Done Competitive-Coding-2

[samikshm]

No description provided.

[super30admin]

The student has provided solutions for two problems. Let's evaluate each:

Problem 1 (Two Sum):

• The solution correctly implements the classic HashMap approach with O(n) time complexity
• Code is clean and well-structured with clear comments
• Edge case handling is appropriate (returns empty array when no solution found)
• One minor improvement: could use int[] result = new int[2]; with explicit indexing for slightly better performance, but current approach is fine

Problem 2 (0/1 Knapsack):

• Correctly implements the standard DP approach with O(nW) time and O(nW) space
• Code structure is clear with proper initialization (dp[0][w] = 0 implicitly)
• The nested loop logic is sound
• Could potentially be optimized to O(W) space using 1D DP array, but current 2D approach is correct and easier to understand

General Observations:

• Both solutions include helpful comments explaining time/space complexity
• Code follows good practices: meaningful variable names, proper indentation
• The approach descriptions are concise (three sentences as requested)
• Both solutions appear to be standard textbook approaches that are correct and efficient for their respective problems

Minor suggestions:

• Problem 1: Consider adding null/empty input validation for robustness
• Problem 2: Could add early return for edge cases (W <= 0 or n == 0)