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Which of the following problems CANNOT be efficiently solved using subsets generated by bitmask enumeration?

easy🔍 Pattern Recognition Q2 of Q15
Bit Manipulation - Subsets Using Bitmask
Which of the following problems CANNOT be efficiently solved using subsets generated by bitmask enumeration?
AFind the shortest path in a weighted graph
BFind all combinations of characters in a string
CEnumerate all subsets of a small integer array
DGenerate all subsets of a set of unique integers
Step-by-Step Solution
Solution:

  1. Step 1: Analyze problem types

    Generating subsets or combinations fits bitmask enumeration well; shortest path problems require graph algorithms.

  2. Step 2: Identify which problem is unsuitable

    Shortest path in weighted graph is a graph traversal problem, not subset enumeration.

  3. Final Answer:

    Option A -> Option A

  4. Quick Check:

    Shortest path problems require BFS/Dijkstra, not bitmask subsets [OK]
Quick Trick: Bitmask suits subset enumeration, not graph traversal [OK]
Common Mistakes:
MISTAKES
  • Assuming all combinatorial problems fit bitmask
  • Confusing graph problems with subset enumeration
Trap Explanation:
PITFALL
  • Candidates often think bitmask can solve all combinatorial problems, missing graph-specific algorithms.
Interviewer Note:
CONTEXT
  • Checks candidate's ability to distinguish problem domains and anti-patterns.
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