Calculate The Sum

This code is giving correct answer in vs code , but it’s not able to pass any test case can some one please help.

Code

#include

using namespace std;

int main() {

long long int sum=0;

long long int n;

cin>>n;

long long int arr[n];

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

{

    cin>>arr[i];

}

long long int operations;

long long int x;

cin>>operations;

 while(operations--)

{

    cin>>x;

    

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

    {

        if(x==0)

            {

                arr[i] = arr[i] + arr[i];

            }

        else{

                arr[i] = arr[i] + x;

        }

        

    }

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

    {

       sum = sum + arr[i];

     }

    

}

 cout<<sum;

return 0;

}