#include <vector>
using namespace std;

int main() {
    vector<int> v1;

    v1.push_back(5);
    v1.push_back(10);
    v1.push_back(3);
    v1.push_back(1);

    cout << "Vector size: " << v1.size() << endl << endl;

    /* Pre-C++11 / C++0x */
    for (vector<int>::iterator i = v1.begin(); i < v1.end(); i++)
        cout << *i << endl;

    cout << endl;

    /* C++11 */
    for (auto i = v1.begin(); i < v1.end(); i++)
        cout << *i << endl;

    cout << endl;

    /* C++11 “for each” */
    for (int i : v1)
        cout << i << endl;
    
    cout << endl;

    /* C++11 */
    vector<int> v2 {5, 10, 3, 1, 20};

    if (v1 == v2)
        cout << "Vectors are equal" << endl;
    else
        cout << "Vectors are not equal" << endl;

    v2.pop_back();

    if (v1 == v2)
        cout << "Vectors are equal" << endl;
    else
        cout << "Vectors are not equal" << endl;

   /* #include <algorithm> */
   sort(v1.begin(), v1.end());

   vector<pair<int, string> > vt;
   sort(vt.begin(), vt.end());