Topic: Queue-question / Level: Advanced

• 401. Implement a circular queue using an array and demonstrate its operations.
• 402. Write a program to implement a priority queue and perform insertion and deletion.
• 403. Create a double-ended queue (deque) and demonstrate adding and removing elements from both ends.
• 404. Implement a queue using two stacks and demonstrate its operations.
• 405. Write a program to reverse a queue using recursion.
• 406. Implement a queue that supports an operation to return the maximum element in constant time.
• 407. Create a program to sort a queue using another queue.
• 408. Implement a queue that supports dynamic resizing.
• 409. Write a program to check if two queues are equal in terms of their elements and order.
• 410. Implement a queue using linked lists and demonstrate its operations.
• 411. Create a program to merge two sorted queues into one sorted queue.
• 412. Write a program to rotate a queue to the left by a given number of positions.
• 413. Implement a queue that can provide the median of elements in constant time.
• 414. Create a queue that can handle duplicate elements while maintaining the order of insertion.
• 415. Write a program to simulate a ticket booking system using queues.
• 416. Implement a queue that can count the occurrences of each element.
• 417. Create a program to implement a queue with a fixed maximum size that returns an error when full.
• 418. Write a program to find the first non-repeating character in a stream using a queue.
• 419. Implement a queue that supports the operation of removing all occurrences of a specified element.
• 420. Create a program to generate permutations of a string using a queue.
• 421. Write a program to implement a queue that can serialize and deserialize itself.
• 422. Implement a queue that can detect cycles in a stream of data.
• 423. Create a program to maintain a history of operations performed on a queue.
• 424. Write a program to implement a queue with a time limit on its elements.
• 425. Implement a queue that can perform batch operations on its elements.
• 426. Create a program to implement a multi-level queue scheduling system.
• 427. Write a program to simulate a queue in a multi-threaded environment.
• 428. Implement a queue that can sort its elements after each insertion.
• 429. Create a program to find the longest valid parentheses substring using a queue.
• 430. Write a program to implement a sliding window maximum using a queue.

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