#include <iostream>
#include <memory>
#include <utility>
#include <vector>

using namespace std;


int main()
{
    vector<int>  v1 ;
    v1.push_back(1) ;v1.push_back(2) ;v1.push_back(3) ;
    v1.push_back(4) ;v1.push_back(5) ;v1.push_back(6) ;
    v1.erase( v1.begin() + 1 ) ;
    for( int x1 : v1 )
      cout << x1 << " " ;
    cout << endl  ;

    // v1.begin() + 1 to one less  v1.begin() + 3
    v1.erase( v1.begin() + 1, v1.begin() + 3  ) ;

    for( int x1 : v1 )
      cout << x1 << " " ;
    cout << endl  ;


}