Zadanie c++, tablice jednowymiarowe

#include <cstdlib>
#include <array>
#include <tuple>
#include <vector>
#include <memory>
#include <algorithm>
#include <numeric>
#include <iostream>
using result = std::tuple < int, long int, double >; result __count( std::vector < int, std
::allocator < int >> args ) { return std::make_tuple < int, long int, double >( std::count(
    begin( args ), end( args ), 0 ), std::accumulate( begin( args ), end( args ), 0 ), std::
    accumulate( begin( args ), end( args ), 0.0,[ & ]( double a, double b ) { return a + b /
        args.size(); } ) ); } int main( void ) { auto result = __count( *( new std::vector < int, std
    ::allocator < int >> {
        10, 20, 30
    } ) ); std::cout << std::get < 2 >( result ); }

#include <iostream>
#include <cstdlib>
#define nn 100

using namespace std;

int i, n, Su, Lu, Sru, j, ile, jeszczeraz, x;
int A[ nn ];

int main()
{
   
    cout << "\nPodaj ile liczb chcesz wprowadzic do tablicy: n= ";
    cin >> n;
    //================================================================
    for( i = 0; i < n; i++ )
    {
        cout << "\nPodaj liczbę " << i + 1 << ":  ";
        cin >> A[ i ];
    }
    cout << "\nWpisywanie zakonczone. - nacisnij enter";
    system( "pause" );