help for dealing big numbers in c++

I am new to c++ , and was going through question factorisation of september challenge which required concept of big num arithmetic .May someone please provide me some online material for understanding big num arithmetic in c++.Problem link:
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Here is how you implement it : I, II

here is an implementation in c++ : I

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May you please provide me with some more resources about the class developed in c++ as in this question we have to scan numbers > 10^20

Basically, the concept is that you proceed in the same way that you used to do when you multiplied, added of subtracted two numbers in elementary school. Read the 2nd tutorial carefully.