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Which of the following problems CANNOT be efficiently solved using bit manipulation techniques like n & (n - 1)?

easy🔍 Pattern Recognition Q2 of Q15
Bit Manipulation - Power of Two
Which of the following problems CANNOT be efficiently solved using bit manipulation techniques like n & (n - 1)?
ACheck if a number is a power of two
BFind the maximum subarray sum
CDetermine if a number is a power of four
DCount the number of set bits in an integer
Step-by-Step Solution
Solution:

  1. Step 1: Analyze each problem

    Power of two and counting set bits are classic bit manipulation tasks. Maximum subarray sum is a numeric algorithm but not bit manipulation.

  2. Step 2: Identify the anti-pattern

    Maximum subarray sum cannot be solved using bit manipulation techniques like n & (n - 1).

  3. Final Answer:

    Option B -> Option B

  4. Quick Check:

    Maximum subarray sum requires different algorithmic approaches [OK]
Quick Trick: Maximum subarray sum is not a bit manipulation problem [OK]
Common Mistakes:
MISTAKES
  • Assuming all power checks are same
  • Ignoring bit position constraints
Trap Explanation:
PITFALL
  • Candidates often think power of four is same as power of two, missing extra bit position checks.
Interviewer Note:
CONTEXT
  • Tests ability to distinguish similar but distinct bit manipulation problems.
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