#include <iostream>
#include <algorithm>
#include <numeric>
#include <iterator>
#include <functional>
#include <cstdlib>
using namespace std;
const int SIZE = 20;
int arr[SIZE] = { -1, 1, 5, 2, -4, 0, 7, -2, 5, -9, 3,6,-9,0,-4,4,6,2,13,5 };
void Massiv()
{
cout << "new Array:" << std::endl;
copy(arr, arr + SIZE, std::ostream_iterator<int>(std::cout, " "));
cout << std::endl;

int memory= arr[0];

for (int k=0;k<SIZE-1;k++)
arr [k]=arr[k+1];
arr[SIZE-1]=memory;

cout << "new Array:" << std::endl;
copy(arr, arr + SIZE, std::ostream_iterator<int>(std::cout, " "));
cout << std::endl;}

int main()
{
Massiv();

system("pause");
return 0;
}

Второе не понял задания