Which of the following problems CANNOT be efficiently solved using the XOR-based missing number pattern?

easy🔍 Pattern Recognition Q2 of Q15

Bit Manipulation - Find the Missing Number

AFind the single missing number in an array of distinct integers from 0 to n

BFind the missing number when multiple numbers are missing from 0 to n

CFind the missing number when exactly one number is missing from 0 to n

DFind the missing number in an array with distinct numbers from 0 to n

Step-by-Step Solution

Solution:

Step 1: Analyze problem constraints
XOR approach works only when exactly one number is missing and all others are distinct.
Step 2: Identify limitation
When multiple numbers are missing, XOR cannot isolate a single missing number, so it fails.
Final Answer:
Option B -> Option B
Quick Check:
Multiple missing numbers break XOR cancellation logic [OK]

Quick Trick: XOR only isolates one missing number [OK]

Common Mistakes:

MISTAKES

Trap Explanation:

PITFALL

Candidates often think XOR can handle multiple missing numbers, but it cannot isolate more than one missing value.

Interviewer Note:

CONTEXT

Tests candidate's understanding of XOR approach limitations and anti-pattern recognition.

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