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java sudoku why it doesnt show me the final result of sudoku


java sudoku why it doesnt show me the final result of sudoku

By : Suneel Thakur
Date : November 22 2020, 02:59 PM
With these it helps Your show() method is overriding the java.awt.Window.show() method. You need to call super.show() as the first line in that method. So your new method would be:
code :
public void show()
{
    super.show();//Call to super class to let it paint the window
    for(int i =0;i<9;i++)
    {
        for(int j =0;j<9;j++)
        {
            System.out.print(sudoku[i][j]+" ");
        }
        System.out.println("");
    }
}
package sudoku;

import java.awt.Dimension;
import java.awt.Toolkit;

import javax.swing.JFrame;

public class Main 
{

public static void main(String[] args) 
{
    Sudoku s = new Sudoku();
    s.setSize(400, 400);

    //Center the JFrame
    Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
    s.setLocation(dim.width/2-s.getSize().width/2, dim.height/2-s.getSize().height/2);

    //Close application when the user clicks the X
    s.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    s.show();
    s.solve(s);
}


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Sudoku Backtracking Non valid Sudoku

Sudoku Backtracking Non valid Sudoku


By : Maximiliano Torchio
Date : March 29 2020, 07:55 AM
Hope this helps Surely when you hit the sudo[row][col] = 0 ; code you have just finished trying every value in a square and found no solution with any of them. Surely that is the point where you decide to give up with a no-solution state.
Thinking about it further - I suspect I am only nearly right. If you hit this code and this is the first cell you are trying (i.e. the first empty cell you found) then that is your fail moment.
code :
public class Test {

    static final int S = 9;
    int[][] sudo;

    public Test() {
        // Just leave it empty.
        sudo = new int[S][S];
    }

    public Test(int[][] sudo) {
        this.sudo = sudo;
    }

    // This number should not appear anywhere in the row.
    public boolean checkHorizontal(int row, int num) {
        for (int i = 0; i < S; i++) {
            if (sudo[row][i] == num) {
                return false;
            }
        }
        return true;
    }

    // This number should not appear anywhere in the col.
    public boolean checkVertical(int col, int num) {
        for (int i = 0; i < S; i++) {
            if (sudo[i][col] == num) {
                return false;
            }
        }
        return true;
    }

    // This number should not appear anywhere in the box.
    private boolean checkBox(int row, int col, int num) {
        // Round down to nearest 3.
        int r = (row / 3) * 3;
        int c = (col / 3) * 3;
        for (int i = r; i < r + 3; i++) {
            for (int j = c; j < c + 3; j++) {
                if (sudo[i][j] == num) {
                    return false;
                }
            }
        }
        return true;
    }

    boolean check(int row, int col, int num) {
        // All checks must pass.
        return checkHorizontal(row, num)
                && checkVertical(col, num)
                && checkBox(row, col, num);
    }

    public boolean solve(int row, int col) {
        // Got to the end?
        if (row >= S) {
            //Gelöst
            return true;
        }
        // If the cell is empty
        if (sudo[row][col] == 0) {
            // Find a valid number for the empty cell
            for (int num = 1; num < 10; num++) {
                // Can this number be put there?
                if (check(row, col, num)) {
                    // Yes!
                    sudo[row][col] = num;
                    // Try that.
                    if (next(row, col)) {
                        return true;
                    }
                }
            }
            // Clean up.
            sudo[row][col] = 0;
        } else {
            // Move on.
            if (next(row, col)) {
                return true;
            }
        }
        // Failed to find a solution.
        return false;
    }

    //Ruft solve für das nächste Feld auf
    public boolean next(int row, int col) {
        if (col < S - 1) {
            // Step right.
            return solve(row, col + 1);
        } else {
            // Step down.
            return solve(row + 1, 0);
        }
    }

    public boolean boardOk() {
        // Initial test to ensure it is a valid array.
        // Must have that many rows.
        boolean ok = sudo.length == S;
        for (int row = 0; ok && row < S; row++) {
            // Each row must be that long.
            ok &= sudo[row].length == S;
            for (int col = 0; ok && col < S; col++) {
                // Each filled square must be valid.
                if (sudo[row][col] != 0) {
                    int num = sudo[row][col];
                    // Remove it.
                    sudo[row][col] = 0;
                    // Check it can be added.
                    ok &= check(row, col, num);
                    // Put it back.
                    sudo[row][col] = num;
                }
            }
        }
        return ok;
    }

