What is the time complexity to delete a node in linked list?

Introduction to Singly Linked List

Singly Linked List is a variant of Linked List which allows only forward traversal of linked lists. This is a simple form, yet it is effective for several problems such as Big Integer calculations.

A singly linked list is made up of nodes where each node has two parts:

• The first part contains the actual data of the node
• The second part contains a link that points to the next node of the list that is the address of the next node.

The beginning of the node marked by a special pointer named START. The pointer points to the fist node of the list but the link part of the last node has no next node to point to.

The main difference from an array is:

• Elements are not stored in contiguous memory locations.
• Size of Linked List need not be known in advance. It can increase at runtime depending on number of elements dynamically without any overhead.

In Singly Linked List, only the pointer to the first node is stored. The other nodes are accessed one by one.

To get the address of ith node, we need to traverse all nodes before it because the address of ith node is stored with i-1th node and so on.

What is the space complexity for deleting a linked list O'n O 1 either O 1 or O N?

What is the space complexity for deleting a linked list O'n O 1 either O 1 or O N?

Discussion Forum

What is space complexity of linked list?

Space. Linked lists hold two main pieces of information (the value and pointer) per node. This means that the amount of data stored increases linearly with the number of nodes in the list. Therefore, the space complexity of the linked list is linear: Space - O(n) .

What's the time complexity of removing an element from a doubly-linked list?

The time complexity for removal is only O(1) for a doubly-linked list if you already have a reference to the node you want to remove. Removal for a singly-linked list is only O(1) if you already have references to the node you want to remove and the one before.

What is the the best case time complexity of deleting a node in a singly linked list?

What is the best case time complexity of deleting a node in a Singly Linked list? Explanation: Deletion of the head node in the linked list is taken as the best case. The successor of the head node is changed to head and deletes the predecessor of the newly assigned head node. This process completes in O(1) time.

What is the time complexity of removing the first element of a linked list?

If you want to delete a specific element, the time complexity is O(n) (where n is the number of elements) because you have to find the element first. If you want to delete an element at a specific index i , the time complexity is O(i) because you have to follow the links from the beginning.

What is the complexity of removing the minimum item from a sorted linked list?

2 Answers. It is O(n), because after removing the element, all other elements need to be moved 1 place to the left. If you would have a Linked List, this would not be necessary, so for this data structure it would be O(1).

Why are linked lists useful?

Linked lists are useful because they support the efficient insertion and removal of elements at the expense of inefficient element access, as opposed to arrays. When a variable is created, the computer must allocate memory.

What is the complexity of removing the maximum item from a sorted linked list?

The time complexity for removal is only O(1) for a doubly-linked list if you already have a reference to the node you want to remove. Removal for a singly-linked list is only O(1) if you already have references to the node you want to remove and the one before.

How to calculate time complexity of deletion in linked list?

1.If pointer is given in this case Time Complexity is O (1). 2.You DON'T have pointer to the node to be deleted (Search and Delete). In this case Time Complexity is O (n). I might be wrong, but for your first point, you would need a pointer to the node before the one you're deleting, not the one you're deleting. – MarkB Sep 29 at 8:16

What is the time complexity of insertion in linked list?

The time complexity of insertion is only O(1) if you already have a reference to the node you want to insert after. The time complexity for removal is only O(1) for a doubly-linked list if you already have a reference to the node you want to remove.

Which is more efficient filtering or deleting a linked list?

This means for example that filtering a linked list is more efficient than filtering a list based on an array. Your are correct. 1.If pointer is given in this case Time Complexity is O (1). 2.You DON'T have pointer to the node to be deleted (Search and Delete). In this case Time Complexity is O (n).

What happens at the end of a singly linked list?

Once you reach the end of the list, setNext of ‘temp’ to null, ‘cur’ is not being pointed to by any node, and hence it is available for garbage collection. 5. What is the functionality of the following code?

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Problem Statement

Given the linked list. The task is to delete the node of the linked list and return the list.

Examples:

Input: 4 -> 5 -> 1 -> 9
Key = 5
Output: 4 -> 1 -> 9 -> NULL
Explanation:

Input: 10 -> 20 -> 30 -> NULL
Key = 20
Output: 10 -> 30 -> NULL