Answers for "c++ stl vector"

c++ vector

#include <vector>

int main() {
  std::vector<int> v;
  v.push_back(10); // v = [10];
  v.push_back(20); // v = [10, 20];
  
  v.pop_back(); // v = [10];
  v.push_back(30); // v = [10, 30];
  
  auto it = v.begin();
  int x = *it; // x = 10;
  ++it;
  int y = *it; // y = 30
  ++it;
  bool is_end = it == v.end(); // is_end = true
  
  return 0;
}

C++ stl vector basic

#include <iostream>
#include <vector>
using namespace std;

int main()
{
    vector<int> v;
    vector<int> a(5,1);
    vector<int> last(a);
    cout<<"Print last"<<endl;
    for(int i:last){
        cout<<i<<" ";
    }cout<<endl;
    cout<<"capacity "<<v.capacity()<<endl;
    v.push_back(1);
    cout<<"capacity "<<v.capacity()<<endl;
    v.push_back(2);
    cout<<"capacity "<<v.capacity()<<endl;
    v.push_back(3);
    cout<<"capacity "<<v.capacity()<<endl;
    cout<<"size "<<v.size()<<endl;
    cout<<"Element at second index "<<v.at(2)<<endl;
    cout<<"front "<<v.front()<<endl;
    cout<<"back "<<v.back()<<endl;
    
   
}