How to reduce Space Complexity from O(n) to O(1) in DP?
Updated Apr 28, 2026
Short answer
Only store the previous two values instead of an entire array.
Deep explanation
Intermediate Fibonacci techniques focus on Dynamic Programming. Only store the previous two values instead of an entire array.
Real-world example
Caching web service responses to identical queries.
Common mistakes
- Forgetting to pass the memo object in recursive calls.
Follow-up questions
- What is the time complexity with memoization?