Completed PreCourse-1

[Athulyagr20]

No description provided.

[super30admin]

The student has submitted three exercises implementing stack and linked list data structures in Java. Here's my evaluation:

Exercise_1 (Array-based Stack):

• Correctness: The implementation is mostly correct with proper overflow/underflow checks
• Issue: The push method doesn't update root (which doesn't exist in this class - should be top)
• Time Complexity: O(1) ✓
• Space Complexity: O(1) ✓

Exercise_2 (Linked List-based Stack):

• Correctness: Has a critical bug - the push method creates a new node but never updates root to point to it. The new node is orphaned.
• Time Complexity: O(1) ✓
• Space Complexity: O(1) ✓
• Issue: Missing root = newNode; in the push method

Exercise_3 (Singly Linked List):

• Correctness: Correct implementation of linked list insertion and traversal
• Time Complexity: O(n) for insertion (traversing to end) ✓
• Space Complexity: O(n) for storing n nodes ✓
• Good practice: Used static inner class appropriately

General Observations:

• Good use of comments explaining time/space complexity
• Proper handling of edge cases (empty stack checks)
• Code is readable and well-structured
• Exercise_2 has a functional bug that would cause push operations to fail silently