Bit Manipulation - Single Number II (Three Copies)
What is the output of the bitwise FSM solution when the input array is [0] (single element zero)?
What is the output of the bitwise FSM solution when the input array is [0] (single element zero)?
medium🧾 Code Trace Q4 of Q15
Step-by-Step Solution
Solution:
Step 1: Trace FSM variables for input [0]
ones and twos remain 0 after processing zero.Step 2: Return value is ones = 0
Correctly identifies unique element zero.Final Answer:
Option B -> Option BQuick Check:
Zero input returns zero output correctly [OK]
Quick Trick: FSM handles zero as unique element correctly [OK]
Common Mistakes:
MISTAKES- Assuming zero causes errors
- Confusing zero with negative one
Trap Explanation:
PITFALL- Candidates sometimes think zero input breaks bitwise logic, which it does not.
Interviewer Note:
CONTEXT- Checks handling of edge case input with zero value.
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