Which of the following problems CANNOT be efficiently solved using bitmasking to represent character sets and check overlaps?

easy🔍 Pattern Recognition Q2 of Q15

Bit Manipulation - Maximum Product of Word Lengths

AFind two words with no common letters maximizing product of lengths

BFind maximum product of word lengths with no overlapping letters

CFind the longest substring without repeating characters

DCheck if two strings share any common characters

Step-by-Step Solution

Solution:

Step 1: Analyze each problem
Options A, B, and D are variants of the same problem solvable by bitmasking. Find the longest substring without repeating characters requires substring analysis, not character set overlap.
Step 2: Identify anti-pattern
Longest substring without repeating characters requires sliding window, not bitmasking of entire words.
Final Answer:
Option B -> Option B
Quick Check:
Substring problems are not solved by bitmasking character sets [OK]

Quick Trick: Substring problems need sliding window, not bitmasking [OK]

Common Mistakes:

MISTAKES

Trap Explanation:

PITFALL

Candidates often think all character-related problems use bitmasking, missing substring-specific approaches.

Interviewer Note:

CONTEXT

Tests anti-pattern recognition and understanding problem suitability for bitmasking

Master "Maximum Product of Word Lengths" in Bit Manipulation

3 interactive learning modes - each teaches the same concept differently

Want More Practice?

15+ quiz questions · All difficulty levels · Free

More Bit Manipulation Quizzes