Dsa
Stack, Queue, and Heap Patterns
A practical guide to stack, queue, deque, and heap interview problems, including monotonic stacks, BFS, sliding-window maximum, top-k, and LRU thinking
Why These Structures Matter
These patterns all answer one question:
What should be processed next?- stack answers: the most recent unresolved item
- queue answers: the oldest pending item
- deque answers: whichever end keeps the structure useful
- heap answers: the best priority item right now