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Which of the following problems CANNOT be solved using the candy distribution greedy pattern (two-pass neighbor comparison)?

easy🔍 Pattern Recognition Q2 of Q15
Greedy Algorithms - Candy Distribution
Which of the following problems CANNOT be solved using the candy distribution greedy pattern (two-pass neighbor comparison)?
AAssigning candies so each child has more than neighbors with lower rating
BEnsuring children with equal ratings get equal candies
CFinding the longest increasing subsequence in an array
DMinimizing total candies while satisfying local neighbor constraints
Step-by-Step Solution
Solution:
  1. Step 1: Understand candy distribution constraints

    The pattern requires strictly greater candies for strictly higher ratings, but equal ratings can have equal candies.
  2. Step 2: Identify problem incompatible with pattern

    Ensuring equal candies for equal ratings is not guaranteed by the standard greedy approach and may require additional logic.
  3. Final Answer:

    Option B -> Option B
  4. Quick Check:

    Standard candy pattern does not enforce equal candies for equal ratings [OK]
Quick Trick: Candy pattern enforces strict inequalities, not equal candies [OK]
Common Mistakes:
MISTAKES
  • Assuming equal ratings always get equal candies
  • Confusing LIS with candy distribution
  • Thinking greedy solves all rating constraints
Trap Explanation:
PITFALL
  • Candidates confuse strict inequality constraints with equality constraints, which break the pattern.
Interviewer Note:
CONTEXT
  • Tests understanding of pattern limitations and anti-pattern recognition
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