Reverse a linked list.

Question

Rob · Accepted Answer

Node ReverseLinkedList(Node head)
{
    Node next = head.next;
    if (next == null)
    {
        return head;
    }

    Node revList = ReverseLinkedList(head.next);
    next.next = head;
    head.next = null;
    
    return revList;
}

IC2 · Answer

A recursive approach if anyone is interested. Only works for singly linked/non circular atm.
called like: reverse(head, null);

public static ListNode reverse(ListNode curr, ListNode prev) {
	if (curr == null) {
		return prev;
	} else {
		ListNode temp = curr.next;
		curr.next = prev;
		prev = curr;
		return reverse(temp, prev);
	}
}

Utilisateur anonyme · Answer

public static Node reverse(Node n)
{
  if(n != null) {
    Node reversed.data = n.data;
    while(n.next != null)
    {
      Node insert;
      insert.data = n.next;
      insert.next = reversed;
      reversed = insert;
      n = n.next;
    }
    return reversed;
  }
  return null;
}

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