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POjava sudoku backtracking recursive
 

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  1. POjava sudoku backtracking recursive
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    <p>hey i have worte this program to solve sudoko but it just workd for a few cells of sudoku matrix and for other cells returns 0 . can u understand whats wrong with this? i am new in java coding and it really hurts not to be able to write a simple program.</p> <pre><code>public class sudoku { static int sud[][] = new int[9][9]; public static void main(String args[]) { for (int i = 0; i &lt; 9; i++) { for (int j = 0; j &lt; 9; j++) { sud[i][j] = 0; } } solve(sud); for (int i = 0; i &lt; 9; i++) { for (int j = 0; j &lt; 9; j++) { System.out.print(sud[i][j]); } System.out.print("\n"); } } public static boolean solve(int[][] sud) { for (int i = 0; i &lt; 9; i++) { for (int j = 0; j &lt; 9; j++) { if (sud[i][j] != 0) { continue; } for (int x = 1; x &lt; 10; x++) { if (!used(i, j, x)) { sud[i][j] = x; if (solve(sud)) { return true; } } } return false; } } return true; } public static boolean isinrow(int i, int j, int x) { for (int t = 0; t &lt; 9; t++) { if (sud[i][t] == x) { return true; } } return false; } public static boolean isincol(int i, int j, int x) { for (int t = 0; t &lt; 9; t++) { if (sud[t][j] == x) { return true; } } return false; } public static boolean isinsq(int sr, int sc, int x) { for (sr = 0; sr &lt; 3; sr++) { for (sc = 0; sc &lt; 3; sc++) { if (sud[sr][sc] == x) { return true; } } } return false; } static boolean used(int i, int j, int x) { if (!isinrow(i, j, x)) { if (!isincol(i, j, x)) { if (!isinsq(i - (i % 3), j - (j % 3), x)) { return false; } } } return true; } </code></pre> <p>}</p>
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    1. COthis is output : 123456789 456789000 000000000 000000000 000000000 000000000 000000000 000000000 000000000
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    2. COComments are your friend. Learn that lesson now!
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