# Delete a Doubly Linked List node at a given position

Given a doubly linked list and a position **n**. The task is to delete the node at the given position **n** from the beginning.

Initial doubly linked list

Doubly Linked List after deletion of node at position **n** = 2

**Approach:** Following are the steps:

- Get the pointer to the node at position
**n**by traversing the doubly linked list up to the**nth**node from the beginning. - Delete the node using the pointer obtained in Step 1. Refer this post.

## C++

`/* C++ implementation to delete a doubly Linked List node` ` ` `at the given position */` `#include <bits/stdc++.h>` `using` `namespace` `std;` `/* a node of the doubly linked list */` `struct` `Node {` ` ` `int` `data;` ` ` `struct` `Node* next;` ` ` `struct` `Node* prev;` `};` `/* Function to delete a node in a Doubly Linked List.` ` ` `head_ref --> pointer to head node pointer.` ` ` `del --> pointer to node to be deleted. */` `void` `deleteNode(` `struct` `Node** head_ref, ` `struct` `Node* del)` `{` ` ` `/* base case */` ` ` `if` `(*head_ref == NULL || del == NULL)` ` ` `return` `;` ` ` `/* If node to be deleted is head node */` ` ` `if` `(*head_ref == del)` ` ` `*head_ref = del->next;` ` ` `/* Change next only if node to be deleted is NOT` ` ` `the last node */` ` ` `if` `(del->next != NULL)` ` ` `del->next->prev = del->prev;` ` ` `/* Change prev only if node to be deleted is NOT` ` ` `the first node */` ` ` `if` `(del->prev != NULL)` ` ` `del->prev->next = del->next;` ` ` `/* Finally, free the memory occupied by del*/` ` ` `free` `(del);` `}` `/* Function to delete the node at the given position` ` ` `in the doubly linked list */` `void` `deleteNodeAtGivenPos(` `struct` `Node** head_ref, ` `int` `n)` `{` ` ` `/* if list in NULL or invalid position is given */` ` ` `if` `(*head_ref == NULL || n <= 0)` ` ` `return` `;` ` ` `struct` `Node* current = *head_ref;` ` ` `int` `i;` ` ` `/* traverse up to the node at position 'n' from` ` ` `the beginning */` ` ` `for` `(` `int` `i = 1; current != NULL && i < n; i++)` ` ` `current = current->next;` ` ` `/* if 'n' is greater than the number of nodes` ` ` `in the doubly linked list */` ` ` `if` `(current == NULL)` ` ` `return` `;` ` ` `/* delete the node pointed to by 'current' */` ` ` `deleteNode(head_ref, current);` `}` `/* Function to insert a node at the beginning` ` ` `of the Doubly Linked List */` `void` `push(` `struct` `Node** head_ref, ` `int` `new_data)` `{` ` ` `/* allocate node */` ` ` `struct` `Node* new_node =` ` ` `(` `struct` `Node*)` `malloc` `(` `sizeof` `(` `struct` `Node));` ` ` `/* put in the data */` ` ` `new_node->data = new_data;` ` ` `/* since we are adding at the beginning,` ` ` `prev is always NULL */` ` ` `new_node->prev = NULL;` ` ` `/* link the old list off the new node */` ` ` `new_node->next = (*head_ref);` ` ` `/* change prev of head node to new node */` ` ` `if` `((*head_ref) != NULL)` ` ` `(*head_ref)->prev = new_node;` ` ` `/* move the head to point to the new node */` ` ` `(*head_ref) = new_node;` `}` `/* Function to print nodes in a given doubly` ` ` `linked list */` `void` `printList(` `struct` `Node* head)` `{` ` ` `while` `(head != NULL) {` ` ` `cout << head->data << ` `" "` `;` ` ` `head = head->next;` ` ` `}` `}` `/* Driver program to test above functions*/` `int` `main()` `{` ` ` `/* Start with the empty list */` ` ` `struct` `Node* head = NULL;` ` ` `/* Create the doubly linked list 10<->8<->4<->2<->5 */` ` ` `push(&head, 5);` ` ` `push(&head, 2);` ` ` `push(&head, 4);` ` ` `push(&head, 8);` ` ` `push(&head, 10);` ` ` `cout << ` `"Doubly linked list before deletion:n"` `;` ` ` `printList(head);` ` ` `int` `n = 2;` ` ` `/* delete node at the given position 'n' */` ` ` `deleteNodeAtGivenPos(&head, n);` ` ` `cout << ` `"\nDoubly linked list after deletion:n"` `;` ` ` `printList(head);` ` ` `return` `0;` `}` |

