Completed pre-course 1

[abhayb94]

No description provided.

[super30admin]

The student's solution demonstrates a good understanding of basic data structures (Stack and LinkedList) and their implementations. Here's a detailed evaluation:

1. Correctness:

• Exercise_1 (Array-based Stack): The implementation is mostly correct but has a bug in isEmpty() method. Checking a.length == 0 is incorrect since the array is always initialized to size MAX. It should only check top == -1.
• Exercise_2 (Linked List-based Stack): Implementation is correct and handles edge cases well.
• Exercise_3 (Linked List): Implementation is correct but could be improved by making insert() non-static and operating on instance data.

2. Time Complexity:

• All operations are correctly analyzed with appropriate time complexities (O(1) for stack operations, O(n) for linked list insertion).

3. Space Complexity:

• Space complexity analysis is correct for all implementations.

4. Code Quality:

• Code is generally well-structured and readable.
• Good use of comments explaining time/space complexity.
• Could improve by adding more descriptive comments for method functionality.
• In Exercise_3, the insert() method being static is unconventional for OOP design.

5. Efficiency:

• Exercise_1: isEmpty() can be simplified to just return top == -1.
• Exercise_3: Could maintain a tail pointer to make insertions O(1) instead of O(n).
• Error messages could be more descriptive (e.g., include which operation caused underflow/overflow).