midQueues
Reverse the first K elements of a Queue.
Updated Apr 28, 2026
Short answer
Use an auxiliary stack to flip the first K elements, then rotate the rest.
Deep explanation
Mid-level queue concepts involve specific optimizations and algorithm integration. Use an auxiliary stack to flip the first K elements, then rotate the rest.
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?