More Problems

• Write a program to find the longest subsequence of characters that can be formed from a queue.
• Implement a queue for managing event registrations in a conference.
• Write a program to check if two queues can represent a valid sequence of stack operations.
• Implement a queue that allows retrieving the minimum element efficiently.
• Write a program to find the first non-repeating character in a queue after multiple operations.
• Implement a circular queue for managing project tasks.
• Write a program to find the sum of elements in a queue after removing all duplicates.
• Implement a function that uses a queue to find all permutations of a string.