C++ Dynamically Allocated Memory Returning an Array

I am having trouble returning my two arrays that I dynamically allocate. I have an external file reading the size of the array. (20 in my case) and that is making the array size when I use the dynamically allocated arrays.

Also once I return them, is my current syntax correct or is there something that I should change.

Here is my code

int main (void)
{

    int size;
    int notFound = 0;
    int accountNumber = 0;
    int results;
    int * accountPtr = nullptr;
    double * balancePtr = nullptr;



    size = readFile(notFound, accountPtr, balancePtr);


    if (notFound == 0)
    {

     selectionSort(accountPtr, balancePtr, size);

        while  (accountNumber != -99)
            {
                cout << "Please Enter an Account Number (Type -99 to quit): ";
                cin >> accountNumber;

                if (accountNumber == -99)
                {
                    cout << "Goodbye!" << endl;
                }
                else
                {
                    results = binarySearch(accountPtr,accountNumber,size);
                    if ( results == -1)
                    {
                        cout << "That Account Number Does Not Exist." << endl;
                    }
                    else
                    {
                        cout << "\nAccount Number" << "\t\t" << "Account Balance" << endl;
                        cout << "-----------------------------------------------" << endl;
                        cout << fixed << setprecision(2) << accountPtr[results] << "\t\t\t" << balancePtr[results] << endl << endl;
                    }
                }


            }
    }

    return 0;
}

int readFile (int &notFound, int  *accountPtr, double  *balancePtr)

{
    int size;

    ifstream inputFile;

    inputFile.open("account.txt");

    if (inputFile.fail())
    {
     cout << "The File Account.TXT was not found." << endl;
     notFound = 1;
    }
    else
    {
        inputFile >> size;

        unique_ptr<int[]> accountPtr(new int[size]);
        unique_ptr<double[]> balancePtr(new double[size]);


        for(int i = 0; i < size; i++)
        {
            inputFile >> accountPtr[i] >> balancePtr[i];
        }

    }
    return size;
}