>>> def m(n,a,b,c):
... if n==1:
... print(a,'-->',c)
... else:
... m(n-1,a,c,b)
... m(n-1,b,a,c)
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weiqing1230
>>> def m(n,a,b,c):
... if n==1:
... print(a,'-->',c)
... else:
... m(n-1,a,c,b)
... print(a,'-->',c)
... m(n-1,b,a,c)