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我試圖編寫一個在Java或Javascript中創建合法Sudoku板的算法。既不工作，也不完全確定爲什麼。Sudoku生成器的遞歸解決方案
從本質上講，這兩個程序的問題是，要麼x或y增加超過它應該（跳過正方形）。我不能爲了我的生活而弄清楚這是怎麼發生的。如果需要，我可以提供完成JS解決方案的HTML。
我最好的猜測是它與我如何使用遞歸創建堆棧有關，但據我所知，它應該應該工作。 在我的舊代碼中有一個不正確的循環，我意識到這一點。我粘貼了一箇舊版本，現在已經修復。
的Java：
import java.util.*;
public class SudokuGenerator
{
//credit:cachao
//http://stackoverflow.com/questions/9959172/recursive-solution-to-sudoku-generator
public static final int BOARD_WIDTH = 9;
public static final int BOARD_HEIGHT = 9;
public SudokuGenerator() {
board = new int[BOARD_WIDTH][BOARD_HEIGHT];
}
//Recursive method that attempts to place every number in a square
public int[][] nextBoard()
{
nextBoard(0,0);
return board;
}
public void nextBoard(int x, int y)
{
int nextX = x;
int nextY = y;
//int[] toCheck = Collections.shuffle(Arrays.asList({1,2,3,4,5,6,7,8,9}));
int[] toCheck = {1,2,3,4,5,6,7,8,9};
Collections.shuffle(Arrays.asList(toCheck));
for(int i=0;i<toCheck.length;i++)
{
if(legalMove(x, y, toCheck[i]))
{
board[x][y] = toCheck[i];
if(x == 8)
{
if(y == 8)
break;//We're done! Yay!
else
{
nextX = 0;
nextY++;
}
}
else
{
nextX++;
}
nextBoard(nextX, nextY);
}
}
board[x][y] = 0;
}
public boolean legalMove(int x, int y, int current) {
for(int i=0;i<9;i++) {
if(current == board[x][i])
return false;
}
for(int i=0;i<9;i++) {
if(current == board[i][y])
return false;
}
int cornerX = 0;
int cornerY = 0;
if(x > 2)
if(x > 5)
cornerX = 6;
else
cornerX = 3;
if(y > 2)
if(y > 5)
cornerY = 6;
else
cornerY = 3;
for(int i=cornerX;i<10 && i<cornerX+3;i++)
for(int j=cornerY;j<10 && j<cornerY+3;j++)
if(current == board[i][j])
return false;
return true;
}
public void print()
{
for(int i=0;i<9;i++)
{
for(int j=0;j<9;j++)
System.out.print(board[i][j] + " ");
System.out.println();
}
}
public static void main(String[] args)
{
SudokuGenerator sg = new SudokuGenerator();
sg.nextBoard();
sg.print();
}
int[][] board;
}
的Javascript：
//Recursive method that attempts to place every number in a square
function driver()
{
board = new Array(10);
for(var i=0;i<9;i++)
board[i] = new Array(10);
nextBoard(0,0);
print();
}
function nextBoard(x, y)
{
var nextX = x;
var nextY = y;
for(var i=1;i<10;i++) {
console.log(y + " " + x + " " + i);
document.getElementById(y + " " + x).innerHTML = i;
if(legalMove(x, y, i)) {
board[x][y] = i;
if(x === 8) {
if(y === 8)
return board;//We're done! Yay!
else {
nextX = 0;
nextY++;
}
}
else
nextX++;
nextBoard(nextX, nextY);
}
}
//This is needed for legalMove to work, otherwise [x][y] == 9
board[x][y] = undefined;
}
function legalMove(x, y, current) {
for(var i=0;i<9;i++) {
if(current === board[x][i])
return false;
}
for(var i=0;i<9;i++) {
if(current === board[i][y])
return false;
}
var cornerX = 0;
var cornerY = 0;
if(x > 2)
if(x > 5)
cornerX = 6;
else
cornerX = 3;
if(y > 2)
if(y > 5)
cornerY = 6;
else
cornerY = 3;
for(var i=cornerX;i<10 && i<cornerX+3;i++)
for(var j=cornerY;j<10 && j<cornerY+3;j++)
if(current === board[i][j])
return false;
return true;
}
function print() {
for(var i=0;i<9;i++)
for(var j=0;j<9;j++)
{
document.getElementById(i + " " + j).innerHTML = board[i][j];
console.log(board[i][j]);
}
}
var board;
將代碼放在這個問題，而不是一個引擎收錄的。 – 2012-03-31 20:20:54