Completed Exercise1,2,3 part of PreCourse1

[kkhevna9252]

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[super30admin]

1. Correctness:

   • Exercise_1.java: The stack implementation using an array is correct. It handles stack overflow and underflow conditions appropriately.
   • Exercise_2.java: The stack implementation using a linked list is correct. It properly manages push, pop, and peek operations with appropriate error handling.
   • Exercise_3.java: The linked list implementation is correct for insertion and printing operations.

2. Time Complexity:

   • Exercise_1.java: Correctly identified as O(1) for push, pop, and peek operations.
   • Exercise_2.java: Correctly identified as O(1) for push, pop, and peek operations.
   • Exercise_3.java: Correctly identified as O(n) for insertion and printing operations.

3. Space Complexity:

   • Exercise_1.java: Correctly identified as O(MAX) for the array size.
   • Exercise_2.java: Correctly identified as O(n) for the number of nodes.
   • Exercise_3.java: Correctly identified as O(n) for the number of nodes.

4. Code Quality:

   • The code is generally well-structured and readable.
   • Comments are present and helpful, though some methods could benefit from more detailed explanations.
   • The use of static methods in Exercise_3.java might be reconsidered for better object-oriented design.
   • Variable names are clear and appropriate.

5. Efficiency:

   • Exercise_1.java: Efficient use of an array for stack operations.
   • Exercise_2.java: Efficient use of a linked list for stack operations.
   • Exercise_3.java: The insertion method could be optimized by maintaining a tail pointer to avoid O(n) traversal for each insertion.

Areas for Improvement:

• Exercise_3.java: Consider adding a tail pointer to the LinkedList class to make insertions O(1) instead of O(n).
• Exercise_3.java: The static methods might be better as instance methods for better encapsulation.
• Exercise_1.java and Exercise_2.java: Consider adding more edge case tests in the main methods to ensure robustness.