Bit Manipulation - Reverse Bits
What is the space complexity of the brute force bit reversal algorithm that uses a loop and accumulates the result in a variable?
What is the space complexity of the brute force bit reversal algorithm that uses a loop and accumulates the result in a variable?
medium🪤 Complexity Trap Q6 of Q15
Step-by-Step Solution
Solution:
Step 1: Analyze space usage
The code uses constant variables and a loop, no recursion or extra arrays.Step 2: Consider recursion stack
Since this is iterative, no recursion stack is used, so space is constant O(1).Final Answer:
Option B -> Option BQuick Check:
Iterative loop uses constant space, no recursion stack [OK]
Quick Trick: Iterative loops use constant space, recursion adds stack space [OK]
Common Mistakes:
MISTAKES- Confusing loop variables with extra space
- Assuming recursion stack exists
Trap Explanation:
PITFALL- Candidates often forget recursion stack space or confuse loop variables as extra space.
Interviewer Note:
CONTEXT- Tests understanding of space complexity in iterative vs recursive solutions.
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