Dp2

[YogeshPardeshi]

No description provided.

[super30admin]

Paint House (Problem1.java)

Strengths:

1. Excellent use of dynamic programming, achieving O(n) time complexity vs the reference's O(2^n)
2. Clean, readable code with clear variable naming
3. Correctly handles the base case for the last row
4. Proper use of bottom-up DP approach

Areas for Improvement:

1. Space optimization: The solution uses O(n) space but could be reduced to O(1) by only keeping track of the next row's values, since we only need dp[i+1] when computing dp[i]
2. Consider adding comments to explain the DP recurrence relation for better maintainability

VERDICT: PASS

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Coin Change II (Problem2.java)

Strengths:

1. Correctly implements the classic unbounded knapsack / coin change DP formulation
2. Clean and readable code structure with proper variable naming
3. Handles all edge cases properly
4. Uses a systematic approach with clear logic flow

Areas for Improvement:

1. Space optimization: The 2D DP can be reduced to 1D since dp[i] only depends on dp[i-1] (same row) and dp[i] (current row, earlier column). This would reduce space from O(m*n) to O(n).
2. Could add comments explaining the DP recurrence relation for better readability
3. The outer loop starting from i=1 is correct, but could consider iterating coins first (outer) then amount (inner) which is the standard pattern for this problem

Code Quality Notes:

• The code is well-structured and follows Java conventions
• Variable names (m, n, i, j) are clear and standard for DP problems
• The if-else logic is clean and correctly implements the recurrence

VERDICT: PASS