Question

java中一个迷宫的程序填空问题，各位帮帮忙啊

public class Maze
{
class Cell
{
private int row;
private int col;
private Cell from;

public Cell(int row, int col, Cell from)
{
this.row = row;
this.col = col;
this.from = from;
}
}

char[][] maze =
{{'#','#','#','#','B','#','#','#','#','#','#','#'},
{'#','#','#','#','.','.','.','.','#','#','#','#'},
{'#','#','#','#','.','#','#','#','#','.','.','#'},
{'#','.','.','.','.','#','#','#','#','#','.','#'},
{'#','.','#','#','#','#','#','.','#','#','.','#'},
{'#','.','#','#','#','#','#','.','#','#','.','#'},
{'#','.','#','#','.','.','.','.','.','.','.','#'},
{'#','.','#','#','.','#','#','#','.','#','.','#'},
{'#','.','.','.','.','#','#','#','.','#','.','#'},
{'#','#','.','#','.','#','#','#','.','#','.','A'},
{'#','#','.','#','#','#','.','.','.','#','#','#'},
{'#','#','#','#','#','#','#','#','#','#','#','#'}};

public void show()
{
for(int i=0; i<maze.length; i++)
{
for(int j=0; j<maze[i].length; j++)
System.out.print(" " + maze[i][j]);
System.out.println();
}
}

//把与from集合中相邻的可染色节点染色，被染色节点记入 dest
//一旦发现出口将被染色，则返回当前的“传播源”节点
public Cell colorCell(Set<Cell> from, Set<Cell> dest)
{
Iterator<Cell> it = from.iterator();
while(it.hasNext())
{
Cell a = it.next();
Cell[] c = new Cell[4];
c[0] = new Cell(a.row-1, a.col, a);
c[1] = new Cell(a.row, a.col-1, a);
c[2] = new Cell(a.row+1, a.col, a);
c[3] = ___________________________;

for(int i=0; i<4; i++)
{
if(c[i].row < 0 || c[i].row >= maze.length) continue;
if(c[i].col < 0 || c[i].col >= maze[0].length) continue;

char x = maze[c[i].row][c[i].col];
if(x=='B') return a;
if(x=='.')
{
maze[c[i].row][c[i].col] = '?';
____________________;
}
}
}
return null;
}

public void resolve()
{
Set<Cell> set = new HashSet<Cell>();
set.add(new Cell(9,11,null));

for(;;)
{
Set<Cell> set1 = new HashSet<Cell>();
Cell a = colorCell(set, set1);
if(a!=null)
{
System.out.println("找到解！");
while(a!=null)
{
maze[a.row][a.col] = '+';
______________;
}
break;
}
if(set1.isEmpty())
{
System.out.println("无解！");
break;
}
set = set1;
}
}

public static void main(String[] args)
{
Maze m = new Maze();
m.show();
m.resolve();
m.show();
}
}

Answer 1

第一个空 new Cell(a.row, a.col+1, a);
第二个空 dest.add(new Cell(c[i].row, c[i].col, a));
第三个空 a=a.from;

下面是运行结果
# # # # B # # # # # # #
# # # # . . . . # # # #
# # # # . # # # # . . #
# . . . . # # # # # . #
# . # # # # # . # # . #
# . # # # # # . # # . #
# . # # . . . . . . . #
# . # # . # # # . # . #
# . . . . # # # . # . #
# # . # . # # # . # . A
# # . # # # . . . # # #
# # # # # # # # # # # #
找到解！
# # # # B # # # # # # #
# # # # + . . . # # # #
# # # # + # # # # ? ? #
# + + + + # # # # # ? #
# + # # # # # ? # # ? #
# + # # # # # ? # # ? #
# + # # + + + + + + + #
# + # # + # # # ? # + #
# + + + + # # # ? # + #
# # ? # ? # # # ? # + +
# # ? # # # ? ? ? # # #
# # # # # # # # # # # #