    void solve() {

        if (boardOk()) {
            boolean solved = solve(0, 0);
            if (solved) {
                System.out.println("Solved!");
                print();
            }
        } else {
            System.out.println("Insoluble!");
            print();
        }
    }

    public void print() {
        for (int i = 0; i < sudo.length; i++) {
            System.out.println(Arrays.toString(sudo[i]));
        }
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        new Test().solve();
        int[][] test = {
            {0, 0, 6, 5, 8, 3, 3, 2, 7},
            {0, 0, 0, 0, 9, 0, 0, 5, 0},
            {5, 8, 0, 0, 0, 0, 0, 0, 3},
            {0, 3, 1, 0, 4, 0, 5, 0, 0},
            {0, 0, 0, 9, 2, 0, 3, 0, 6},
            {0, 0, 0, 0, 0, 0, 0, 0, 1},
            {3, 4, 2, 0, 0, 6, 9, 1, 5},
            {5, 0, 5, 4, 0, 9, 0, 3, 2},
            {0, 1, 0, 0, 0, 0, 0, 0, 4},};
        new Test(test).solve();
    }
}
Sudoku solver finding a solution for unsolvable sudoku

Sudoku solver finding a solution for unsolvable sudoku


By : Kyle
Date : March 29 2020, 07:55 AM
should help you out I have written a Sudoku solver and it works just fine when sudoku is solvable. However when sudoku is unsolvable it changes the original numbers of the puzzle when backtracking. , In the check at the beginning, when the cell is set,
code :
if (board[row][col] != 0){
    int next_col = col;
    int next_row = row;

    next_col++;

    if (next_col > 8){
        next_row++;
        next_col = 0;
    }

    if (next_row > 8){
        return true;
    } else {
        if (solve(next_row, next_col))
            return true;
    }
}
else {
    return false;
}
return solve(next_row, next_col);
Sudoku in C vs Sudoku in Java

Sudoku in C vs Sudoku in Java


By : Franklymyquestion
Date : March 29 2020, 07:55 AM
wish help you to fix your issue The simplest solution that I can think of Is "Move your unsigned code inside check() itself"
code :
int check(){
int row=0;
int col=0;
int i;
if(Unsigned(&row, &col)==0) //Move Unsigned() method code here and that's it
    return 1;
 intObj row = new intObj();
    intObj col = new intObj();
Sudoku java, efficient way for 4x4 sudoku

Sudoku java, efficient way for 4x4 sudoku


By : user3733755
Date : March 29 2020, 07:55 AM
I hope this helps . In my view the algorithm becomes simpler if you use a 1D array rather than 2D. It's trivial to print it as a table irrespective of the data structure.
Using Java 8 a possible solution could look like:
code :
private static final int SIZE = 4;
private static final int BOX = 2;
private int[] sudoko = new int[SIZE * SIZE];

private boolean hasDuplicate(int pos) {
    int value = sudoko[pos];
    return IntStream.range(0, SIZE * SIZE)
        .filter(p -> p != pos)
        .filter(p -> sameRow(p, pos) || sameCol(p, pos) || sameBox(p, pos))
        .anyMatch(p -> sudoko[p] == value);
}

private boolean sameRow(int pos1, int pos2) {
    return pos1 / DIM == pos2 / DIM;
}

private boolean sameCol(int pos1, int pos2) {
    return pos1 % DIM == pos2 % DIM;
}

private boolean sameBox(int pos1, int pos2) {
    return pos1 / SIZE / BOX == pos2 / SIZE / BOX && pos1 % SIZE / BOX == pos2 % SIZE / BOX;
}
Java Sudoku Solver, does it work the same with different sudoku sizes?

Java Sudoku Solver, does it work the same with different sudoku sizes?


By : DK Sharma
Date : March 29 2020, 07:55 AM
I hope this helps you . I have a sudoku solver that works with 9x9 sudokus perfectly. I would like to get it to work with 9x6 sudokus and other sizes too. Is it possible to just change this function? , The most primitive sudoku is a 2x2 sudoku
code :
1 2
2 1 
1 2
2 3
3 1
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