Precourse-1 Done

[ManishaRana1195]

No description provided.

[super30admin]

1. Correctness:

   • Exercise_1.java: The stack implementation using an array is mostly correct. However, the pop() method has a minor issue where it sets a[top--] = 0 after already storing the value to return. This could lead to incorrect behavior if the array is accessed after popping. It should just decrement top without setting the value to 0.
   • Exercise_2.java: The linked list implementation of the stack is correct and handles edge cases well.
   • Exercise_3.java: The linked list insertion is correct but inefficient for large lists since it traverses the entire list for each insertion. A tail pointer could optimize this.

2. Time Complexity:

   • Exercise_1.java: Correctly stated as O(1) for push, pop, and peek.
   • Exercise_2.java: Correctly stated as O(1) for push and pop.
   • Exercise_3.java: Insertion is O(n) per operation due to traversal. This could be improved to O(1) with a tail pointer.

3. Space Complexity:

   • All implementations correctly state their space complexities. The array-based stack uses O(n) space, while the linked list implementations use O(1) additional space per operation.

4. Code Quality:

   • The code is generally well-structured and readable.
   • Comments are clear and helpful.
   • The use of static final for MAX in Exercise_1.java is good practice.
   • In Exercise_3.java, the insert method could be more efficient and the LinkedList class could benefit from instance methods rather than static ones.

5. Efficiency:

   • Exercise_1.java: The pop() method could be more efficient by not zeroing out the popped element.
   • Exercise_3.java: Maintaining a tail pointer would make insertions O(1) instead of O(n).