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@thondaha thondaha commented Jan 3, 2026

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Strengths:

  • The student has demonstrated a deep understanding of dynamic programming by implementing multiple approaches for each problem.
  • The code is well-commented and organized, making it easy to follow the logic.
  • The test cases are comprehensive and verify the correctness of all implementations.

Areas for Improvement:

  • In the recursiveCoinChange method, the base case could be simplified by directly returning Integer.MAX_VALUE when amount < 0, rather than checking it in the recursiveHelper method.
  • The memoization in the top-down DP solutions could be initialized with -1 or another sentinel value to make it clearer when a value hasn't been computed yet.
  • The test cases could be expanded to include edge cases with larger inputs to better validate the performance of the DP solutions.

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