Stock-order processing

Stock is 9. Requests are 4, 0, 6, 5. A positive request is accepted only if it fits. Give Stock after each request.

With Stock = 5, valid request quantities are 1 to 5. Give four boundary test quantities in ascending order, including just-outside values.

Read initial Stock (non-negative), N (1 to 6), then N requested quantities. A request must be positive and no greater than current Stock. For each request output accepted and subtract it, or rejected and leave Stock unchanged. Finally output Stock.