Stack and queue
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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.
Adapted from 14_DSA_MASTER.md · “6. Stack and queue”. Code examples are study fragments. Difficulty and core labels are editorial estimates; version-specific behavior should be checked against your project.