PHASE 05
📚 Stacks & Queues
Undo buttons, browser history, printer queues and bracket matching. Learn stacks, queues and deques, and the monotonic stack that answers “next greater element” in one pass.
⏱️ ~2 hours of lessons
📚 3 lessons
✏️ 4 exercises Medium
▶ Start this phase
🎯 In this phase you will…
- Implement and use a stack
- Implement and use a queue and deque
- Apply the monotonic stack pattern
📺 Lessons in this playlist
📝 Phase test
Concept questions, pseudocode writing, tracing and debugging — check you’re ready for the next phase.
💡 Concept check
Breadth-first search explores level by level. Which structure drives it?
