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  1. Prepare
  2. Data Structures
  3. Linked Lists
  4. Reverse a doubly linked list
  5. Discussions

Reverse a doubly linked list

  • sroy1532
     + 0 comments

    I guess you were getting a error because you were not setting the prev pointer to null if the head.next == null..

    For example, try this (passes all test cases): 

    Node Reverse(Node head) {
    if (head == null) {
        return head;
    }

    if (head.next == null) {
        head.prev = null;
        return head;
    }

    Node newHead = Reverse(head.next);
    head.next.next = head;
    head.prev = head.next;
    head.next = null;

    return newHead;
}