Slink Insertion
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Slink Insertion
Insertion Sort for Singly Linked List
Difficulty Level :
Medium
Last Updated :
13 Jul, 2020
/* C program for insertion sort on a linked list */
// Function to insert a given node in a sorted linked list
void sortedInsert( struct Node**, struct Node*);
// function to sort a singly linked list using insertion sort
void insertionSort( struct Node **head_ref)
// Initialize sorted linked list
// Traverse the given linked list and insert every
struct Node *current = *head_ref;
// Store next for next iteration
struct Node *next = current->next;
// insert current in sorted linked list
sortedInsert(&sorted, current);
// Update head_ref to point to sorted linked list
/* function to insert a new_node in a list. Note that this
function expects a pointer to head_ref as this can modify the
head of the input linked list (similar to push())*/
void sortedInsert( struct Node** head_ref, struct Node* new_node)
/* Special case for the head end */
if (*head_ref == NULL || (*head_ref)->data >= new_node->data)
new_node->next = *head_ref;
/* Locate the node before the point of insertion */
while (current->next!=NULL &&
current->next->data < new_node->data)
current = current->next;
new_node->next = current->next;
/* BELOW FUNCTIONS ARE JUST UTILITY TO TEST sortedInsert */
/* Function to print linked list */
void printList( struct Node *head)
printf ( "%d " , temp->data);
/* A utility function to insert a node at the beginning of linked list */
void push( struct Node** head_ref, int new_data)
struct Node* new_node = new Node;
/* link the old list off the new node */
/* move the head to point to the new node */
// Driver program to test above functions
printf ( "Linked List before sorting \n" );
printf ( "\nLinked List after sorting \n" );
node newnode = new node(val);
/* link the old list off the new node */
/* move the head to point to the new node */
// function to sort a singly linked list using insertion sort
void insertionSort(node headref)
// Initialize sorted linked list
// Traverse the given linked list and insert every
while (current != null )
// Store next for next iteration
node next = current.next;
// insert current in sorted linked list
sortedInsert(current);
// Update head_ref to point to sorted linked list
* function to insert a new_node in a list. Note that
* this function expects a pointer to head_ref as this
* can modify the head of the input linked list
void sortedInsert(node newnode)
/* Special case for the head end */
if (sorted == null || sorted.val >= newnode.val)
newnode.next = sorted;
node current = sorted;
/* Locate the node before the point of insertion */
while (current.next != null && current.next.val < newnode.val)
current = current.next;
newnode.next = current.next;
current.next = newnode;
/* Function to print linked list */
System.out.print(head.val + " " );
// Driver program to test above functions
public static void main(String[] args)
LinkedlistIS list = new LinkedlistIS();
System.out.println( "Linked List before Sorting.." );
list.printlist(list.head);
list.insertionSort(list.head);
System.out.println( "\nLinkedList After sorting" );
list.printlist(list.head);
// This code is contributed by Rishabh Mahrsee
# Pyhton implementation of above algorithm
# Constructor to initialize the node object
# function to sort a singly linked list using insertion sort
# Initialize sorted linked list
# Traverse the given linked list and insert every
# Store next for next iteration
# insert current in sorted linked list
sorted = sortedInsert( sorted , current)
# Update head_ref to point to sorted linked list
# function to insert a new_node in a list. Note that this
# function expects a pointer to head_ref as this can modify the
# head of the input linked list (similar to push())
def sortedInsert(head_ref, new_node):
# Special case for the head end */
if (head_ref = = None or (head_ref).data > = new_node.data):
new_node. next = head_ref
# Locate the node before the point of insertion
while (current. next ! = None and
current. next .data < new_node.data):
current = current. next
new_node. next = current. next
current. next = new_node
# BELOW FUNCTIONS ARE JUST UTILITY TO TEST sortedInsert
print ( temp.data, end = " " )
# A utility function to insert a node
# link the old list off the new node
# move the head to point to the new node
# Driver program to test above functions
print ( "Linked List before sorting " )
print ( "\nLinked List after sorting " )
# This code is contributed by Arnab Kundu
node newnode = new node(val);
/* link the old list off the new node */
/* move the head to point to the new node */
// linked list using insertion sort
void insertionSort(node headref)
// Initialize sorted linked list
// linked list and insert every
while (current != null )
// Store next for next iteration
node next = current.next;
// insert current in sorted linked list
sortedInsert(current);
// Update head_ref to point to sorted linked list
* function to insert a new_node in a list. Note that
* this function expects a pointer to head_ref as this
* can modify the head of the input linked list
void sortedInsert(node newnode)
/* Special case for the head end */
if (sorted == null || sorted.val >= newnode.val)
newnode.next = sorted;
node current = sorted;
/* Locate the node before the point of insertion */
while (current.next != null &&
current.next.val < newnode.val)
current = current.next;
newnode.next = current.next;
current.next = newnode;
/* Function to print linked list */
Console.Write(head.val + " " );
public static void Main(String[] args)
LinkedlistIS list = new LinkedlistIS();
Console.WriteLine( "Linked List before Sorting.." );
list.printlist(list.head);
list.insertionSort(list.head);
Console.WriteLine( "\nLinkedList After sorting" );
list.printlist(list.head);
// This code contributed by Rajput-Ji
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We have discussed Insertion Sort for arrays . In this article same for linked list is discussed.
Below is simple insertion sort algorithm for linked list.
The main step is (2.a) which has been covered in below post.
Sorted Insert for Singly Linked List
Below is implementation of above algorithm
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Insertion Sort for Singly Linked List - GeeksforGeeks
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