array rotation function by hackerrank code example

Example: arrays left rotation hackerrank solution

int n,d;
    cin>>n;
    int a[n];
    cin>>d;
    for(int i=0;i<n;cin>>a[i],i++);
    d=d%n;
    for(int i=d;i<n;i++)
        cout<<a[i]<<" ";
    
    for(int i=0;i<d;i++)
         cout<<a[i]<<" ";
    return 0;