#include <iostream>
using namespace std;

int * fun(int* a, int n){
    int result[n];
    for (int i = 0; i < n; i++){
        result[i] = 2*a[i];
    }
    return result;
}

int main(){
    int a[10];
    for(int i = 0; i < 10; i++){
        a[i] = i;
    }
    int *b = fun(a, 10);
    for (int i = 0; i < 10; i++){
        cout << b[i] << endl;
    }
}