//Use of the std::iter_swap.

#include <stdio.h>
#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
int main()
{vector<int> v1;
    int i;

    for (i = 0; i < 200; ++i) {
        v1.push_back(i);
    }

    vector<int>::iterator i1, i2;

    i1 = v1.begin();
    i2 = v1.end() - 1;

    // Swap
    std::iter_swap(i1, i2);

    for (i = 0; i < 200; ++i) {
        cout << v1[i] << " ";
    }

    return 0;
}