Service Center Request Queue

In a service center, requests come in for repairs and can be handled in a FIFO manner. Customers can both request service and cancel their requests. Write a program that maintains the order of service requests and prints the final list of requests being processed. Input Format: - The first line contains an integer N: the number of actions. - The next N lines contain either "REQUEST <request_id>" to add a request or "CANCEL <request_id>" to cancel a request. Output Format: - Print space-separated list of IDs of requests being processed. Example: Input: 5 REQUEST R001 REQUEST R002 CANCEL R001 REQUEST R003 CANCEL R002 Output: R003