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| public class Sudo {
static char[] numbers = {'1','2','3','4','5','6','7','8','9'};
public static void main(String[] args) {
char[][] board = {{'5','3','.','.','7','.','.','.','.'},
{'6','.','.','1','9','5','.','.','.'},
{'.','9','8','.','.','.','.','6','.'},
{'8','.','.','.','6','.','.','.','3'},
{'4','.','.','8','.','3','.','.','1'},
{'7','.','.','.','2','.','.','.','6'},
{'.','6','.','.','.','.','2','8','.'},
{'.','.','.','4','1','9','.','.','5'},
{'.','.','.','.','8','.','.','7','9'}};
writeInto(board);
for(int i = 0; i < 9; i++) {
for(int j = 0; j <9; j++){
System.out.print(board[i][j]);
if(j==8){
System.out.println();
}
}
}
}
public static void writeInto(char[][] board){
int[] index = findBlank(board);
if(index[0] == 10){
return;
}
for(char number : numbers){
if(checkSelf(index[0],index[1],number,board) && checkClo(number,board,index[1]) && checkRow(number,board[index[0]])){
board[index[0]][index[1]] = number;
writeInto(board);
int[] index1 = findBlank(board);
if(index1[0] == 10){
return;
}
board[index[0]][index[1]] = '.';
}
}
}
public static int[] findBlank(char[][] board){
int[] index = {10,10};
for(int i = 0; i < 9; i++){
for(int j = 0; j < 9; j++){
if(board[i][j] == '.'){
index[0] = i;
index[1] = j;
return index;
}
}
}
return index;
}
public static boolean checkRow(char number, char[] row){
for(char n : row){
if(n == number){
return false;
}
}
return true;
}
public static boolean checkClo(char number, char[][] board, int clo){
for(int i = 0; i < 9; i++){
if(board[i][clo] == number){
return false;
}
}
return true;
}
public static boolean checkSelf(int x, int y, char number, char[][] board){
int x_range = (x / 3) * 3;
int y_range = (y / 3) * 3;
for(int i = 0; i < 3; i++){
for(int j = 0; j < 3; j++){
if(number == board[x_range + i][y_range + j]){
return false;
}
}
}
return true;
}
}
|