## Java

`/* Java implementation to delete a` ` ` `doubly Linked List node` ` ` `at the given position */` ` ` `// A node of the doubly linked list` `class` `Node` `{` ` ` `int` `data;` ` ` `Node next, prev;` `}` `class` `GFG` `{` ` ` `static` `Node head = ` `null` `;` ` ` `// Function to delete a node` ` ` `// in a Doubly Linked List.` ` ` `// head_ref --> pointer to head node pointer.` ` ` `// del --> pointer to node to be deleted.` ` ` `static` `Node deleteNode(Node del)` ` ` `{` ` ` `// base case` ` ` `if` `(head == ` `null` `|| del == ` `null` `)` ` ` `return` `null` `;` ` ` `// If node to be deleted is head node` ` ` `if` `(head == del)` ` ` `head = del.next;` ` ` `// Change next only if node to be` ` ` `// deleted is NOT the last node` ` ` `if` `(del.next != ` `null` `)` ` ` `del.next.prev = del.prev;` ` ` `// Change prev only if node to be` ` ` `// deleted is NOT the first node` ` ` `if` `(del.prev != ` `null` `)` ` ` `del.prev.next = del.next;` ` ` `del = ` `null` `;` ` ` `return` `head;` ` ` `}` ` ` `// Function to delete the node at the` ` ` `// given position in the doubly linked list` ` ` `static` `void` `deleteNodeAtGivenPos(` `int` `n)` ` ` `{` ` ` `/* if list in NULL or` ` ` `invalid position is given */` ` ` `if` `(head == ` `null` `|| n <= ` `0` `)` ` ` `return` `;` ` ` `Node current = head;` ` ` `int` `i;` ` ` `/*` ` ` `* traverse up to the node at` ` ` `position 'n' from the beginning` ` ` `*/` ` ` `for` `(i = ` `1` `; current != ` `null` `&& i < n; i++)` ` ` `{` ` ` `current = current.next;` ` ` `}` ` ` ` ` `// if 'n' is greater than the number of nodes` ` ` `// in the doubly linked list` ` ` `if` `(current == ` `null` `)` ` ` `return` `;` ` ` `// delete the node pointed to by 'current'` ` ` `deleteNode(current);` ` ` `}` ` ` `// Function to insert a node` ` ` `// at the beginning of the Doubly Linked List` ` ` `static` `void` `push(` `int` `new_data)` ` ` `{` ` ` `// allocate node` ` ` `Node new_node = ` `new` `Node();` ` ` `// put in the data` ` ` `new_node.data = new_data;` ` ` `// since we are adding at the beginning,` ` ` `// prev is always NULL` ` ` `new_node.prev = ` `null` `;` ` ` `// link the old list off the new node` ` ` `new_node.next = head;` ` ` `// change prev of head node to new node` ` ` `if` `(head != ` `null` `)` ` ` `head.prev = new_node;` ` ` `// move the head to point to the new node` ` ` `head = new_node;` ` ` `}` ` ` `// Function to print nodes in a` ` ` `// given doubly linked list` ` ` `static` `void` `printList()` ` ` `{` ` ` `Node temp = head;` ` ` `if` `(temp == ` `null` `)` ` ` `System.out.print(` `"Doubly Linked list empty"` `);` ` ` `while` `(temp != ` `null` `)` ` ` `{` ` ` `System.out.print(temp.data + ` `" "` `);` ` ` `temp = temp.next;` ` ` `}` ` ` `System.out.println();` ` ` `}` ` ` `// Driver code` ` ` `public` `static` `void` `main(String[] args)` ` ` `{` ` ` `// Create the doubly linked list:` ` ` `// 10<->8<->4<->2<->5` ` ` `push(` `5` `);` ` ` `push(` `2` `);` ` ` `push(` `4` `);` ` ` `push(` `8` `);` ` ` `push(` `10` `);` ` ` `System.out.println(` `"Doubly linked "` ` ` `+` `"list before deletion:"` `);` ` ` `printList();` ` ` `int` `n = ` `2` `;` ` ` ` ` `// delete node at the given position 'n'` ` ` `deleteNodeAtGivenPos(n);` ` ` `System.out.println(` `"Doubly linked "` ` ` `+` `"list after deletion:"` `);` ` ` `printList();` ` ` `}` `}` `// Thia code is contributed by Vivekkumar Singh` |

