I'm trying to sort an array of numbers in ascending order and don't know whats wrong with my code (I'm completely new to vectors). I should first copy the input array (data) into an STL vector, then apply STL’s sorting algorithm to the vector, and finally copy the vector back into the array.

```
void STLSort(int data[],int size)
{
vector<int> a1;
a1.reserve(size);
for(int i=0;i<size;i++)
a1[i]=data[i];
sort(a1.begin(),a1.end());
for(int i=0;i<size;i++)
data[i]=a1[i];
}
```

Thanks.