- def move(n, a, b, c): 
-     if n == 1: 
-         print(a, '-->', c) 
-     else: 
-     	move(n-1,a,c,b) 
-     	print(a,'-->',c) 
-     	move(n-1,b,a,c) 
-   
- # 期待输出: 
- # A --> C 
- # A --> B 
- # C --> B 
- # A --> C 
- # B --> A 
- # B --> C 
- # A --> C 
- move(3, 'A', 'B', 'C') 
-   
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