#include <iostream>
#include <algorithm>
using namespace std;
int main()
{
    int* ptrarr = new int[12];
    for (int i = 0; i < 12; i++)
    {
        ptrarr[i] = i + 1;
    }
    for (int i = 0; i < 12; i+=2)
    {
        swap(ptrarr[i], ptrarr[i + 1]);
    }
    for (int i = 0; i < 12; i++)
    {
        cout << ptrarr[i] << ' ';
    }
    delete[]ptrarr;
}