Precourse 1 completed

[shreyargh]

No description provided.

[super30admin]

Overall, the student has demonstrated a good understanding of stack and linked list implementations. Here's a detailed evaluation for each file:

1. Exercise_1.java (Array-based Stack):

• Correctness: The implementation is mostly correct but has a bug in isEmpty() method. It checks a.length which is always MAX (1000), not the actual number of elements. Should check top == -1 instead.
• Time Complexity: Correctly identified as O(1) for all operations.
• Space Complexity: Correctly identified as O(n).
• Code Quality: Well-structured and readable. Good use of comments.
• Improvement: Fix isEmpty() method and consider returning Integer.MIN_VALUE instead of 0 for empty stack cases to distinguish from valid 0 values.

2. LinkedList.java:

• Correctness: Implementation is correct for singly linked list operations.
• Time Complexity: Correctly identified as O(n) for insertion at end.
• Space Complexity: Correctly identified as O(n).
• Code Quality: Good structure and readability. The static insert method is unconventional but works.
• Improvement: Consider making insert() non-static for better object-oriented design.

3. StackAsLinkedList.java:

• Correctness: Implementation is correct for stack operations using linked list.
• Time Complexity: Correctly identified as O(1) for all operations.
• Space Complexity: Correctly identified as O(n).
• Code Quality: Excellent structure and readability. Good use of inner class.
• Improvement: Consider returning Integer.MIN_VALUE instead of 0 for empty stack cases.

General strengths:

• Good code organization and structure
• Appropriate use of comments
• Correct time/space complexity analysis
• Handles edge cases like empty stacks/lists

Areas for improvement:

• Fix the isEmpty() bug in Exercise_1.java
• Consider more distinctive return values for empty cases
• Make LinkedList operations more object-oriented
• Add more test cases to verify edge conditions