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SolveSudko.java
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SolveSudko.java
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// import java.io.*;
import java.util.*;
public class SolveSudko {
public static void display(int[][] board){
for(int i = 0; i < board.length; i++){
for(int j = 0; j < board[0].length; j++){
System.out.print(board[i][j] + " ");
}
System.out.println();
}
}
public static void solveSudoku(int[][] board, int i, int j) {
if(i==board.length){
display(board);
return;
}
int ni=0;
int nj=0;
if(j==board[0].length-1){
ni =i+1;
nj =0;
}else{
ni=i;
nj = j+1;
}
if(board[i][j]!=0){
solveSudoku(board, ni, nj);
}else{
for(int po=1; po<=9; po++){
if(isValid(board, i, j, po)){
board[i][j] = po;
solveSudoku(board, ni, nj);
board[i][j] = 0;
}
}
}
}
public static boolean isValid(int[][] board, int x, int y, int val){
for(int j=0; j<board[0].length; j++){
if(board[x][j]==val){
return false;
}
}
for(int i=0; i<board.length; i++){
if(board[i][y]==val){
return false;
}
}
int smi = x/3*3;
int smj = y/3*3;
for(int i=0; i<3;i++){
for(int j=0; j<3;j++){
if(board[smi+i][smj+j]==val){
return false;
}
}
}
return true;
}
public static void main(String[] args) throws Exception {
Scanner scn = new Scanner(System.in);
int[][] arr = new int[9][9];
for (int i = 0; i < 9; i++) {
for (int j = 0; j < 9; j++) {
arr[i][j] = scn.nextInt();
}
}
solveSudoku(arr, 0, 0);
}
}