giúp em với ạ. Em cảm ơn. c++

#include <iostream>

using namespace std;

int main()

{

int n;

cout << "Nhap so luong phan tu mang: ";

cin >> n;

int a[n];

cout << "Nhap cac phan tu mang:\n";

for (int i = 0; i < n; i++)

{

cin >> a[i];

}

int maxGCD = 0;

int index1, index2;

for (int i = 0; i < n-1; i++)

{

for (int j = i+1; j < n; j++)

{

int gcd = 1;

for (int k = 1; k <= a[i] && k <= a[j]; k++)

{

if (a[i] % k == 0 && a[j] % k == 0)

{ gcd = k; }

} if (gcd > maxGCD)

{ maxGCD = gcd; index1 = i; index2 = j; }

}

}

cout << "Hai so co uoc chung lon nhat la: " << a[index1] << " va " << a[index2] << endl;

return 0; }