i think the answer is (4^n-(1+2.....(2^n-1)))%(10^9+7);but upper bound of n is 10^18; so how to find the answer?
i think the answer is (4^n-(1+2.....(2^n-1)))%(10^9+7);but upper bound of n is 10^18; so how to find the answer?
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If I am not mistaken the answer is
.
You can calculate 4n and 2n using binpow algorithm.