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edited | 190 views
0
C ?
0
Yes but how?
+3
Actually even I saw $IP^{-1}$ for first time n don't know for sure.. but here by observation..
If you make values as indices and indices as value then you will get $IP^{-1}$
for eg:- in IP at index 0, 5 is present.. then in  $IP^{-1}$ at index 5, 0 should be there.
in IP at index 1, 8 is present.. then in  $IP^{-1}$ at index 8, 1 should be there... and so on
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That was a nice reasoning. Thanks.

initial permutation for an index: for example 0th; goto 0 in given IP return it's index.

and here the answer is C