myRow.toString().indexOf(loop) == myRow.toString().lastIndexOf(loop) && myRow.toString().indexOf(loop) > -1)
         {
            for (var loop2 = 0; loop2 < cols; loop2++)
            {
               if (myRow[loop2].toString().indexOf(loop) >= 0) gameArray[_rowNum][loop2] = [loop];
            }
         }
      }
   }
   // check the columns
   for (var _colNum = 0; _colNum < cols; _colNum++)
   {
      var myCol = [];
      for (var loop = 0; loop < rows; loop++) myCol[myCol.length] = gameArray[loop][_colNum];
      var mySoln = [];
      for (var loop = 0; loop < rows; loop++)
      {
         if (myCol[loop].length == 1)
         {
            mySoln[mySoln.length] = [myCol[loop][0]];
         }
      }
      for (var loop = 1; loop <= 9; loop++)
      {
         if (mySoln.toString().indexOf(loop) < 0 && myCol.toString().indexOf(loop) == myCol.toString().lastIndexOf(loop) && myCol.toString().indexOf(loop) > -1)
         {
            for (var loop2 = 0; loop2 < rows; loop2++)
            {
               if (myCol[loop2].toString().indexOf(loop) >= 0) gameArray[loop2][_colNum] = [loop];
            }
         }
      }
   }
// drawCanvas();
}

// scan a column and return an array of possible values
function checkCol(_colNum)
{
   var myCol = [];
   for (var loop = 0; loop < rows; loop++) myCol[myCol.length] = gameArray[loop][_colNum];
   var mySoln = [];
   var myPoss = [];
   for (var loop = 0; loop < rows; loop++)
   {
      if (myCol[loop].length == 1)
      {
         mySoln[mySoln.length] = [myCol[loop][0]];
      } else {
         mySoln[mySoln.length] = 0;
      }
   }
   for (var loop = 1; loop <= 9; loop++)
   {
      if (mySoln.toString().indexOf(loop) < 0)
      {
         myPoss[myPoss.length] = loop;
      }
   }
   var tempArray = mySoln.concat();
   for (var loop = 0; loop < cols; loop++)
   {
      if (mySoln[loop] == 0)
      {
         tempArray[loop] = reduceArray(myPoss,myCol[loop]);
         if (tempArray[loop].length == 1) mySoln[loop] = tempArray[loop];
      }
   }
   return tempArray;
}

// scan a block of 9 and return an array of possible values
function checkBlock(_blockNum)
{
   _col = _blockNum%3;
   _row = Math.floor(_blockNum/3);

   var myBlock = [];
   myBlock[0] = gameArray[_row*3][_col*3];
   myBlock[1] = gameArray[_row*3][_col*3+1];
   myBlock[2] = gameArray[_row*3][_col*3+2];
   myBlock[3] = gameArray[_row*3+1][_col*3];
   myBlock[4] = gameArray[_row*3+1][_col*3+1];
   myBlock[5] = gameArray[_row*3+1][_col*3+2];
   myBlock[6] = gameArray[_row*3+2][_col*3];
   myBlock[7] = gameArray[_row*3+2][_col*3+1];
   myBlock[8] = gameArray[_row*3+2][_col*3+2];

   var mySoln = [];
   var myPoss = [];
   for (var loop = 0; loop < myBlock.length; loop++)
   {
      if (myBlock[loop].length == 1)
      {
         mySoln[mySoln.length] = [myBlock[loop][0]];
      } else {
         mySoln[mySoln.length] = 0;
      }
   }
   for (var loop = 1; loop <= 9; loop++)
   {
      if (mySoln.toString().indexOf(loop) < 0)
      {
         myPoss[myPoss.length] = loop;
      }
   }
   var tempArray = mySoln.concat();
   for (var loop = 0; loop < cols; loop++)
   {
      if (mySoln[loop] == 0)
      {
         tempArray[loop] = reduceArray(myPoss,myBlock[loop]);
         if (tempArray[loop].length == 1) mySoln[loop] = tempArray[loop];
      }
   }
   return tempArray;
}
//-->
</script>

</head>

<body onload="init()">
<a href="javascript:check(100)">Find the solution</a> || <a href="javascript:check(1)">Step forward</a> || <a href="javascript:init()">Clear Board</a> || <a href="javascript:outputClipboard(true)">Export Board</a><br /><br />
<a href="javascript:game1()">Load Easy Game</a> || <a href="javascript:game2()">Load Difficult Game</a> || <a href="javascript:game3()">Load Fiendish Game</a><br /><br />

<table>
<tr><td id="r0c0" class="bordertop borderleft"></td>
   <td id="r0c1" class="bordertop"></td>
   <td id="r0c2" class="bordertop"></td>
   <td id="r0c3" class="bordertop borderleft"></td>
   <td id="r0c4" class="bordertop"></td>
   <td id="r0c5" class="bordertop"></td>
   <td id="r0c6" class="bordertop borderleft"></td>
   <td id="r0c7" class="bordertop"></td>
   <td id="r0c8" class="bordertop borderright"></td>

