Problem Statement:

Mr$.$ Arun Basu, owner of a smartphone store, wants to prioritize the sale of new iPhones to his loyal customers. To

streamline the process, he maintains a queue where each customer is identified by a unique customer ID$,$ and their

priority is represented by a second integer $($lower value indicates higher priority$).$ Mr$.$ Basu needs your assistance in

implementing a priority queue using a linked list to efficiently manage iPhone sales.