def move(n,a,b,c):
if n==1:
print(a,'->',c)
else:
move(n-1,a,c,b)
move(n-1,b,a,c)
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海淀非典型帅哥
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)