Bit Manipulation - Reverse Bits
Given the final reversed 32-bit integer output 964176192, which of the following was the original input?
Given the final reversed 32-bit integer output 964176192, which of the following was the original input?
hard🔄 Reverse Engineer Q9 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand output
Output 964176192 corresponds to reversed bits of some input.Step 2: Reverse engineer input
Reversing 964176192 bits again yields 43261596, the original input.Final Answer:
Option A -> Option AQuick Check:
Known example: reverseBits(43261596) -> 964176192 [OK]
Quick Trick: Reversing output bits recovers original input [OK]
Common Mistakes:
MISTAKES- Assuming output equals input
- Confusing reversed and original values
Trap Explanation:
PITFALL- Candidates may not realize reversing twice returns original input.
Interviewer Note:
CONTEXT- Tests deep understanding of bit reversal as an involution.
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