* Add fast power
Computes a^b in O(logN) time.
* Change long long to int64_t
* Update fast_power.cpp
* Update fast_power.cpp
* Add tests
* Update sample tests
* Update rand function
* Remove extra-spaces
* Prime
Here we can check prime upto 10^8 in O(1). It is very useful in Competitive programming.
* Update and rename Math/Primeupto10^8.cpp to math/primes_up_to_10^8.cpp
* long long -> int64
* cstdint::int64_t
* int64_t
* std::cin