Prefix Sum vs Brute Force
Learn when to use each pattern and make the right choice in your coding interview.
Quick Answer
Use Prefix Sum when the problem fits prefix-sum pattern
Use Brute Force when the problem fits brute-force pattern
Side-by-Side Comparison
Prefix Sum
Best For
Various algorithmic problems
Time
Varies
Space
Varies
Brute Force
Best For
Various algorithmic problems
Time
Varies
Space
Varies
How to Decide
- Analyze the problem constraints
- Consider time/space trade-offs
- Look for pattern triggers
Practice Both Patterns
Build intuition to recognize which pattern fits. Practice with interactive MCQs in LeetEye.
Download LeetEye Free