#include<iostream>

#include<vector>

using namespace std;

int main()

{

system("cls");

vector<int> v;

cout<<"size: "<<v.size()<<endl;

cout<<"capacity: "<<v.capacity()<<endl;

v.push_back(1); //puts element in last place

cout<<"size: "<<v.size()<<endl;

cout<<"capacity: "<<v.capacity()<<endl;

v.push_back(2);

cout<<"size: "<<v.size()<<endl;

cout<<"capacity: "<<v.capacity()<<endl;

v.push_back(3);

cout<<"size: "<<v.size()<<endl; //3

cout<<"capacity: "<<v.capacity()<<endl; //4 why??

v.push_back(4);

v.push_back(5);

cout<<"\nBefore pop: ";

for(int i:v)

{

cout<<i<<" ";

}

v.pop_back();

cout<<"\nAfter pop: ";

for(int i:v)

{

cout<<v[i-1]<<" ";

}

cout<<"\n2nd index element: "<<v.at(2);

cout<<"\nEmpty of not: "<<v.empty();

cout<<"\nFirst element: "<<v.front();

cout<<"\nlast element: "<<v.back();

int n,a;

cout<<"\nEnter number of element: ";

cin>>n;

vector<int> z;

for(int i=0;i<n;i++)

{

cin>>a;

z.push_back(a);

}

for(int i:z)

{

cout<<i<<" ";

}

}