completed precourse 1

[PurvaT-11]

No description provided.

[super30admin]

1. Correctness:

   • Exercise_1.py: The stack implementation is correct for basic operations (push, pop, peek, size, show). However, the isEmpty() method should ideally return a boolean (True/False) rather than relying on the truthiness of len() == 0.
   • Exercise_2.py: The stack implementation using linked list is mostly correct, but there's no isEmpty() method which would be useful. The pop() method correctly handles empty stack cases.
   • Exercise_3.py: The linked list implementation has several issues:
     • The append() method will fail if the list is empty (self.head is None) because it tries to access curr.next immediately.
     • The find() method returns None too early (inside the while loop) instead of after the loop completes.
     • The remove() method doesn't handle the case where the key is in the head node.

2. Time Complexity:

   • The student has correctly identified time complexities for most operations.
   • For Exercise_3.py, append() is O(n) as stated, but the implementation is incorrect as mentioned above.

3. Space Complexity:

   • The space complexity analysis is correct for all exercises (O(n) for storing elements).

4. Code Quality:

   • Good use of comments explaining the code.
   • Variable naming is clear and appropriate.
   • Missing docstrings for some methods (especially in Exercise_3.py).
   • Exercise_3.py needs better error handling for edge cases.

5. Efficiency:

   • Exercise_1.py could benefit from returning a boolean in isEmpty().
   • Exercise_2.py could include an isEmpty() method.
   • Exercise_3.py needs significant improvements in handling edge cases and correct implementation of methods.