Answer : make a SudokuPuzzel.java class and paste the given below code and run the program.Program has a Recursive method and perform the operation according to your question.
class SudokuPuzzle
{
static int[][] board = new int[][]
{
{3, 0, 6, 5, 0, 8, 4, 0, 0},
{5, 2, 0, 0, 0, 0, 0, 0, 0},
{0, 8, 7, 0, 0, 0, 0, 3, 1},
{0, 0, 3, 0, 1, 0, 0, 8, 0},
{9, 0, 0, 8, 6, 3, 0, 0, 5},
{0, 5, 0, 0, 9, 0, 6, 0, 0},
{1, 3, 0, 0, 0, 0, 2, 5, 0},
{0, 0, 0, 0, 0, 0, 0, 7, 4},
{0, 0, 5, 2, 0, 6, 3, 0, 0}
};
static int N =
board.length;
public static
boolean isSafeDriveSolution(int[][] board,
int row, int col,
int num)
{
// row has the unique (row-clash)
for (int d = 0; d < board.length; d++)
{
// if the number we are
trying to
// place is already present
in
// that row, return
false;
if (board[row][d] ==
num)
{
return
false;
}
}
// column has the unique numbers
(column-clash)
for (int r = 0; r < board.length; r++)
{
// if the number we are
trying to
// place is already present
in
// that column, return
false;
if (board[r][col] ==
num)
{
return
false;
}
}
// corresponding square has
// unique number (box-clash)
int sqrt = (int) Math.sqrt(board.length);
int boxRowStart = row - row % sqrt;
int boxColStart = col - col % sqrt;
for (int r = boxRowStart;
r <
boxRowStart + sqrt; r++)
{
for (int d =
boxColStart;
d < boxColStart + sqrt; d++)
{
if
(board[r][d] == num)
{
return false;
}
}
}
// if there is no clash, it's safe
return true;
}
public static
boolean driveSudokuPuzzle(int[][] board, int n)
{
int row = -1;
int col = -1;
boolean isEmpty = true;
for (int i = 0; i < n; i++)
{
for (int j = 0; j < n;
j++)
{
if
(board[i][j] == 0)
{
row = i;
col = j;
// we still have some remaining
// missing values in Sudoku
isEmpty = false;
break;
}
}
if (!isEmpty)
{
break;
}
}
// no empty space left
if (isEmpty)
{
return true;
}
// else for each-row backtrack
for (int num = 1; num <= n; num++)
{
if
(isSafeDriveSolution(board, row, col, num))
{
board[row][col] = num;
//Recursive Calling........
if
(driveSudokuPuzzle(board, n))
{
return true;
}
else
{
board[row][col] = 0; // replace it
}
}
}
return false;
}
public static
void printSudokuPuzzle(int[][] board, int N)
{
// we got the answer, just print it
for (int r = 0; r < N; r++)
{
for (int d = 0; d < N;
d++)
{
System.out.print(board[r][d]);
System.out.print(" ");
}
System.out.print("\n");
if ((r + 1) % (int)
Math.sqrt(N) == 0)
{
System.out.print("");
}
}
}
// Driver
Code
public static
void main(String args[])
{
int [][] answer=constructSolution();
printSudokuPuzzle(answer,answer.length); //
print solution
}
private static
int[][] constructSolution() {
if (driveSudokuPuzzle(board, N))
{
return board;
}
else
{
System.out.println("No
solution");
return null;
}
}
}
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