Done DP-1

[bansariradadiya01]

No description provided.

[super30admin]

The Coin Change (CoinChange.java)

Strengths:

1. Correctly implements the classic 2D DP solution for coin change
2. Good variable naming (n, m, dp) and clear logic flow
3. Properly handles the impossible case by checking if result >= amount + 1
4. Includes a main method with a test case demonstrating the solution works

Areas for Improvement:

1. The solution uses O(n*m) space, but this can be optimized to O(m) using a 1D DP array since each row only depends on the current row and previous row
2. Could add comments explaining the DP logic for better readability
3. The code structure could be improved by adding proper braces for better maintainability
4. Consider handling the edge case where amount = 0 explicitly (though it works correctly as is)

Comparison to Reference:

• Student's solution (O(nm) time, O(nm) space) is significantly more efficient than the reference solution (O(2^(m+n)) time, O(m+n) space)
• The DP approach is the optimal solution for this problem

VERDICT: PASS

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House Robber (HouseRobber.java)

Strengths:

• Excellent use of dynamic programming to achieve O(n) time complexity
• Clean, readable code with proper structure
• Correct handling of edge cases
• Good comments explaining complexity

Areas for Improvement:

• Space optimization: Since only dp[i-1] and dp[i-2] are needed at each step, you could reduce space from O(n) to O(1) by using two variables instead of an array
• Consider adding input validation for null arrays or negative values (though constraints guarantee valid input)

VERDICT: PASS