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You are given a sequence of integers representing bytes. Which algorithmic pattern is best suited to verify if this sequence forms a valid UTF-8 encoding?

easy🔍 Pattern Recognition Q1 of Q15

Bit Manipulation - UTF-8 Validation

You are given a sequence of integers representing bytes. Which algorithmic pattern is best suited to verify if this sequence forms a valid UTF-8 encoding?

ASingle pass with a continuation byte counter using bitmasking

BSorting bytes and then validating byte order

CDivide and conquer by splitting the byte array recursively

DSliding window to check overlapping byte groups

Step-by-Step Solution

Solution:

Step 1: Understand UTF-8 encoding rules
UTF-8 encoding requires checking leading bits to determine character length and verifying continuation bytes.
Step 2: Identify the pattern that efficiently tracks continuation bytes
The single pass with a continuation byte counter uses bitmasking to check leading bits and counts remaining continuation bytes, making it optimal.
Final Answer:
Option A -> Option A
Quick Check:
Single pass with continuation counter matches UTF-8 validation logic [OK]

Quick Trick: UTF-8 validation needs single pass bitmask counting [OK]

Common Mistakes:

MISTAKES

Thinking sorting helps validate UTF-8
Using recursion unnecessarily
Ignoring continuation byte count

Trap Explanation:

PITFALL

Candidates often confuse UTF-8 validation with sorting or recursion, but bitmasking with counters is key.

Interviewer Note:

CONTEXT

Tests candidate's ability to recognize bitmasking pattern for encoding validation.

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