Consider two approaches to find the single number: (1) Sorting + linear scan, and (2) XOR-based approach. When is the sorting approach preferable over XOR?

hard⚖️ Approach Comparison Q8 of Q15

Bit Manipulation - Single Number (XOR Self-Cancellation)

AWhen input size is very large and memory is limited

BWhen elements are not integers and XOR is not applicable

CWhen the array is already sorted or nearly sorted

DWhen constant space is required

Step-by-Step Solution

Solution:

Step 1: Consider data type constraints
XOR operations require integer types; non-integer elements cannot use XOR.
Step 2: Sorting applicability
Sorting works on any comparable data type, including non-integers.
Final Answer:
Option B -> Option B
Quick Check:
Sorting preferred when XOR is not applicable due to data types [OK]

Quick Trick: Use sorting when XOR can't be applied to data types [OK]

Common Mistakes:

MISTAKES

Confusing space/time trade-offs
Assuming XOR always better

Trap Explanation:

PITFALL

Candidates confuse space/time trade-offs, thinking sorting is always better.

Interviewer Note:

CONTEXT

Tests trade-off reasoning between approaches and data type constraints.

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More Bit Manipulation Quizzes

Consider two approaches to find the single number: (1) Sorting + linear scan, and (2) XOR-based approach. When is the sorting approach preferable over XOR?

Step 1: Consider data type constraints

Step 2: Sorting applicability

Final Answer:

Quick Check:

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