Hi, and thanks for possible help in advance.
Here's my dilemma. I've been making a sudoku generator, and I'm now stuck on one part. I must be able to take a 'solution' and verify that it is correct, by checking a few things.
1. There are enough numbers, no 'periods' which signify '0' or 'no input'.
2. That there are no duplicate numbers in any row, column, or 3x3 box.
I have been thinking of ways to do this and I've come up with 2 things. Firstly is this bit of code. When I put i in, however, it won't work.
//requires that you only allow valid input of characters 1-n where n is the size of the board
- private boolean validateSudoku(int[][] b)
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{
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for (int i = 0; i < b.length; i++) {
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String row = "";
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String col = "";
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for (int j = 0; j < b[i].length; j++) {
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if(!row.contains(b[i][j] + ""))
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row +=b[i][j] + "";
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if(!col.contains(b[j][i] + ""))
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row += b[j][i] + "";
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if(row.length() + col.length() != b.length + b[0].length)
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return false;
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}
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}
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return true;
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}
The Second is this pseudo code I've created, and although sure this method is better, I can't seem to figure out how to make this happen.
Quote:
take an array with 9 numbers; this represents a row, or a column, or a 3x3 square, whatever, call this listArray
if listArray is not exactly 9 elements long, it's invalid, so return false
create blank array, call this testArray
for each number in listArray:
if testArray contains this number:
listArray is invalid
return false
else:
add this number to testArray
return true
Oh here's my full code I've done so far by the way.
- public class Sudoku {
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private int N = 3; //sets 'N'. This can be changed to make bigger/smaller sudoku
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private int[][]board; // creates the board.
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private int square = N*N;
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public static void main (String []Args){
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Sudoku s1 = new Sudoku();
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s1.show();
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s1.isSolution();
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}
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public Sudoku(){ //constructor
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board = new int [square][square]; //Sets the overall size of the board.
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for (int i=0; i< square; ++i){
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for(int j=0; j< square; ++j){
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board [i][j]=0; // Goes through all columns and rows, sets it to 0
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}
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}
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}
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public int getSquare(int i, int j){ // Gets the value of board[i][j]
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if(i >=0 && i< square && j>=0 && j<square)
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return board[i][j];
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else
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return 0;
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}
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public void setSquare(int i, int j, int val){// Sets board[i][j] = val.
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board [i][j] = val;
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}
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public void show() {
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for (int i=0; i< square; ++i){
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if (i%3 == 0 && i > 0)
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System.out.println("------+------+------");
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for(int j=0; j< square; ++j){
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if (board [i][j] == 0)
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System.out.print(" .");
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else
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System.out.print(" " + board [i][j]);
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if ((j+1)%3 == 0 && j < square -1)
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System.out.print("|");
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}
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System.out.println();
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}
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}
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public boolean isSolution(){
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-
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}
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}
I'm getting kinda frustrated and a point in the right direction or even some help would be greatly appreciated. Thank you for your time and help.
