midStacks
Next Greater Element problem using a Stack.
Updated Apr 28, 2026
Short answer
Maintaining a monotonic stack to find the next larger value in O(n).
Deep explanation
Intermediate stack problems often involve monotonic properties or expression conversion. Maintaining a monotonic stack to find the next larger value in O(n).
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?