Bit Manipulation - Find Two Missing Numbers
Given the final output of the XOR partitioning function is [3, 5] for n=6, arr=[1, 2, 4, 6], which of the following could be the original input array?
Given the final output of the XOR partitioning function is [3, 5] for n=6, arr=[1, 2, 4, 6], which of the following could be the original input array?
hard🔄 Reverse Engineer Q9 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand missing numbers
Output [3, 5] means these two numbers are missing from the input array.Step 2: Identify array missing 3 and 5
Among options, only [1, 2, 4, 6] excludes 3 and 5.Final Answer:
Option A -> Option AQuick Check:
Input missing 3 and 5 matches output [OK]
Quick Trick: Missing numbers are those not in input array [OK]
Common Mistakes:
MISTAKES- Confusing missing numbers with present ones
- Not verifying all elements
Trap Explanation:
PITFALL- Candidates may pick arrays containing missing numbers, invalidating output.
Interviewer Note:
CONTEXT- Tests candidate's ability to reason backwards from output to input
Master "Find Two Missing Numbers" in Bit Manipulation
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