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Delete a Linked List node at a given position
• Difficulty Level : Easy
• Last Updated : 21 Oct, 2020

Given a singly linked list and a position, delete a linked list node at the given position.

Example:

```Input: position = 1, Linked List = 8->2->3->1->7
Output: Linked List =  8->3->1->7

Input: position = 0, Linked List = 8->2->3->1->7
Output: Linked List = 2->3->1->7

```

If the node to be deleted is the root, simply delete it. To delete a middle node, we must have a pointer to the node previous to the node to be deleted. So if positions are not zero, we run a loop position-1 times and get a pointer to the previous node.

Below is the implementation of the above idea.

## C

 `// A complete working C program to delete a node in a linked list``// at a given position``#include ``#include `` ` `// A linked list node``struct` `Node``{``    ``int` `data;``    ``struct` `Node *next;``};`` ` `/* Given a reference (pointer to pointer) to the head of a list``   ``and an int inserts a new node on the front of the list. */``void` `push(``struct` `Node** head_ref, ``int` `new_data)``{``    ``struct` `Node* new_node = (``struct` `Node*) ``malloc``(``sizeof``(``struct` `Node));``    ``new_node->data  = new_data;``    ``new_node->next = (*head_ref);``    ``(*head_ref)    = new_node;``}`` ` `/* Given a reference (pointer to pointer) to the head of a list``   ``and a position, deletes the node at the given position */``void` `deleteNode(``struct` `Node **head_ref, ``int` `position)``{``   ``// If linked list is empty``   ``if` `(*head_ref == NULL)``      ``return``;`` ` `   ``// Store head node``   ``struct` `Node* temp = *head_ref;`` ` `    ``// If head needs to be removed``    ``if` `(position == 0)``    ``{``        ``*head_ref = temp->next;   ``// Change head``        ``free``(temp);               ``// free old head``        ``return``;``    ``}`` ` `    ``// Find previous node of the node to be deleted``    ``for` `(``int` `i=0; temp!=NULL && inext;`` ` `    ``// If position is more than number of nodes``    ``if` `(temp == NULL || temp->next == NULL)``         ``return``;`` ` `    ``// Node temp->next is the node to be deleted``    ``// Store pointer to the next of node to be deleted``    ``struct` `Node *next = temp->next->next;`` ` `    ``// Unlink the node from linked list``    ``free``(temp->next);  ``// Free memory`` ` `    ``temp->next = next;  ``// Unlink the deleted node from list``}`` ` `// This function prints contents of linked list starting from``// the given node``void` `printList(``struct` `Node *node)``{``    ``while` `(node != NULL)``    ``{``        ``printf``(``" %d "``, node->data);``        ``node = node->next;``    ``}``}`` ` `/* Driver program to test above functions*/``int` `main()``{``    ``/* Start with the empty list */``    ``struct` `Node* head = NULL;`` ` `    ``push(&head, 7);``    ``push(&head, 1);``    ``push(&head, 3);``    ``push(&head, 2);``    ``push(&head, 8);`` ` `    ``puts``(``"Created Linked List: "``);``    ``printList(head);``    ``deleteNode(&head, 4);``    ``puts``(``"\nLinked List after Deletion at position 4: "``);``    ``printList(head);``    ``return` `0;``}`

