completed array-2

[yashhh-23]

No description provided.

[super30admin]

Find All Numbers Disappeared in an Array (findnumsdisappear.java)

Strengths:

• Clean, readable code with good variable names
• Correctly identifies the time and space complexity
• Efficient O(n) time complexity, significantly better than the brute force reference
• Good use of HashSet for O(1) lookup time
• Includes helpful comments explaining the approach

Areas for Improvement:

• Space complexity is O(n), but the follow-up challenge suggests achieving O(1) extra space
• Consider exploring an in-place solution that marks indices (e.g., for each number num, mark nums[num-1] as negative) to avoid the HashSet
• The solution could benefit from handling edge cases more explicitly in comments

VERDICT: PASS

---

max and min (gameoflife.java)

1. Problem Mismatch: The submitted solution addresses the "Game of Life" problem, not the "max and min" problem described in the reference solution. This suggests the student may have copied code from a different problem or misunderstood the assignment.

2. Correctness: Since the solution doesn't address the intended problem, it cannot be evaluated for correctness in the context of this assignment.

3. Code Quality: The Game of Life solution itself is well-structured with:

   • Clear comments explaining the approach
   • Good use of direction array for neighbor counting
   • Proper use of intermediate states (2 and 3) for in-place modification
   • Clean separation of logic with a helper method

4. Time/Space Complexity: For the Game of Life problem, the solution achieves O(m*n) time and O(1) space, which is optimal.

5. Recommendation: The student needs to submit a solution that actually solves the min/max problem as described. The correct approach would involve comparing pairs of elements to find both minimum and maximum in fewer than 2*(N-2) comparisons.

VERDICT: NEEDS_IMPROVEMENT

---

Game of Life

Strengths:

• The solution correctly implements the in-place algorithm using intermediate states (2 and 3), which is the optimal approach for this problem
• The neighbor counting logic correctly includes cells with state 2 (dying) but excludes cells with state 3 (becoming alive), which is essential for simultaneous updates
• The code is clean, well-commented, and follows good naming conventions
• Time and space complexity match the reference solution

Areas for Improvement:

• The solution is essentially identical to the reference solution, which is fine for correctness but could benefit from demonstrating independent problem-solving
• Consider adding more detailed comments explaining why intermediate states are used (to avoid overwriting values needed for other cell calculations)

Note: The student submitted an unrelated solution file (findnumsdisappear.java) which appears to be from a different problem. In the future, ensure only the relevant solution file is submitted.

VERDICT: PASS