Adding all the solutions

[subbu4061]

No description provided.

[super30admin]

Strengths:

• You provided both iterative and recursive solutions as suggested by the problem, showing a good understanding of different approaches.
• The iterative solution is efficient with O(n) time and O(1) space, matching the optimal solution.
• The code is generally readable and well-structured.

Areas for Improvement:

• For the recursive solution, avoid using an instance variable (output) to store the new head. Instead, you can structure the recursion to return the new head. For example:

  public ListNode reverseList(ListNode head) {
      if (head == null || head.next == null) return head;
      ListNode newHead = reverseList(head.next);
      head.next.next = head;
      head.next = null;
      return newHead;
  }
  

  This avoids the need for a helper function and an instance variable, making the code cleaner and purely recursive.
• The submission includes solutions for other problems that are not related to reversing a linked list. When submitting a solution, ensure that you only include code relevant to the problem at hand to avoid confusion.
• For the recursive solution, be aware that for very large lists (close to 5000 nodes), the recursion depth might cause a stack overflow. The iterative solution is preferred for large inputs.