Completed PreCourse1

[vaishnavi2231]

No description provided.

[super30admin]

The student's solution demonstrates a good understanding of basic data structures like stacks and linked lists. Here's a detailed evaluation:

1. Correctness:

• Exercise_1 (Array-based Stack): The implementation appears correct with proper handling of empty stack cases.
• Exercise_2 (Linked List-based Stack): Correct implementation with proper push/pop operations.
• Exercise_3 (Singly Linked List): Mostly correct but has some issues:
  • The find() method doesn't handle the case where the key isn't found (will raise AttributeError).
  • The remove() method doesn't handle empty list cases or cases where the key isn't found.

2. Time Complexity:

• All time complexity analyses are correct for each operation.
• For Exercise_3, the student correctly identifies O(n) time for linked list operations.

3. Space Complexity:

• Space complexity analyses are accurate for all implementations.

4. Code Quality:

• Good use of comments and docstrings.
• Variable naming is clear and appropriate.
• The code is well-structured and readable.
• Some improvements could be made:
  • In Exercise_3, error handling for edge cases is missing.
  • The show() method in Exercise_3 has an incorrect docstring (copied from remove()).

5. Efficiency:

• The implementations are generally efficient for their respective data structures.
• For Exercise_3, consider adding a tail pointer to make append operations O(1) instead of O(n).

Additional suggestions:

• Add input validation in Exercise_2's interactive part.
• Consider adding str or repr methods instead of show() methods.
• Add more test cases to cover edge cases (empty lists, missing keys, etc.).