What is the time and space complexity of linked lists?

What is the time and space complexity of linked lists?

The time complexity for accessing an element in a linked list is O(n), while insertion and deletion can be O(1) if you have a pointer to the node. The space complexity is O(n) due to the storage of nodes.

Can you explain why accessing is O(n)?

Sure! In a linked list, you must traverse from the head node to the desired node, which takes linear time, hence O(n).

What about the complexity of a doubly linked list?

A doubly linked list has similar time complexities: O(n) for access and O(1) for insertion/deletion if you have a pointer. The space complexity is also O(n) due to the extra pointers.

Are there any scenarios where linked lists are preferred over arrays?

Yes, linked lists are preferred when you need frequent insertions and deletions, as they can be done in constant time without resizing.