Pre course1

[divyaseelam06]

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. Exercise_1.java (Array-based Stack):

   • Correctness: The implementation correctly handles stack operations (push, pop, peek, isEmpty, isFull). Edge cases like stack overflow and underflow are handled appropriately.
   • Time Complexity: Correctly noted as O(1) for all operations.
   • Space Complexity: Correctly noted as O(1) since the stack size is fixed.
   • Code Quality: The code is clean and readable. However, the isEmpty() and isFull() methods could be simplified to return top == 0; and return top == stackArray.length; respectively.
   • Efficiency: The implementation is efficient. No major optimizations needed.

2. Exercise_2.java (Linked List-based Stack):

   • Correctness: The stack operations are correctly implemented. The pop() method handles underflow, and push() updates the head correctly.
   • Time Complexity: Correctly noted as O(1) for all operations.
   • Space Complexity: Correctly noted as O(n) where n is the number of elements.
   • Code Quality: The code is well-structured. However, the peek() method should handle the case where the stack is empty (similar to pop()).
   • Efficiency: The implementation is efficient. No major optimizations needed.

3. Exercise_3.java (Singly Linked List):

   • Correctness: The insert and printList methods work as expected. However, the insert method could be simplified by directly assigning list.head = node when the list is empty, instead of node.next = list.head; list.head = node;.
   • Time Complexity: Correctly noted as O(n) for insert and printList.
   • Space Complexity: Correctly noted as O(n).
   • Code Quality: The code is readable but could benefit from better variable naming (e.g., last could be current). The printList method could be simplified by removing the redundant print statement outside the loop.
   • Efficiency: The implementation is efficient for a singly linked list.

General Feedback:

• The student has a good grasp of the concepts and has implemented the solutions correctly.
• The code is well-commented and follows a logical structure.
• Minor improvements in code readability and edge case handling (e.g., peek() in Exercise_2.java) would make the solutions even better.
• The student could consider adding more test cases to validate edge cases (e.g., inserting into an empty list, popping from an empty stack).