PreCourse-1 Completed

[PrasiddhShah]

No description provided.

[super30admin]

The student has submitted solutions for three different exercises related to stack and linked list implementations. Here's a detailed evaluation:

1. Correctness:

   • Exercise_1 (Array-based Stack): The implementation appears correct with proper handling of stack overflow/underflow conditions. The isEmpty() method could be simplified to just check if top == -1.
   • Exercise_2 (Linked List-based Stack): The implementation is correct with proper push/pop operations. The isEmpty() check is correctly implemented.
   • Exercise_3 (Linked List): The implementation is mostly correct but has a bug in printList() where it doesn't print the last node's data.

2. Time Complexity:

   • All operations (push, pop, peek, isEmpty) are correctly identified as O(1) for both stack implementations.
   • The linked list insert operation is O(n) which is correctly identified.

3. Space Complexity:

   • Correctly identified as O(n) for all implementations.

4. Code Quality:

   • Good use of comments explaining time/space complexity.
   • Some methods could be more concise (e.g., isEmpty() in Exercise_1).
   • The printList() method in Exercise_3 needs to be fixed to print all nodes.
   • Consistent indentation and formatting throughout.

5. Efficiency:

   • The array-based stack could be made more memory efficient by shrinking the array when it becomes significantly empty.
   • The linked list print method should be optimized to print all nodes.

Areas for Improvement:

• Fix the printList() method in Exercise_3 to print all nodes.
• Simplify isEmpty() method in Exercise_1.
• Consider adding more edge case testing (e.g., empty stack operations).
• Add null checks where appropriate in linked list operations.