Stack and queue
Stack
LIFO structure: last in, first out. Examples:
- balanced parentheses
- next greater element
- daily temperatures
- valid expression checks
Queue
FIFO structure: first in, first out. Examples:
- BFS traversal
- sliding window maximum
- task scheduling
- producer-consumer patterns
Problems to practice
- Valid Parentheses
- Min Stack
- Daily Temperatures
- Largest Rectangle in Histogram
- Implement Queue using Stack
- Implement Stack using Queue
- Sliding Window Maximum
Key idea
Use stack for nesting, recursion simulation, and nearest greater/lesser problems.
Can you explain it without the notes?
Stack and queue
Use your own words. Explain an example and one limitation before checking the explanation.
Check your explanation
Stack
Turn this concept into a clear answer.
Practice this conceptAdapted from 14_DSA_MASTER.md · “6. Stack and queue”. Examples are study fragments; framework behavior can depend on your version.