completed precourse-1

[sristi-i]

No description provided.

[super30admin]

1. Correctness:

   • Exercise_1.java: The stack implementation using an array appears correct, with proper handling of overflow and underflow conditions.
   • LinkedList.java: The linked list implementation correctly handles insertion at the end and printing. However, the isEmpty() check in printList could be more efficient by checking head == null instead of size == 0.
   • StackAsLinkedList.java: The stack implementation using linked list has a logical error in pop() where it doesn't handle the case when there's only one element in the stack (root == top). This would cause a NullPointerException.

2. Time Complexity:

   • Exercise_1.java: Correctly stated as O(1) for all operations.
   • LinkedList.java: Correctly stated as O(1) for insert (though technically O(n) for insert at end) and O(n) for print.
   • StackAsLinkedList.java: Incorrectly stated as O(n) for pop - should be O(1) if implemented correctly with a singly linked list where we maintain a pointer to the top.

3. Space Complexity:

   • All implementations correctly state O(n) space complexity.

4. Code Quality:

   • Generally good structure and readability.
   • Some redundant comments could be removed (like empty method comments).
   • Inconsistent use of this keyword (used in some places but not others).
   • Missing JavaDoc comments for methods.

5. Efficiency:

   • Exercise_1.java: Good implementation.
   • LinkedList.java: Could optimize isEmpty checks to use head == null instead of checking size.
   • StackAsLinkedList.java: The pop operation is inefficient (O(n)) due to traversal. Could be optimized to O(1) by making it a proper stack implementation where we push and pop from the head.