midStacks
Balanced Parentheses Check using a Stack.
Updated Apr 28, 2026
Short answer
Push opening brackets; pop and match when closing brackets are encountered.
Deep explanation
Intermediate stack problems often involve monotonic properties or expression conversion. Push opening brackets; pop and match when closing brackets are encountered.
Real-world example
Compiler syntax checking for code blocks.
Common mistakes
- Using a single variable for min-tracking instead of a stack (fails when min is popped).
Follow-up questions
- Time complexity of sorting a stack?