wangzuo · January 8, 2012 09:03
diff --git a/README.md b/README.md
diff --git a/annotated.js b/annotated.js
 // /!\ WARNING this function assumes that there is no variable 'A' in the global scope
 function R
 (
    a,  // the array representing the sudoko grid

        // placeholder arguments
    i,  // index of the last empty cell
    j,  // index to check the candidates for the cell 'i'
    m,  // candidate number for the the cell 'i'
    g   // flag whether 'm' is a already used in the same row|col|node as 'i'
 ){
    // phase 1: look for an empty cell
    for
    (   
       i=80;   
       a[i];        // keep going if the cell isn't empty
       i--||A       // decrease the index and throw a ReferenceError exception if we went through the whole grid
    );
    // phase 2: check all candidate numbers for the cell 'i'
    for
    (
      m=10;
      g=a[i]=--m;   // put the candidate in the cell 'i' already and set 'g' to something truthy
                    // at the end of phase 2, the cell 'i' is reset to 0 for "higher" branches of the recursion
        g&&R(a)     // recurse if 'm' isn't already used in the same row|col|node as 'i'
   )
      // phase 3: check if the candidate number is used already
      for(j in a)           // loop through the whole grid again
           g*=              // 
               j==i         // keep 'g' as is if we are on the cell 'i'
               ||           // otherwise, turn 'g' falsy if
               a[j]^m       // the cell 'j' is set to 'm'
               ||           // and 'i' and 'j' are in the same row|col|node
               i%9^j%9&&i/9^j/9&&i/27^j/27|i%9/3^j%9/3
 }
diff --git a/index.js b/index.js
 function R(a,i,j,m,g){for(i=80;a[i];i--||A);for(m=10;g=a[i]=--m;g&&R(a))for(j in a)g*=j==i||a[j]^m||i%9^j%9&&i/9^j/9&&i/27^j/27|i%9/3^j%9/3}
diff --git a/LICENSE.txt b/LICENSE.txt
            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
                    Version 2, December 2004

 Copyright (C) 2011 Mathieu 'p01' Henri - http://www.p01.org/releases/

 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

  0. You just DO WHAT THE FUCK YOU WANT TO.
diff --git a/package.json b/package.json
 {
  "name": "sudokuSolver",

  "description": "Brute force sudoku solver.",

  "keywords": [
    "sudoku",
    "solver",
    "recursive",
    "brute force"
  ]
 }
diff --git a/test.html b/test.html
 <!doctype html>
 <title>Sudoku Solver in 140bytes</title>

 <div>Expected value: <b>4,2,8,1,5,9,6,7,3,1,9,6,3,7,4,8,2,5,3,7,5,8,6,2,9,4,1,9,8,1,4,2,3,5,6,7,5,6,4,7,1,8,3,9,2,7,3,2,5,9,6,1,8,4,2,4,3,6,8,1,7,5,9,6,1,7,9,4,5,2,3,8,8,5,9,2,3,7,4,1,6</b></div>
 <div>Actual value: <b id="ret"></b></div>

 <script>

 var testGrid = [0,0,0,1,5,0,0,7,0,1,0,6,0,0,0,8,2,0,3,0,0,8,6,0,0,4,0,9,0,0,4,0,0,5,6,7,0,0,4,7,0,8,3,0,0,7,3,2,0,0,6,0,0,4,0,4,0,0,8,1,0,0,9,0,1,7,0,0,0,2,0,8,0,5,0,0,3,7,0,0,0];

 var myFunction = function R(a,i,j,m,g){for(i=80;a[i];i--||A);for(m=10;g=a[i]=--m;g&&R(a))for(j in a)g*=j==i||a[j]^m||i%9^j%9&&i/9^j/9&&i/27^j/27|i%9/3^j%9/3};

 var solutionFound = false;
 try
 {
    myFunction( testGrid );
 }
 catch(e)
 {
    solutionFound = true;
 }
 document.getElementById('ret').innerHTML = testGrid;

 </script>
	// /!\ WARNING this function assumes that there is no variable 'A' in the global scope
	function R
	(
	a, // the array representing the sudoko grid

	// placeholder arguments
	i, // index of the last empty cell
	j, // index to check the candidates for the cell 'i'
	m, // candidate number for the the cell 'i'
	g // flag whether 'm' is a already used in the same row\|col\|node as 'i'
	){
	// phase 1: look for an empty cell
	for
	(
	i=80;
	a[i]; // keep going if the cell isn't empty
	i--\|\|A // decrease the index and throw a ReferenceError exception if we went through the whole grid
	);
	// phase 2: check all candidate numbers for the cell 'i'
	for
	(
	m=10;
	g=a[i]=--m; // put the candidate in the cell 'i' already and set 'g' to something truthy
	// at the end of phase 2, the cell 'i' is reset to 0 for "higher" branches of the recursion
	g&&R(a) // recurse if 'm' isn't already used in the same row\|col\|node as 'i'
	)
	// phase 3: check if the candidate number is used already
	for(j in a) // loop through the whole grid again
	g*= //
	j==i // keep 'g' as is if we are on the cell 'i'
	\|\| // otherwise, turn 'g' falsy if
	a[j]^m // the cell 'j' is set to 'm'
	\|\| // and 'i' and 'j' are in the same row\|col\|node
	i%9^j%9&&i/9^j/9&&i/27^j/27\|i%9/3^j%9/3
	}
	DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
	Version 2, December 2004

	Copyright (C) 2011 Mathieu 'p01' Henri - http://www.p01.org/releases/

	Everyone is permitted to copy and distribute verbatim or modified
	copies of this license document, and changing it is allowed as long
	as the name is changed.

	DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
	TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

	0. You just DO WHAT THE FUCK YOU WANT TO.
	{
	"name": "sudokuSolver",

	"description": "Brute force sudoku solver.",

	"keywords": [
	"sudoku",
	"solver",
	"recursive",
	"brute force"
	]
	}
	<!doctype html>
	<title>Sudoku Solver in 140bytes</title>

	<div>Expected value: <b>4,2,8,1,5,9,6,7,3,1,9,6,3,7,4,8,2,5,3,7,5,8,6,2,9,4,1,9,8,1,4,2,3,5,6,7,5,6,4,7,1,8,3,9,2,7,3,2,5,9,6,1,8,4,2,4,3,6,8,1,7,5,9,6,1,7,9,4,5,2,3,8,8,5,9,2,3,7,4,1,6</b></div>
	<div>Actual value: <b id="ret"></b></div>

	<script>

	var testGrid = [0,0,0,1,5,0,0,7,0,1,0,6,0,0,0,8,2,0,3,0,0,8,6,0,0,4,0,9,0,0,4,0,0,5,6,7,0,0,4,7,0,8,3,0,0,7,3,2,0,0,6,0,0,4,0,4,0,0,8,1,0,0,9,0,1,7,0,0,0,2,0,8,0,5,0,0,3,7,0,0,0];

	var myFunction = function R(a,i,j,m,g){for(i=80;a[i];i--\|\|A);for(m=10;g=a[i]=--m;g&&R(a))for(j in a)g*=j==i\|\|a[j]^m\|\|i%9^j%9&&i/9^j/9&&i/27^j/27\|i%9/3^j%9/3};

	var solutionFound = false;
	try
	{
	myFunction( testGrid );
	}
	catch(e)
	{
	solutionFound = true;
	}
	document.getElementById('ret').innerHTML = testGrid;

	</script>