## Python

`# Python implementation to delete` `# a doubly Linked List node` `# at the given position` `# A node of the doubly linked list` `class` `Node:` ` ` ` ` `# Constructor to create a new node` ` ` `def` `__init__(` `self` `, data):` ` ` `self` `.data ` `=` `data` ` ` `self` `.` `next` `=` `None` ` ` `self` `.prev ` `=` `None` `# Function to delete a node in a Doubly Linked List.` `# head_ref -. pointer to head node pointer.` `# del -. pointer to node to be deleted.` `def` `deleteNode(head_ref, del_):` ` ` `# base case` ` ` `if` `(head_ref ` `=` `=` `None` `or` `del_ ` `=` `=` `None` `):` ` ` `return` ` ` `# If node to be deleted is head node` ` ` `if` `(head_ref ` `=` `=` `del_):` ` ` `head_ref ` `=` `del_.` `next` ` ` `# Change next only if node to be deleted is NOT` ` ` `# the last node` ` ` `if` `(del_.` `next` `!` `=` `None` `):` ` ` `del_.` `next` `.prev ` `=` `del_.prev` ` ` `# Change prev only if node to be deleted is NOT` ` ` `# the first node` ` ` `if` `(del_.prev !` `=` `None` `):` ` ` `del_.prev.` `next` `=` `del_.` `next` ` ` ` ` `return` `head_ref` `# Function to delete the node at the given position` `# in the doubly linked list` `def` `deleteNodeAtGivenPos(head_ref,n):` ` ` `# if list in None or invalid position is given` ` ` `if` `(head_ref ` `=` `=` `None` `or` `n <` `=` `0` `):` ` ` `return` ` ` `current ` `=` `head_ref` ` ` `i ` `=` `1` ` ` `# traverse up to the node at position 'n' from` ` ` `# the beginning` ` ` `while` `( current !` `=` `None` `and` `i < n ):` ` ` `current ` `=` `current.` `next` ` ` `i ` `=` `i ` `+` `1` ` ` `# if 'n' is greater than the number of nodes` ` ` `# in the doubly linked list` ` ` `if` `(current ` `=` `=` `None` `):` ` ` `return` ` ` `# delete the node pointed to by 'current'` ` ` `deleteNode(head_ref, current)` ` ` ` ` `return` `head_ref` `# Function to insert a node at the beginning` `# of the Doubly Linked List` `def` `push(head_ref, new_data):` ` ` `# allocate node` ` ` `new_node ` `=` `Node(` `0` `)` ` ` `# put in the data` ` ` `new_node.data ` `=` `new_data` ` ` `# since we are adding at the beginning,` ` ` `#prev is always None` ` ` `new_node.prev ` `=` `None` ` ` `# link the old list off the new node` ` ` `new_node.` `next` `=` `(head_ref)` ` ` `# change prev of head node to new node` ` ` `if` `((head_ref) !` `=` `None` `):` ` ` `(head_ref).prev ` `=` `new_node` ` ` `# move the head to point to the new node` ` ` `(head_ref) ` `=` `new_node` ` ` ` ` `return` `head_ref` `# Function to print nodes in a given doubly` `# linked list` `def` `printList(head):` ` ` `while` `(head !` `=` `None` `) :` ` ` `print` `( head.data ,end` `=` `" "` `)` ` ` `head ` `=` `head.` `next` ` ` `# Driver program to test above functions` `# Start with the empty list` `head ` `=` `None` `# Create the doubly linked list 10<.8<.4<.2<.5` `head ` `=` `push(head, ` `5` `)` `head ` `=` `push(head, ` `2` `)` `head ` `=` `push(head, ` `4` `)` `head ` `=` `push(head, ` `8` `)` `head ` `=` `push(head, ` `10` `)` `print` `(` `"Doubly linked list before deletion:"` `)` `printList(head)` `n ` `=` `2` `# delete node at the given position 'n'` `head ` `=` `deleteNodeAtGivenPos(head, n)` `print` `(` `"\nDoubly linked list after deletion:"` `)` `printList(head)` `# This code is contributed by Arnab Kundu` |

