Bit Manipulation - Single Number II (Three Copies)
Given the following code, what is the value of
ones after processing the input [2, 2, 3, 2]?Given the following code, what is the value of ones after processing the input [2, 2, 3, 2]?
easy🧾 Code Trace Q12 of Q15
Step-by-Step Solution
Step 1: Trace variable updates for each num
After processing 2,2,3,2, the variable 'ones' ends up holding the unique number 3.Step 2: Confirm final return value
The function returns 'ones' which is 3, the single number appearing once.Final Answer:
Option A -> Option AQuick Check:
Output matches expected unique element 3 [OK]
Quick Trick: Final 'ones' holds the unique element after all iterations [OK]
Common Mistakes:
MISTAKES- Confusing 'ones' and 'twos' variables
- Off-by-one iteration errors
Trap Explanation:
PITFALL- Candidates often mistake intermediate states or final variable returned.
Interviewer Note:
CONTEXT- Tests ability to mentally execute bitwise FSM code correctly
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