You are designing a prioritization algorithm for an online retailer. We receive a stream of user
requests each of which has an associated accountId. There is a group of 100 accountIds that are
"Big Spenders" and we want to prioritize them into the "High Priority Queue". All other users
are sent to the "Normal Priority Queue". Provide an efficient pseudo-code algorithm with two
functions:
1. Insert: when given a user, choose the appropriate queue to send them to
2. Poll: when a representative becomes available, get the next user (high priority should always
be prioritized)