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Which operation is not supported by a doubly linked list?Insertion at the beginning of the list.Deletion from the middle of the list.Accessing elements randomly by index.Traversing from the end of the list to the beginning.

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Which operation is not supported by a doubly linked list?Insertion at the beginning of the list.Deletion from the middle of the list.Accessing elements randomly by index.Traversing from the end of the list to the beginning.

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Solution 1

Accessing elements randomly by index is not supported by a doubly linked list.

Here's why:

  1. Insertion at the beginning of the list: This operation is supported by a doubly linked list. You just need to adjust the head pointer and the previous pointer of the second node.

  2. Deletion from the middle of the list: This operation is also supported by a doubly linked list. You can traverse to the node to be deleted, adjust the next pointer of the node before it and the previous pointer of the node after it.

  3. Accessing elements randomly by index: This operation is not supported efficiently by a doubly linked list. To access an element at a particular index, you would need to traverse the list from the beginning or end, which takes O(n) time. This is less efficient compared to arrays or array lists, which can access elements at any index in constant O(1) time.

  4. Traversing from the end of the list to the beginning: This operation is supported by a doubly linked list. You can start from the tail and move to the previous nodes using the previous pointers.

This problem has been solved

Solution 2

Accessing elements randomly by index is not supported by a doubly linked list.

Here's why:

  1. Insertion at the beginning of the list: This operation is supported by a doubly linked list. You just need to adjust the head and the previous pointer of the next node.

  2. Deletion from the middle of the list: This operation is also supported by a doubly linked list. You need to adjust the next pointer of the node before the target node and the previous pointer of the node after the target node.

  3. Accessing elements randomly by index: This operation is not supported by a doubly linked list. In a doubly linked list, you don't have direct access to the elements by their index. You would have to traverse the list from the head node to the desired index, which takes linear time.

  4. Traversing from the end of the list to the beginning: This operation is supported by a doubly linked list. You can start from the tail and use the previous pointers to reach the head.

This problem has been solved

Solution 3

Accessing elements randomly by index is not supported by a doubly linked list.

Here's why:

  1. Insertion at the beginning of the list: This operation is supported by a doubly linked list. You just need to adjust the head pointer and the previous pointer of the second node.

  2. Deletion from the middle of the list: This operation is also supported by a doubly linked list. You can traverse to the node to be deleted, adjust the next pointer of the node before it and the previous pointer of the node after it.

  3. Accessing elements randomly by index: This operation is not supported efficiently by a doubly linked list. To access an element at a particular index, you would need to traverse the list from the beginning or end, which takes O(n) time. This is less efficient compared to arrays or array lists, which can access elements at any index in constant time, O(1).

  4. Traversing from the end of the list to the beginning: This operation is supported by a doubly linked list. You can start from the tail and move to the previous nodes using the previous pointers.

This problem has been solved

Solution 4

The operation that is not supported efficiently by a doubly linked list is "Accessing elements randomly by index".

Here's why:

  1. Insertion at the beginning of the list: This operation is supported by a doubly linked list. You just need to create a new node, set its next pointer to the current head, set the previous pointer of the current head to the new node, and then update the head to the new node. This operation is O(1), which means it takes constant time.

  2. Deletion from the middle of the list: This operation is also supported by a doubly linked list. You need to traverse to the node, update the next pointer of the node before it and the previous pointer of the node after it, and then delete the node. This operation is O(n), which means it takes linear time because you need to traverse to the node.

  3. Accessing elements randomly by index: This operation is not supported efficiently by a doubly linked list. To access an element by index, you need to traverse from the head node to the desired index, which takes O(n) time. This is less efficient compared to arrays or array lists, which support this operation in constant time, O(1).

  4. Traversing from the end of the list to the beginning: This operation is supported by a doubly linked list. You can start from the tail node and follow the previous pointers to the head node. This operation is O(n), which means it takes linear time because you need to traverse through the list.

This problem has been solved

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