DP-3 solution

[Simranb10]

No description provided.

[super30admin]

Minimum Falling Path Sum (MinFallingPath.java)

E bottom of the prompt.

VERDICT: NEEDS_IMPROVEMENT

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Delete and Earn (DeleteAndEarn.java)

Your solution is excellent! Here are some observations:

Strengths:

1. Correct approach: You correctly transformed the problem into a House Robber-like DP problem by creating a frequency-sum array.
2. Space optimization: Great job optimizing the space complexity by using only two variables (prev and curr) instead of a full DP array. This is an improvement over the reference solution.
3. Clean code: Your code is well-structured, readable, and includes helpful comments about complexity.
4. Correct time complexity: O(n + m) matches the optimal solution.

Areas for improvement:

1. Edge case handling: Consider what happens if nums is empty (though constraints say length >= 1). Adding a guard clause could make the code more robust.
2. Variable naming: arr could be renamed to something more descriptive like points to better convey its purpose.
3. The curr = arr[1] initialization: This assumes the array has at least 2 elements. While this is guaranteed by the constraints, it's worth being aware of.

Overall, this is a solid solution that demonstrates a good understanding of the problem and dynamic programming optimization techniques.

VERDICT: PASS