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Suppose the UTF-8 validation problem is extended to handle a continuous stream of bytes arriving incrementally. Which approach best adapts to this scenario?

hard🎤 Interviewer Follow-up Q10 of Q15

Bit Manipulation - UTF-8 Validation

Suppose the UTF-8 validation problem is extended to handle a continuous stream of bytes arriving incrementally. Which approach best adapts to this scenario?

ABrute force checking each byte independently without state

BBitmasking with predefined masks but restarting validation on each chunk

CSingle pass with continuation byte counter maintaining state across chunks

DSorting bytes in each chunk before validation

Step-by-Step Solution

Solution:

Step 1: Understand streaming constraints
Streaming requires maintaining state between chunks to validate multi-byte characters.
Step 2: Evaluate approaches
Single pass with continuation counter can maintain state, but sorting bytes breaks byte order and is invalid.
Step 3: Identify best approach
Maintaining continuation byte counter state across chunks is optimal; sorting disrupts encoding.
Final Answer:
Option D -> Option D
Quick Check:
Stateful single pass adapts best to streaming [OK]

Quick Trick: Maintain state across chunks for streaming validation [OK]

Common Mistakes:

MISTAKES

Restarting validation each chunk
Sorting bytes breaks encoding

Trap Explanation:

PITFALL

Candidates mistakenly think sorting or stateless checks work for streams, but stateful tracking is needed.

Interviewer Note:

CONTEXT

Tests ability to adapt algorithms to streaming data scenarios.

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