我知道以前有几个这样的帖子,但他们没有帮助我。我正在编写一个可以解决数独的程序。我在这里找到了一个算法:http://www.heimetli.ch/ffh/simplifiedsudoku.html。我试图用java编写它,并从基于控制台的程序开始。由于某种原因它会陷入无限循环,尽管我有办法阻止它。数独求解器调试
package sudokuSolver;
public class Solver {
static int[][] board; //teh board
static boolean solved; //if the sudoku is solved
public static void main(String[] args) throws Exception
{
//establish temporary board for now
final int[][] TUE24JAN = {{0,0,9,0,0,0,8,0,0},
{0,1,0,0,2,0,0,3,0},
{0,0,0,7,0,8,0,0,0},
{2,0,0,0,8,0,0,0,7},
{0,3,0,1,0,2,0,4,0},
{4,0,0,0,7,0,0,0,5},
{0,0,0,6,0,3,0,0,0},
{0,8,0,0,9,0,0,7,0},
{0,0,6,0,0,0,9,0,0},};
final int[][] WED25JAN = {{2,5,0,0,0,0,4,0,0},
{0,0,3,1,0,0,7,0,0},
{0,0,0,0,8,4,0,6,0},
{4,0,0,0,0,0,0,8,0},
{7,0,0,0,1,0,0,0,4},
{0,3,0,0,0,0,0,0,9},
{0,9,0,6,5,0,0,0,0},
{0,0,1,0,0,9,2,0,0},
{0,0,2,0,0,0,0,4,3},};
board = TUE24JAN;
solved = false;
printBoard();
solve(0,0);
System.out.println("\n");
printBoard();
}
public static void solve(int x, int y) throws Exception
{
//catches the end of the line
if(y > 8)
{
y = 0;
x++;
}
//catches the end of the board
if(x > 8 || solved)
{
solved = true;
return;
}
//put a number in the cell
for(int i = 1; i < 10; i++)
{
if(!inRow(x, i) && !inCol(y, i) && !inBox(x, y, i) && !solved)
{
board[x][y] = i;
solve(x, y+1);
board[x][y] = 0;
}
}
}
//returns if the value is in the specified row
public static boolean inRow(int x, int val)
{
for(int i = 0; i < 9; i++)
if(board[x][i] == val)
return true;
return false;
}
//returns whether the value is in the specified column
public static boolean inCol(int y, int val)
{
for(int i = 0; i < 9; i++)
if(board[i][y] == val)
return true;
return false;
}
//returns whether the value fits based
public static boolean inBox(int x, int y, int val)
{
int row = (x/3) * 3;
int col = (y/3) * 3;
for(int r = 0; r < 3; r++)
for(int c = 0; c < 3; c++)
if(board[row+r][col+c] == val)
return true;
return false;
}
public static void printBoard()
{
for(int i = 0; i < 9; i++)
{
if(i % 3 == 0)
System.out.println("----------------------");
for(int j = 0; j < 9; j++)
{
if(j % 3 == 0)
System.out.print("|");
if(board[i][j] < 10 && board[i][j] > 0)
System.out.print(board[i][j] + " ");
else
System.out.print("- ");
}
System.out.println("|");
}
System.out.print("----------------------\n");
}
}
编辑: 因为当它终于到达一个解决方案,它改变了解决真可以让它知道不再变化值应该不明确的细胞。 我没有收到堆栈溢出错误,它只是继续运行。我不小心让它运行了一个小时,它仍然在运行,它只是一直在重复,从未达到解决的状态,并且从未达到第一个递归序列。
至于一步一步的调试,你能做到吗?我使用eclipse,但是如果有一个不同的IDE允许你逐行执行,你能告诉我吗?
您是否尝试过一步调试程序步骤揣摩为什么你一个无限循环? – assylias
@trutheality他在解决方法靠近顶部'x ++;'这将增加行。我认为他需要一个'solve(x,y);'虽然...我没有跟踪所有的代码。 – Shaded
@Shaded好的。那看起来应该可以工作。在这种情况下,无法确定无限递归在哪里...... – trutheality