ContanerVector2, C++ (gcc)

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//g++  7.4.0
//Container Vector: use of most of the vector member functions
//this code is created by Rezaul Hoque on September 29,2021;contact:jewelmrh@yahoo.com
//note: codes shared by Rezaul Hoque on rextester are not for sale; they are created and shared to facilitate the algorithm learning process; many like Hoque use this platform to practice programming ;Rezaul hopes his contribution helps others to fine tune their learning;
#include <iostream>
#include <vector>
using namespace std;
int main()
{
vector<int> a,b;
vector<char> c,d,e;
std::vector<char> f;
//use of get_allocator
char * p;
p=f.get_allocator().allocate(12);

for(unsigned int i=0;i<12;i++)
std::cin>>p[i];
//use of assign()
c.assign(38,'\\');
d.assign(38,'\/');
//use of push_back()
e.push_back('\n');
e.push_back('V');
e.push_back('e');
e.push_back('c');
e.push_back('t');
e.push_back('o');
e.push_back('r');
//use of emplace()
e.emplace(e.begin()+7,'\n');// use of e.begin()
e.emplace(e.begin()+8,'S');
e.emplace(e.begin()+9,'e');
e.emplace(e.begin()+10,'p');
e.emplace(e.begin()+11,'t');
e.emplace(e.begin()+12,' ');
//use of erase()
e.erase(e.begin()+8,e.begin()+12);
a.push_back(2);
a.push_back(2);
b.push_back(2);
b.push_back(0);
b.push_back(2);
b.push_back(1);
//use of clear()
a.clear();
b.clear();
//use of rbegin() and rend()
for(std::vector<char>::reverse_iterator  rit=c.rbegin();rit!=c.rend();rit++){
cout<<*rit;
}
cout<<"\n";
for( unsigned int l=0;l<d.size();l++){
{
cout<<d[l];
}
}
for(auto it=e.begin();it != e.end();it++)
cout<<*it<<" ";
for(unsigned int l=0;l<12;l++)
std::cout<<p[l];

cout<<"\n";
//use of swap()
c.swap(d);
for(unsigned int l=0;l<c.size();l++){
cout<<c[l];}
cout<<" \n";
for(unsigned int l=0;l<d.size();l++){
{
cout<<d[l];
}
}

for(unsigned int l=0;l<12;l++)
f.get_allocator().destroy(&p[l]);
f.get_allocator().deallocate(p,12);

return 0;
}

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Compilation time: 0.62 sec, absolute running time: 0.2 sec, cpu time: 0.02 sec, memory peak: 5 Mb, absolute service time: 1 sec