Description : This method returns an iterator pointing to the first element in the set.
Example :
//Run Code To Demonstrate use of set.begin()
#include<iostream>
#include<set>
int main(){
// Create a set object holding integers
std::set<int> mySet {1,2,3,4,-5};
std::cout << *(mySet.begin()) <<std::endl;
return 0;
}