* given a number and its permutation, how can we find out the number of transformations by which the number could be transformed into its permutation ?* * * *eg: 2315 and 5213 are given. 2315 can be transformed into 5213 in a series of 2 transformations. first swap 2 and 3. then swap 3 and 5.* * * *suggestions will be welcome .* * * *with regards,* *rahul*
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