Bit Manipulation - Find Two Missing Numbers
What will the function find_two_missing_xor return for n=1 and arr=[] (empty array)?
What will the function find_two_missing_xor return for n=1 and arr=[] (empty array)?
medium🧾 Code Trace Q4 of Q15
Step-by-Step Solution
Solution:
Step 1: Calculate xor_all for n=1
xor_all = XOR of 1 = 1; arr is empty, so xor_all remains 1.Step 2: Find set_bit and partition
set_bit = 1 & (-1) = 1; Partition numbers 1 and arr (empty) by bit 1; x = 1, y = 0; Since only one number exists, the function returns [1, 0].Final Answer:
Option B -> Option BQuick Check:
Edge case with n=1 returns [1, 0] [OK]
Quick Trick: Edge cases with n=1 return correct missing number and zero [OK]
Common Mistakes:
MISTAKES- Assuming always two missing numbers
- Ignoring empty input array
Trap Explanation:
PITFALL- Candidates often forget edge cases where n < 2, causing unexpected output.
Interviewer Note:
CONTEXT- Tests candidate's handling of edge cases in XOR approach
Master "Find Two Missing Numbers" in Bit Manipulation
Want More Practice?
15+ quiz questions · All difficulty levels · Free
Free Signup - Practice All QuestionsMore Bit Manipulation Quizzes