midQueues

Implementation of a Deque using a Doubly Linked List.

Updated Apr 28, 2026

Short answer

Allows O(1) addition/removal from both ends due to prev/next pointers.

Deep explanation

Mid-level queue concepts involve specific optimizations and algorithm integration. Allows O(1) addition/removal from both ends due to prev/next pointers.

Real-world example

Managing requests in a web server buffer.

Common mistakes

  • Forgetting to reset pointers to -1 when the last element is dequeued.

Follow-up questions

  • What is the time complexity of Heap-based PQ push?

More Queues interview questions

View all →