Sudoku Solver
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public class Solution {
public void solveSudoku(char[][] board) {
solve(board);
}
private boolean solve(char[][] board) {
for (int i = 0; i < 9; i++) {
for (int j = 0; j < 9; j ++) {
if (board[i][j] =='.') {
for (char k = '1'; k <= '9'; k++) {
board[i][j] = k;
if (isValid(board, i, j) && solve(board)) {
return true;
}
board[i][j] = '.';
}
return false;
}
}
}
return true;
}
private boolean isValid(char[][] board,int x, int y ) {
boolean [][] square = new boolean[9][9];
for (int i = 0; i < 9; i++) {
if (y != i &&board[x][y] == board[x][i]){
return false;
}
}
for (int i = 0; i < 9; i++) {
if (x != i &&board[i][y] == board[x][y]){
return false;
}
}
for (int i = (x / 3) * 3; i < (x / 3) * 3 + 3; i++) {
for (int j = (y /3) * 3; j < (y / 3) *3 + 3; j++) {
if (x != i && y != j && board[i][j] == board[x][y]) {
return false;
}
}
}
return true;
}
}
public void solveSudoku(char[][] board) {
solve(board);
}
private boolean solve(char[][] board) {
for (int i = 0; i < 9; i++) {
for (int j = 0; j < 9; j ++) {
if (board[i][j] =='.') {
for (char k = '1'; k <= '9'; k++) {
board[i][j] = k;
if (isValid(board, i, j) && solve(board)) {
return true;
}
board[i][j] = '.';
}
return false;
}
}
}
return true;
}
private boolean isValid(char[][] board,int x, int y ) {
boolean [][] square = new boolean[9][9];
for (int i = 0; i < 9; i++) {
if (y != i &&board[x][y] == board[x][i]){
return false;
}
}
for (int i = 0; i < 9; i++) {
if (x != i &&board[i][y] == board[x][y]){
return false;
}
}
for (int i = (x / 3) * 3; i < (x / 3) * 3 + 3; i++) {
for (int j = (y /3) * 3; j < (y / 3) *3 + 3; j++) {
if (x != i && y != j && board[i][j] == board[x][y]) {
return false;
}
}
}
return true;
}
}
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