## Java

 `// A complete working Java program to delete a node in a linked list``// at a given position``class` `LinkedList``{``    ``Node head;  ``// head of list`` ` `    ``/* Linked list Node*/``    ``class` `Node``    ``{``        ``int` `data;``        ``Node next;``        ``Node(``int` `d)``        ``{``            ``data = d;``            ``next = ``null``;``        ``}``    ``}`` ` `    ``/* Inserts a new Node at front of the list. */``    ``public` `void` `push(``int` `new_data)``    ``{``        ``/* 1 & 2: Allocate the Node &``                  ``Put in the data*/``        ``Node new_node = ``new` `Node(new_data);`` ` `        ``/* 3. Make next of new Node as head */``        ``new_node.next = head;`` ` `        ``/* 4. Move the head to point to new Node */``        ``head = new_node;``    ``}`` ` `    ``/* Given a reference (pointer to pointer) to the head of a list``       ``and a position, deletes the node at the given position */``    ``void` `deleteNode(``int` `position)``    ``{``        ``// If linked list is empty``        ``if` `(head == ``null``)``            ``return``;`` ` `        ``// Store head node``        ``Node temp = head;`` ` `        ``// If head needs to be removed``        ``if` `(position == ``0``)``        ``{``            ``head = temp.next;   ``// Change head``            ``return``;``        ``}`` ` `        ``// Find previous node of the node to be deleted``        ``for` `(``int` `i=``0``; temp!=``null` `&& inext is the node to be deleted``        ``// Store pointer to the next of node to be deleted``        ``Node next = temp.next.next;`` ` `        ``temp.next = next;  ``// Unlink the deleted node from list``    ``}`` ` `    ``/* This function prints contents of linked list starting from``        ``the given node */``    ``public` `void` `printList()``    ``{``        ``Node tnode = head;``        ``while` `(tnode != ``null``)``        ``{``            ``System.out.print(tnode.data+``" "``);``            ``tnode = tnode.next;``        ``}``    ``}`` ` `    ``/* Driver program to test above functions. Ideally this function``       ``should be in a separate user class.  It is kept here to keep``       ``code compact */``    ``public` `static` `void` `main(String[] args)``    ``{``        ``/* Start with the empty list */``        ``LinkedList llist = ``new` `LinkedList();`` ` `        ``llist.push(``7``);``        ``llist.push(``1``);``        ``llist.push(``3``);``        ``llist.push(``2``);``        ``llist.push(``8``);`` ` `        ``System.out.println(``"\nCreated Linked list is: "``);``        ``llist.printList();`` ` `        ``llist.deleteNode(``4``);  ``// Delete node at position 4`` ` `        ``System.out.println(``"\nLinked List after Deletion at position 4: "``);``        ``llist.printList();``    ``}``}`

## Python

 `# Python program to delete a node in a linked list``# at a given position`` ` `# Node class ``class` `Node:`` ` `    ``# Constructor to initialize the node object``    ``def` `__init__(``self``, data):``        ``self``.data ``=` `data``        ``self``.``next` `=` `None`` ` `class` `LinkedList:`` ` `    ``# Constructor to initialize head``    ``def` `__init__(``self``):``        ``self``.head ``=` `None`` ` `    ``# Function to insert a new node at the beginning``    ``def` `push(``self``, new_data):``        ``new_node ``=` `Node(new_data)``        ``new_node.``next` `=` `self``.head``        ``self``.head ``=` `new_node`` ` `    ``# Given a reference to the head of a list ``    ``# and a position, delete the node at a given position``    ``def` `deleteNode(``self``, position):`` ` `        ``# If linked list is empty``        ``if` `self``.head ``=``=` `None``:``            ``return` ` ` `        ``# Store head node``        ``temp ``=` `self``.head`` ` `        ``# If head needs to be removed``        ``if` `position ``=``=` `0``:``            ``self``.head ``=` `temp.``next``            ``temp ``=` `None``            ``return` ` ` `        ``# Find previous node of the node to be deleted``        ``for` `i ``in` `range``(position ``-``1` `):``            ``temp ``=` `temp.``next``            ``if` `temp ``is` `None``:``                ``break`` ` `        ``# If position is more than number of nodes``        ``if` `temp ``is` `None``:``            ``return` `        ``if` `temp.``next` `is` `None``:``            ``return` ` ` `        ``# Node temp.next is the node to be deleted``        ``# store pointer to the next of node to be deleted``        ``next` `=` `temp.``next``.``next`` ` `        ``# Unlink the node from linked list``        ``temp.``next` `=` `None`` ` `        ``temp.``next` `=` `next` ` ` ` ` `    ``# Utility function to print the linked LinkedList``    ``def` `printList(``self``):``        ``temp ``=` `self``.head``        ``while``(temp):``            ``print` `" %d "` `%``(temp.data),``            ``temp ``=` `temp.``next`` ` ` ` `# Driver program to test above function``llist ``=` `LinkedList()``llist.push(``7``)``llist.push(``1``)``llist.push(``3``)``llist.push(``2``)``llist.push(``8``)`` ` `print` `"Created Linked List: "``llist.printList()``llist.deleteNode(``4``)``print` `"\nLinked List after Deletion at position 4: "``llist.printList()`` ` `# This code is contributed by Nikhil Kumar Singh(nickzuck_007)`

