done Linked-List-1

[sainathek1999]

No description provided.

[super30admin]

Strengths:

• The solutions are correct and efficient, with optimal time and space complexity.
• The code is clean, well-commented, and easy to read.
• The student uses appropriate variable names and follows good coding practices.
• The student handles edge cases effectively, such as using a dummy node in problem2.

Areas for Improvement:

• In problem3, the flag variable is not necessary. You can avoid it by checking after the while loop whether fast is null or fast.next is null (indicating no cycle) and then proceeding accordingly. This would make the code slightly more concise.
• For problem2, ensure that the fast pointer movement is safe. The code moves fast n+1 steps, but if n is the length of the list, this might cause issues? Actually, with the dummy node and moving n+1 steps, it is correct because the list has length L, and we are moving n+1 steps. Since n <= L, it is safe. However, note that the count loop runs n+1 times, so if n is 0, it would move fast one step? But n is at least 1 (as per the problem constraints? The problem says n is at least 1? Actually, the problem constraints for n are not specified in the snippet, but typically n is between 1 and the list length. So it's safe.
• In problem1, the comment says "reverse linking the nodes from the start-null and last node as head" which is a bit unclear. It might be better to say "Iterate through the list, reversing the links so that each node points to its previous node. Finally, return the new head (which was the last node)."

Overall, the student has done an excellent job. The solutions are correct and efficient.