## Editorial for An Exponentiation Problem

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: Ninjaclasher

There were multiple ways to solve this.

In Java or Python, there exists a standard library method that we could use to solve this exact problem.

In Python, this is:

pow(base, exponent, modulo)


In Java, this is:

BigInteger.modPow(exponent, modulo);


If you are not using the aforementioned languages, such as C/C++, you needed to code a power function. However, notice that , meaning that simply multiplying times is too slow, and will TLE. We can use a method called Exponentiation by squaring to reduce the time complexity to a sub-linear one instead of a linear one.

Time Complexity: