Bit Manipulation - Reverse Bits
Suppose you need to reverse bits of an arbitrarily large integer (not fixed 32 or 64 bits). Which approach fundamentally changes compared to the fixed-width bit reversal methods?
Suppose you need to reverse bits of an arbitrarily large integer (not fixed 32 or 64 bits). Which approach fundamentally changes compared to the fixed-width bit reversal methods?
hard🎤 Interviewer Follow-up Q10 of Q15
Step-by-Step Solution
Solution:
Step 1: Analyze fixed-width methods
Divide and conquer masks and cache lookup rely on fixed bit widths and constants.Step 2: Consider arbitrary size
For arbitrary large integers, recursion to reverse bits in chunks is needed to handle variable size.Step 3: Identify fundamental change
Recursion allows processing variable-length inputs by dividing into manageable parts.Final Answer:
Option D -> Option DQuick Check:
Fixed-width methods don't scale; recursion handles arbitrary sizes [OK]
Quick Trick: Arbitrary size requires recursive chunk processing [OK]
Common Mistakes:
MISTAKES- Trying fixed masks on variable size
- Ignoring recursion for large inputs
Trap Explanation:
PITFALL- Candidates often try fixed-width tricks on arbitrary sizes, which fail.
Interviewer Note:
CONTEXT- Tests ability to adapt bit manipulation to variable input sizes.
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