Revision history [back]

Solution via indirect sorting:

L1=[1,2,5,6,3,4,4,8,2,1,9,3,2]
L2=[1,2,2,5,6,4,3,4,8,9,1,2,3]
perm = Word(L2).standard_permutation() / Word(L1).standard_permutation()
assert [L1[i-1] for i in perm] == L2
print(perm)