Swap and others concepts on CPP

// Unexpected.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <vector>
#include <algorithm>
#include <numeric>
using namespace std;

int main()
{
    int a{ 4 }, b{ 5 };
    swap(a, b);

    vector<int> evens{ 2,4,6,8, 10 };
    vector<int> odds{ 1,3,5,7,9 };

    auto v1 = evens;
    swap(v1[0], v1[1]);
    iter_swap(begin(v1), begin(v1) + 1);

    auto v2 = odds;
    swap(v1[0], v2[0]);
    iter_swap(begin(v1), find(begin(v2), end(v2), 5));

    v1 = evens;
    v2 = odds;

    swap_ranges(begin(v1), find(begin(v1), end(v1), 6), begin(v2));

    vector<int> tasks(6); //Obvious in the real life it will be objects but lets work with int a priori
    iota(begin(tasks), end(tasks), 1); //Make the vector be from 1 to 10

    auto two = std::find(begin(tasks), end(tasks), 2);//I'll get by a find but in the real life I'll use a sort of an event handler that the user clicked on item number 4. The user let it go between items 1 and 2
    auto four = std::find(begin(tasks), end(tasks), 4);//Im calling find and finding the 2 and then I'm calling find and finding the 4
    rotate(two, four, four + 1);//Now I call the rotate.

    vector<int> numbers(8);
    iota(begin(numbers), end(numbers), 1);
    auto selected = std::stable_partition(begin(numbers), end(numbers), [](int i) {return i % 2 != 0; });
    four = std::find(begin(numbers), end(numbers), 4);
    rotate(begin(numbers), selected, four);


    return 0;
}