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Which of the following is a correct method to reverse a doubly linked list?Swap the next and prev pointers of all nodes.Replace all nodes with their corresponding mirror nodes.Swap the data of all nodes.Create a new list and copy nodes in reverse order.

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Which of the following is a correct method to reverse a doubly linked list?Swap the next and prev pointers of all nodes.Replace all nodes with their corresponding mirror nodes.Swap the data of all nodes.Create a new list and copy nodes in reverse order.

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Solution 1

The correct method to reverse a doubly linked list is to swap the next and prev pointers of all nodes.

Here is a step-by-step guide on how to do it:

  1. Initialize three pointers, current, next, and prev. Set current to the head of the doubly linked list and prev to null.

  2. Loop through the list until current is null. In each iteration, perform the following steps:

    a. Set next to the next node of current.

    b. Set the next node of current to prev. This is where the actual reversing happens.

    c. Set the prev node of current to next. This step is necessary to maintain the doubly linked list structure after reversing.

    d. Move prev and current one step forward. Set prev to current and current to next.

  3. Once the loop is over, set the head of the list to prev because current is now null.

This method effectively reverses the doubly linked list by swapping the next and prev pointers of all nodes.

This problem has been solved

Solution 2

The correct method to reverse a doubly linked list is to swap the next and prev pointers of all nodes. Here's a step-by-step guide on how to do it:

  1. Initialize three pointers, current, next, and prev.
  2. Set current to the head of the doubly linked list.
  3. Loop through the list until current is NULL.
    • Inside the loop, set next to the next node of current.
    • Then, swap the next and prev pointers of current.
    • Move prev and current one step forward. Set prev to current and current to next.
  4. Once the loop is over, set the head of the list to prev as it will be the new head of the reversed list.

This method works because it iteratively swaps the next and prev pointers of each node, effectively reversing the direction of the list. The other methods mentioned in the question are not correct ways to reverse a doubly linked list.

This problem has been solved

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