Middle
How will a linked list (LinkedList) and an array list (ArrayList) behave if an element is inserted into them?
sobes.tech AI
Answer from AI
Inserting an element into a LinkedList requires traversing the list to the desired position, which takes O(n) in the worst case. The insertion itself is O(1), as it only requires updating two pointers (the current and previous elements).
Inserting an element into an ArrayList in the middle requires shifting all subsequent elements one position to the right, which takes O(n). Inserting at the end of the list is close to O(1) on average if there is free space. If the array is full, it is resized and elements are copied (amortized O(1)).
| Operation | LinkedList | ArrayList |
|---|---|---|
| Insertion at beginning | O(1) | O(n) |
| Insertion in middle | O(n) | O(n) |
| Insertion at end | O(1) | O(1) (amortized) |