Subsets & Combinations - Count Number of Max Bitwise-OR Subsets
What is the output of the same code snippet when input is [0] (single element zero)?
What is the output of the same code snippet when input is [0] (single element zero)?
medium🧾 Code Trace Q4 of Q15
Step-by-Step Solution
Solution:
Step 1: Identify subsets and their OR
Only one element 0, subsets excluding empty: {0} with OR=0.Step 2: Max OR is 0, count subsets with OR=0
Only one subset {0} with OR=0, count=1.Step 3: Check code output
Code counts subsets from mask=1 to 1<Final Answer:
Option B -> Option BQuick Check:
Single subset {0} counted, output=1 [OK]
Quick Trick: Single element zero -> one subset with OR=0 [OK]
Common Mistakes:
MISTAKES- Counting empty subset
- Assuming zero subsets
- Misunderstanding mask range
Trap Explanation:
PITFALL- Candidates often forget empty subset is excluded and count zero subsets incorrectly.
Interviewer Note:
CONTEXT- Tests boundary condition handling and code tracing on minimal input.
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