</tr>
<tr><td id="r1c0" class="borderleft"></td>
   <td id="r1c1"></td>
   <td id="r1c2"></td>
   <td id="r1c3" class="borderleft"></td>
   <td id="r1c4"></td>
   <td id="r1c5"></td>
   <td id="r1c6" class="borderleft"></td>
   <td id="r1c7"></td>
   <td id="r1c8" class="borderright"></td>

</tr>
<tr><td id="r2c0" class="borderleft borderbottom"></td>
   <td id="r2c1" class="borderbottom"></td>
   <td id="r2c2" class="borderbottom"></td>
   <td id="r2c3" class="borderbottom borderleft"></td>
   <td id="r2c4" class="borderbottom"></td>
   <td id="r2c5" class="borderbottom"></td>
   <td id="r2c6" class="borderbottom borderleft"></td>
   <td id="r2c7" class="borderbottom"></td>
   <td id="r2c8" class="borderright borderbottom"></td>

</tr>
<tr><td id="r3c0" class="borderleft"></td>
   <td id="r3c1"></td>
   <td id="r3c2"></td>
   <td id="r3c3" class="borderleft"></td>
   <td id="r3c4"></td>
   <td id="r3c5"></td>
   <td id="r3c6" class="borderleft"></td>
   <td id="r3c7"></td>
   <td id="r3c8" class="borderright"></td>

</tr>
<tr><td id="r4c0" class="borderleft"></td>
   <td id="r4c1"></td>
   <td id="r4c2"></td>
   <td id="r4c3" class="borderleft"></td>
   <td id="r4c4"></td>
   <td id="r4c5"></td>
   <td id="r4c6" class="borderleft"></td>
   <td id="r4c7"></td>
   <td id="r4c8" class="borderright"></td>

</tr>
<tr><td id="r5c0" class="borderleft borderbottom"></td>
   <td id="r5c1" class="borderbottom"></td>
   <td id="r5c2" class="borderbottom"></td>
   <td id="r5c3" class="borderbottom borderleft"></td>
   <td id="r5c4" class="borderbottom"></td>
   <td id="r5c5" class="borderbottom"></td>
   <td id="r5c6" class="borderbottom borderleft"></td>
   <td id="r5c7" class="borderbottom"></td>
   <td id="r5c8" class="borderright borderbottom"></td>

</tr>
<tr><td id="r6c0" class="borderleft"></td>
   <td id="r6c1"></td>
   <td id="r6c2"></td>
   <td id="r6c3" class="borderleft"></td>
   <td id="r6c4"></td>
   <td id="r6c5"></td>
   <td id="r6c6" class="borderleft"></td>
   <td id="r6c7"></td>
   <td id="r6c8" class="borderright"></td>

</tr>
<tr><td id="r7c0" class="borderleft"></td>
   <td id="r7c1"></td>
   <td id="r7c2"></td>
   <td id="r7c3" class="borderleft"></td>
   <td id="r7c4"></td>
   <td id="r7c5"></td>
   <td id="r7c6" class="borderleft"></td>
   <td id="r7c7"></td>
   <td id="r7c8" class="borderright"></td>

</tr>
<tr><td id="r8c0" class="borderleft borderbottom"></td>
   <td id="r8c1" class="borderbottom"></td>
   <td id="r8c2" class="borderbottom"></td>
   <td id="r8c3" class="borderbottom borderleft"></td>
   <td id="r8c4" class="borderbottom"></td>
   <td id="r8c5" class="borderbottom"></td>
   <td id="r8c6" class="borderbottom borderleft"></td>
   <td id="r8c7" class="borderbottom"></td>
   <td id="r8c8" class="borderright borderbottom"></td>

</tr>
</table>
<div id="clipboardDiv"></div>
<textarea id="clipboardTextarea"></textarea>
</body>
</html>

copy/paste it into a new .html file

-kaht

How much you wanna make a bet I can throw a football over them mountains?

CajunCenturion · Jan 5, 2006

That code is copyrighted -- Copyright © 2005 - Jeff Home. Do we have permission to post it here?

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sleipnir214 · Jan 5, 2006

This page:

http://www.codecouch.com/jeff/

includes that a variant of that script. Aside from a change to the page title and some indentation differences, they appear to be identical.

The main site contains the text:

Please feel free to try out any of the snippets below - that is why they are here. If you find any of the code useful, you are more than welcome to use it, but please acknowledge its origin.

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TANSTAAFL!!

AnotherHiggins · Jan 5, 2006

Besides, that code would kind of take all the fun out of Sudoku, wouldn't it?

I'm still not sure how this thread relates to this forum.

But while I'm typing, I'll point out that according to Will Shortz, New York Times crossword puzzle editor and NPR's 'Puzzlemaster', Sudoku was actually invented by Howard Garns, an American architect from Indianapolis who died in 1989.

I first read this in the introduction to the first Sudoku book I got (which was by Will Shortz). But I just found this link that provides pretty much the same information.

[tt]_____
[blue]-John[/blue][/tt]

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sleipnir214 · Jan 5, 2006

anotherhiggins:
That was an interesting link. Thank you!

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TANSTAAFL!!

MarcLodge · Jan 10, 2006

For a full history of Sudoku, look here

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