Prime factorisation ( using optimised divisor)

#1

sir,tell me what is push
_back function and what is make_pair function and how it works.

#2

Push_back function is a inbuilt function used in the vectors… used to push the value inside the vector…
Make_pair function is defined under C++ Standard Template Library… mainly used with a pair class … Pair class has two values associated with itself …of any type…
For eg.
pair<int, string>p;

Here, we have two values inside a pair… one is integer type and other string type… and name of pair is p…

So make_pair function will be used to make any such pair…