/**
*
*/
package org.mechaevil.util.Misc;
/**
* @author st0le
*
*/
public class SudokuSolver {
public static boolean solvePuzzle9(int [][]matrix)
{
int x=0,y=0;
boolean found = false;
for(x = 0;x < 9; x ++)
{
for(y = 0;y < 9; y++)
{
if(matrix[x][y] == 0)
{
found = true;
break;
}
}
if( found ) break;
}
if(!found) return true;
boolean digits[] = new boolean[11];
for(int i = 0; i < 9; i++)
{
digits[matrix[x][i]] = true;
digits[matrix[i][y]] = true;
}
int bx = 3 * (x/3), by = 3 * (y/3);
for(int i =0;i<3;i++)
for(int j = 0; j < 3; j++)
digits[matrix[bx+i][by+j]] = true;
for(int i = 1 ; i <= 9; i++)
{
if(!digits[i] )
{
matrix[x][y] = i;
if(solvePuzzle9(matrix))
return true;
matrix[x][y] = 0;
}
}
return false;
}
}