## C#

`/* C# implementation to delete a doubly Linked List node` `at the given position */` `using` `System;` `// A node of the doubly linked list` `public` `class` `Node` `{` ` ` `public` `int` `data;` ` ` `public` `Node next, prev;` `}` `class` `GFG` `{` ` ` `// Function to delete a node in a Doubly Linked List.` ` ` `// head_ref --> pointer to head node pointer.` ` ` `// del --> pointer to node to be deleted.` ` ` `static` `Node deleteNode(Node head, Node del)` ` ` `{` ` ` `// base case` ` ` `if` `(head == ` `null` `|| del == ` `null` `)` ` ` `return` `null` `;` ` ` `// If node to be deleted is head node` ` ` `if` `(head == del)` ` ` `head = del.next;` ` ` `// Change next only if node to be` ` ` `// deleted is NOT the last node` ` ` `if` `(del.next != ` `null` `)` ` ` `del.next.prev = del.prev;` ` ` `// Change prev only if node to be` ` ` `// deleted is NOT the first node` ` ` `if` `(del.prev != ` `null` `)` ` ` `del.prev.next = del.next;` ` ` `del = ` `null` `;` ` ` `return` `head;` ` ` `}` ` ` `// Function to delete the node at the` ` ` `// given position in the doubly linked list` ` ` `static` `void` `deleteNodeAtGivenPos(Node head, ` `int` `n)` ` ` `{` ` ` `/* if list in NULL or invalid position is given */` ` ` `if` `(head == ` `null` `|| n <= 0)` ` ` `return` `;` ` ` `Node current = head;` ` ` `int` `i;` ` ` `/*` ` ` `* traverse up to the node at position 'n' from the beginning` ` ` `*/` ` ` `for` `(i = 1; current != ` `null` `&& i < n; i++)` ` ` `{` ` ` `current = current.next;` ` ` `}` ` ` ` ` `// if 'n' is greater than the number of nodes` ` ` `// in the doubly linked list` ` ` `if` `(current == ` `null` `)` ` ` `return` `;` ` ` `// delete the node pointed to by 'current'` ` ` `deleteNode(head, current);` ` ` `}` ` ` `// Function to insert a node` ` ` `// at the beginning of the Doubly Linked List` ` ` `static` `Node push(Node head, ` `int` `new_data)` ` ` `{` ` ` `// allocate node` ` ` `Node new_node = ` `new` `Node();` ` ` `// put in the data` ` ` `new_node.data = new_data;` ` ` `// since we are adding at the beginning,` ` ` `// prev is always NULL` ` ` `new_node.prev = ` `null` `;` ` ` `// link the old list off the new node` ` ` `new_node.next = head;` ` ` `// change prev of head node to new node` ` ` `if` `(head != ` `null` `)` ` ` `head.prev = new_node;` ` ` `// move the head to point to the new node` ` ` `head = new_node;` ` ` `return` `head;` ` ` `}` ` ` `// Function to print nodes in a` ` ` `// given doubly linked list` ` ` `static` `void` `printList(Node temp)` ` ` `{` ` ` `if` `(temp == ` `null` `)` ` ` `Console.Write(` `"Doubly Linked list empty"` `);` ` ` `while` `(temp != ` `null` `)` ` ` `{` ` ` `Console.Write(temp.data + ` `" "` `);` ` ` `temp = temp.next;` ` ` `}` ` ` `Console.WriteLine();` ` ` `}` ` ` `// Driver code` ` ` `public` `static` `void` `Main(String []args)` ` ` `{` ` ` `// Start with the empty list` ` ` `Node head = ` `null` `;` ` ` `// Create the doubly linked list:` ` ` `// 2<->2<->10<->8<->4<->2<->5<->2` ` ` `head = push(head, 2);` ` ` `head = push(head, 5);` ` ` `head = push(head, 4);` ` ` `head = push(head, 8);` ` ` `head = push(head, 10);` ` ` `Console.WriteLine(` `"Doubly linked list before deletion:"` `);` ` ` `printList(head);` ` ` `int` `n = 2;` ` ` ` ` `// delete node at the given position 'n'` ` ` `deleteNodeAtGivenPos(head, n);` ` ` `Console.WriteLine(` `"Doubly linked list after deletion:"` `);` ` ` `printList(head);` ` ` `}` `}` `// This code is contributed by Arnab Kundu` |

