如何用Python开发拼图游戏(12)

steps

 += 

1



            

elif

 

r

 + 

1

 <= 

2

 

and

 

board

[

r

 + 

1

][

c

] 

is

 

None:

  # 判断下面

                

board

[

r

][

c

] = 

None



                

board