completed arrays 2

[anrg-ydv]

No description provided.

[super30admin]

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

Excellent work! Your solution demonstrates a strong grasp of in-place algorithms and optimal space-time tradeoffs. The "TEMPORARY STAGE CHANGE PATTERN" is the ideal approach for this problem, satisfying the follow-up requirement of O(n) time and O(1) extra space. A few minor suggestions:

1. Consider using List<Integer> as the declared type instead of ArrayList<Integer> to follow the "program to an interface" principle.
2. The restoration of original values in the second loop is a nice touch if the caller expects the array to remain unchanged—good defensive thinking.
3. Your comments are clear and helpful, making the code easy to understand.

VERDICT: PASS

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max and min (MinAndMax.java)

Strengths:

1. Correct implementation of the pair comparison algorithm.
2. Good handling of the odd-length edge case.
3. Clean, readable code with helpful comments.
4. Proper time and space complexity.

Areas for Improvement:

1. Consider using int[] for the return type to match the reference signature and avoid boxing overhead (though this is minor).
2. The initial values Integer.MAX_VALUE and Integer.MIN_VALUE for even-length case could be replaced with the first pair's values after comparison, which would be slightly more efficient (though the current approach is also correct).
3. Adding a brief explanation of why this approach uses fewer comparisons would strengthen the comments.

VERDICT: PASS

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Game of Life (GameOfLife.java)

Strengths:

1. Correct implementation with proper state encoding for in-place updates.
2. Clean separation of concerns with the countLiveNeighbor helper method.
3. Good comments explaining the approach and complexity.
4. Proper handling of edge cases (null check, boundary conditions).

Areas for improvement:

1. Variable naming clarity: The names lives = 2 and died = 3 are misleading. Consider renaming to something like wasDeadNowAlive = 2 and wasAliveNowDead = 3, or use inline comments to clarify what these values represent.
2. Magic numbers: Using raw values 2 and 3 throughout the code without explanation can be confusing. Consider using named constants or adding comments where these values are used.
3. The m and n as last indices: While clever, using m = board.length - 1 makes the code less readable. The reference solution's approach of using m = board.length and checking r<m is more conventional and easier to understand.
4. Minor: The if (board[i][j] == lives) followed by if (board[i][j] == died) could be else if for slight efficiency, though this is negligible.

VERDICT: PASS