Bit Manipulation - Single Number II (Three Copies)
Given the following code snippet implementing the bitwise FSM approach, what is the returned value for input [2, 2, 3, 2]?
Given the following code snippet implementing the bitwise FSM approach, what is the returned value for input [2, 2, 3, 2]?
easy🧾 Code Trace Q3 of Q15
Step-by-Step Solution
Solution:
Step 1: Trace variable updates for input [2,2,3,2]
After processing all elements, ones holds the unique element 3.Step 2: Confirm final return value
Return value is ones = 3, matching the unique element appearing once.Final Answer:
Option A -> Option AQuick Check:
Output matches expected unique element [OK]
Quick Trick: FSM returns unique element after processing all nums [OK]
Common Mistakes:
MISTAKES- Confusing ones and twos variables
- Off-by-one in loop iteration
Trap Explanation:
PITFALL- Candidates often misinterpret ones and twos roles, leading to wrong output guesses.
Interviewer Note:
CONTEXT- Tests candidate's ability to mentally execute bitwise FSM code.
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