Bit Manipulation - Find the Missing Number
What is the output of the XOR-based missing number function when input is [0]?
What is the output of the XOR-based missing number function when input is [0]?
medium🧾 Code Trace Q4 of Q15
Step-by-Step Solution
Solution:
Step 1: Calculate xor_all after first loop
n=1, i in [0,1]; xor_all = 0^1=1Step 2: XOR with array elements
xor_all ^= 0 -> 1^0=1Final Answer:
Option A -> Option AQuick Check:
Missing number is 1, output matches [OK]
Quick Trick: XOR includes n+1 elements, handles edge cases [OK]
Common Mistakes:
MISTAKES- Forgetting to include n in XOR
- Off-by-one in loop range
Trap Explanation:
PITFALL- Candidates often miss including n in XOR, causing wrong output for edge cases.
Interviewer Note:
CONTEXT- Tests handling of minimal input and boundary conditions in XOR approach.
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