Bit Manipulation - UTF-8 Validation
What is the time complexity of the optimal UTF-8 validation algorithm that uses a single pass with a continuation byte counter?
What is the time complexity of the optimal UTF-8 validation algorithm that uses a single pass with a continuation byte counter?
medium🪤 Complexity Trap Q5 of Q15
Step-by-Step Solution
Solution:
Step 1: Analyze algorithm steps
The algorithm scans each byte exactly once, performing constant time bit operations.Step 2: Confirm no nested loops or recursion
No nested loops or recursion means linear time complexity.Final Answer:
Option A -> Option AQuick Check:
Single pass over n bytes -> O(n) time [OK]
Quick Trick: Single pass means O(n) time [OK]
Common Mistakes:
MISTAKES- Assuming nested loops cause O(n²)
- Confusing bit operations with sorting
Trap Explanation:
PITFALL- Candidates often mistake bit checks as nested loops causing O(n²), but each byte is processed once.
Interviewer Note:
CONTEXT- Tests understanding of time complexity in bitmask-based linear scans.
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