19_vector.cpp

#include<iostream>
#include<vector>
#include<bits/stdc++.h>
using namespace std;

int main(){

    vector<int> v;
    v.push_back(1);
    v.push_back(2);
    v.push_back(3);

    for(int i=0;i<v.size();i++){
        cout<<v[i]<<" ";
    }
    cout<<endl;

    vector<int>::iterator it;
    for(it=v.begin();it!=v.end();it++){
        cout<<*it<<" ";
    }
    cout<<endl;

    for(auto element:v){
        cout<<element<<" ";
    }
    cout<<endl;

    v.pop_back();
    for(auto element:v){
        cout<<element<<" ";
    }
    cout<<endl;

    vector<int> v2 (3,50);
    for(auto element:v2){
        cout<<element<<" ";
    }
    cout<<endl;

    swap(v,v2);
    for(auto element:v){
        cout<<element<<" ";
    }
    cout<<endl;

    for(auto element:v2){
        cout<<element<<" ";
    }

    sort(v.begin(),v.end());
}