## C#

 `// A complete working C# program to delete ``// a node in a linked list at a given position``using` `System;`` ` `class` `GFG{``     ` `// Head of list``Node head;  `` ` `// Linked list Node``public` `class` `Node``{``    ``public` `int` `data;``    ``public` `Node next;``     ` `    ``public` `Node(``int` `d)``    ``{``        ``data = d;``        ``next = ``null``;``    ``}``}`` ` `// Inserts a new Node at front of the list. ``public` `void` `Push(``int` `new_data)``{``     ` `    ``/* 1 & 2: Allocate the Node &``              ``Put in the data*/``    ``Node new_node = ``new` `Node(new_data);`` ` `    ``/* 3. Make next of new Node as head */``    ``new_node.next = head;`` ` `    ``/* 4. Move the head to point to new Node */``    ``head = new_node;``}`` ` `// Given a reference (pointer to pointer)``// to the head of a list and a position, ``// deletes the node at the given position ``void` `deleteNode(``int` `position)``{``     ` `    ``// If linked list is empty``    ``if` `(head == ``null``)``        ``return``;`` ` `    ``// Store head node``    ``Node temp = head;`` ` `    ``// If head needs to be removed``    ``if` `(position == 0)``    ``{``         ` `        ``// Change head``        ``head = temp.next;   ``        ``return``;``    ``}`` ` `    ``// Find previous node of the node to be deleted``    ``for``(``int` `i = 0; ``            ``temp != ``null` `&& i < position - 1;``            ``i++)``        ``temp = temp.next;`` ` `    ``// If position is more than number of nodes``    ``if` `(temp == ``null` `|| temp.next == ``null``)``        ``return``;`` ` `    ``// Node temp->next is the node to be deleted``    ``// Store pointer to the next of node to be deleted``    ``Node next = temp.next.next;``     ` `    ``// Unlink the deleted node from list``    ``temp.next = next;  ``}`` ` `// This function prints contents of``// linked list starting from the``// given node ``public` `void` `printList()``{``    ``Node tnode = head;``    ``while` `(tnode != ``null``)``    ``{``        ``Console.Write(tnode.data + ``" "``);``        ``tnode = tnode.next;``    ``}``}`` ` `// Driver code``public` `static` `void` `Main(String[] args)``{``     ` `    ``// Start with the empty list ``    ``GFG llist = ``new` `GFG();`` ` `    ``llist.Push(7);``    ``llist.Push(1);``    ``llist.Push(3);``    ``llist.Push(2);``    ``llist.Push(8);`` ` `    ``Console.WriteLine(``"\nCreated Linked list is: "``);``    ``llist.printList();``     ` `    ``// Delete node at position 4``    ``llist.deleteNode(4);  `` ` `    ``Console.WriteLine(``"\nLinked List after "` `+ ``                      ``"Deletion at position 4: "``);``    ``llist.printList();``}``}`` ` `// This code is contributed by Rajput-Ji`

Output:

```Created Linked List:
8  2  3  1  7
Linked List after Deletion at position 4:
8  2  3  1

```

Thanks to Hemanth Kumar for suggesting initial solution. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above

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