1. Implement a priority queue using a binary heap.
2. Write a program to sort a queue using a stack.
3. Write a function to check if a given sequence can represent the enqueue and dequeue operations of a queue.
4. Write a program to implement a double-ended queue (deque) using a linked list.
5. Write a program to generate all binary numbers from 1 to n using a queue.
6. Write a program to implement a queue that supports both enqueue and dequeue operations in constant time.
7. Write a program to rotate a queue to the left by k elements.
8. Write a program to find the largest element in a queue without using extra space.
9. Write a program to interleave two queues.
10. Implement a circular queue with operations to enqueue and dequeue.
11. Write a program to merge two sorted queues.
12. Write a program to reverse a queue using recursion.
13. Write a program to check if two queues are equal.
14. Write a program to find the middle element of a queue.
15. Write a program to delete all occurrences of a specific element from a queue.
16. Write a program to implement a queue using two stacks.
17. Write a program to print all elements of a queue in reverse order using recursion.
18. Write a function to find the second largest element in a queue.
19. Write a program to find the sum of all elements in a queue.
20. Write a program to find the frequency of elements in a queue.
21. Write a program to find the maximum value in a sliding window using a queue.
22. Write a program to implement a queue that maintains the maximum element.
23. Write a program to implement a queue with a fixed-size array.
24. Write a program to implement a queue using a singly linked list.
25. Write a program to implement a queue using a doubly linked list.
26. Write a program to implement a queue with dynamic resizing.
27. Write a program to print the first non-repeating character from a stream using a queue.
28. Write a program to merge k sorted queues.
29. Write a program to find the longest consecutive sequence in a queue.
30. Write a program to check if a queue contains a palindrome.
31. Write a program to implement a queue that can maintain insertion order.
32. Write a program to check if a queue is empty.
33. Write a program to implement a queue with timestamped elements.
34. Write a program to find the first repeated element in a queue.
35. Write a program to implement a queue that allows peeking at both ends.
36. Write a program to implement a queue that can prioritize elements based on a custom comparator.
37. Write a program to rotate a queue in both directions.
38. Write a program to find the nth largest element in a queue.
39. Write a program to find the kth smallest element in a queue.
40. Write a program to find the longest palindrome substring in a queue.