So this is a follow up question to this one:
From given row(x),column(y), find 3x3 subarray of a 2D 9x9 array
I'm writing a method that takes the row, column combination of a 2D array, scans the rows, columns and 3x3 subarrays for possible solutions at this specific position. So far, everything looks good. The first for-loop scans the row and stores already used numbers (between 1-9) in an alreadyInUse array. The second does the same for the column. The third for-loop determines the position of the subarray using the row,column combination, searches this 3x3 subarray and stores already found numbers in same alreadyInUse array.
// Method for calculating all possibilities at specific position
public int[] getPossibilities(int row, int col){
int [] alreadyInUse;
int [] unsorted = new int[9];
int currentIndex = 0;
int size = 0;
boolean match;
if(sudoku[row][col] != 0){
return new int[]{sudoku[col][row]};
}
else{
alreadyInUse = new int[26];
//Go into Row x and store all available numbers in alreadyInUse
for(int i=0; i<sudoku.length; i++){
if(sudoku[row][i] !=0){
alreadyInUse[currentIndex] = sudoku[row][i];
currentIndex++;
}
}
//Go into Column y and store all available numbers in alreadyInUse
for(int j=0; j<sudoku.length; j++){
if(sudoku[j][col] !=0){
alreadyInUse[currentIndex] = sudoku[j][col];
currentIndex++;
}
}
//Go into subarray and store all available numbers in alreadyInUse
int x_left = row - (row%3);
int y_top = col - (col%3);
for(int i=0; i<3; i++){
for(int j=0; j<3; j++){
if(sudoku[i+x_left][j+y_top] != 0){
alreadyInUse[currentIndex] = sudoku[i+x_left][j+y_top];
}
}
}
//compare 1-9 with the numbers stored in alreadyInUse array
for(int i=1; i<10; i++){
match = false;
//if a pair matches, break;
for(int j=0; j<alreadyInUse.length; j++){
if(alreadyInUse[j] == i ){
match = true;
break;
}
}
//If no pair matches, store the number (i) in an unsorted array
if(!match){
size++;
unsorted[i-1] = i;
}
}
//Re-use alreadyInUse array
alreadyInUse = new int[size];
size = 0;
//Remove the zeros and store the rest of the numbers in alreadyInUse array
for(int i=0; i<unsorted.length; i++){
if(unsorted[i] != 0){
alreadyInUse[size] = unsorted[i];
size++;
}
}
return alreadyInUse;
}
}
When i test the output like this:
public class SudokuTest {
public static void main(String[] args){
Sudoku sudoku;
String sud = "250030901010004000407000208005200000000098100040003000000360072070000003903000604";
sudoku = new Sudoku(sud);
System.out.println(sudoku.getPossibilities(3,4));
I get this as an output: [I@659e0bfd even though the debug shows me that alreadyInUse array contains the correct values. Can anybody help out here?
