Which of the following problems CANNOT be solved efficiently using the XOR self-cancellation pattern?

easy🔍 Pattern Recognition Q2 of Q15

Bit Manipulation - Single Number (XOR Self-Cancellation)

AFind the two unique numbers in an array where every other element appears twice

BFind the element that appears only once when all others appear twice

CFind the majority element that appears more than half the time in an array

DFind the single number in an array where every other element appears twice

Step-by-Step Solution

Solution:

Step 1: Analyze problem requirements
Majority element requires counting frequency, not cancellation.
Step 2: XOR pattern applicability
XOR cancels pairs but cannot identify majority elements without counting.
Final Answer:
Option C -> Option C
Quick Check:
Majority element needs frequency counts, not XOR [OK]

Quick Trick: XOR can't find majority elements [OK]

Common Mistakes:

MISTAKES

Trap Explanation:

PITFALL

Candidates often think XOR solves all uniqueness problems, but majority element needs counting.

Interviewer Note:

CONTEXT

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