Editorial for DMOPC '16 Contest 4 P1 - Fast Exponents

Remember to use this editorial only when stuck, and not to copy-paste code from it. Please be respectful to the problem author and editorialist.
Submitting an official solution before solving the problem yourself is a bannable offence.

Author: Kirito

There are many possible solutions, one of which uses the fact that x \mathbin\& (x-1) = 0 for any power of two. The proof is left to the reader as an exercise.


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