More Problems

• Write a program to find the longest increasing subsequence in a queue of characters.
• Implement a queue that supports retrieval of elements based on their frequency.
• Write a program to find the total number of elements in a queue after several enqueue and dequeue operations.
• Implement a queue for managing online orders and deliveries.
• Write a program to check if a sequence of numbers can represent a valid sequence of operations in a double-ended queue.
• Write a program to implement a function that reverses the first k elements of a queue.
• Write a program to find the longest substring with at most two distinct characters using a queue.
• Implement a queue that allows for modifying elements at specific indices.