#include <iostream>
using namespace std;
int main(){
    int n;
    cin >> n;
    int a[n];
    for (int i=1; i<=n; i++){
        cin >> a[i];
    }
    cout << a[1] << " " << a[3] << " " << a[7] << endl;
    for (int i=1; i<=n; i++){
        cout << a[i] << " ";
    }
}

$\color{green}{\text{Cần code Python, Java, C#, JavaScript thì nói để mình thêm}}$

$\color{red}{\text{#Daoanhviet96}}$

Uses crt;

var a: array[1..10] of integer;

i,n: integer;

begin

clrscr;

write ('nhap so luong phan tu: ');  readln (n);

writeln ('Nhap day:');

for i:=1 to n do readln (a[i]);

writeln ('Day mang vua nhap: ');

for i:=1 to n do write (a[i]:4);

writeln;

writeln ('So o vi tri [1]: ',a[1]);

writeln ('So o vi tri [3]: ',a[3]);

writeln ('So o vi tri [7]: ',a[7]);

readln;

end.

$#Trumtinhoc$