## Javascript

`<script>` `/* javascript implementation to delete a` ` ` `doubly Linked List node` ` ` `at the given position */` `// A node of the doubly linked list` `class Node {` ` ` `constructor() {` ` ` `this` `.data = 0;` ` ` `this` `.prev = ` `null` `;` ` ` `this` `.next = ` `null` `;` ` ` `}` ` ` `}` `var` `head = ` `null` `;` ` ` `// Function to delete a node` ` ` `// in a Doubly Linked List.` ` ` `// head_ref --> pointer to head node pointer.` ` ` `// del --> pointer to node to be deleted.` ` ` `function` `deleteNode(del) {` ` ` `// base case` ` ` `if` `(head == ` `null` `|| del == ` `null` `)` ` ` `return` `null` `;` ` ` `// If node to be deleted is head node` ` ` `if` `(head == del)` ` ` `head = del.next;` ` ` `// Change next only if node to be` ` ` `// deleted is NOT the last node` ` ` `if` `(del.next != ` `null` `)` ` ` `del.next.prev = del.prev;` ` ` `// Change prev only if node to be` ` ` `// deleted is NOT the first node` ` ` `if` `(del.prev != ` `null` `)` ` ` `del.prev.next = del.next;` ` ` `del = ` `null` `;` ` ` `return` `head;` ` ` `}` ` ` `// Function to delete the node at the` ` ` `// given position in the doubly linked list` ` ` `function` `deleteNodeAtGivenPos(n) {` ` ` `/*` ` ` `* if list in NULL or invalid position is given` ` ` `*/` ` ` `if` `(head == ` `null` `|| n <= 0)` ` ` `return` `;` `var` `current = head;` ` ` `var` `i;` ` ` `/*` ` ` `* traverse up to the node at position 'n' from the beginning` ` ` `*/` ` ` `for` `(i = 1; current != ` `null` `&& i < n; i++) {` ` ` `current = current.next;` ` ` `}` ` ` `// if 'n' is greater than the number of nodes` ` ` `// in the doubly linked list` ` ` `if` `(current == ` `null` `)` ` ` `return` `;` ` ` `// delete the node pointed to by 'current'` ` ` `deleteNode(current);` ` ` `}` ` ` `// Function to insert a node` ` ` `// at the beginning of the Doubly Linked List` ` ` `function` `push(new_data) {` ` ` `// allocate node` `var` `new_node = ` `new` `Node();` ` ` `// put in the data` ` ` `new_node.data = new_data;` ` ` `// since we are adding at the beginning,` ` ` `// prev is always NULL` ` ` `new_node.prev = ` `null` `;` ` ` `// link the old list off the new node` ` ` `new_node.next = head;` ` ` `// change prev of head node to new node` ` ` `if` `(head != ` `null` `)` ` ` `head.prev = new_node;` ` ` `// move the head to point to the new node` ` ` `head = new_node;` ` ` `}` ` ` `// Function to print nodes in a` ` ` `// given doubly linked list` ` ` `function` `printList() {` `var` `temp = head;` ` ` `if` `(temp == ` `null` `)` ` ` `document.write(` `"Doubly Linked list empty"` `);` ` ` `while` `(temp != ` `null` `) {` ` ` `document.write(temp.data + ` `" "` `);` ` ` `temp = temp.next;` ` ` `}` ` ` `document.write();` ` ` `}` ` ` `// Driver code` ` ` ` ` `// Create the doubly linked list:` ` ` `// 10<->8<->4<->2<->5` ` ` `push(5);` ` ` `push(2);` ` ` `push(4);` ` ` `push(8);` ` ` `push(10);` ` ` `document.write(` `"Doubly linked "` `+ ` `"list before deletion:<br/>"` `);` ` ` `printList();` ` ` `var` `n = 2;` ` ` `// delete node at the given position 'n'` ` ` `deleteNodeAtGivenPos(n);` ` ` `document.write(` `"<br/>Doubly linked "` `+ ` `"list after deletion:<br/>"` `);` ` ` `printList();` `// This code contributed by gauravrajput1` `</script>` |

**Output:**

Doubly linked list before deletion: 10 8 4 2 5 Doubly linked list after deletion: 10 4 2 5

**Time Complexity:** O(n), in the worst case where n is the number of nodes in the doubly linked list.

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