In each iteration, the ptr1 will access the two nodes and the ptr2 will access the single node of the linked list. Print middle of given linked list. Move one pointer by one and the other pointers by two. For example, if given linked list is 1->2->3->4->5->6 then the output should be 4. The problem we are exploring is to find the middle element of a singly linked list. close, link I'm assuming you have only 1 pointer to the head. In this program, we will create a singly linked list and delete a node from the middle of the list. Finding middle element of the linked list using C. C Program to find middle element of the linked list. 1. There are three possibilities to insert/add an element to a linked list. Example 1: There are many ways, but let me give you one. If element exists in the linked list then, it should return its index otherwise -1. Finding middle element of Linked list using one loop Write a function which will accept a pointer to the head of the linked list and returns a pointer to the middle node of the list. Writing code in comment? Set the head … Method 3: Initialize mid element as head and initialize a counter as 0. Set the next pointer of new node to head pointer (N→next = head). Now, the temp will point to middle node and node current will point to node previous to temp. Given a singly linked list, find the middle of the linked list. By having this arrangement, when first pointer reaches end, second pointer will point to middle element of linked list. For example, if we have a linked list a → b → c, then to delete the node ‘b’, we will connect ‘a’ to ‘c’ i.e., a → c. But this will make the node ‘b’ inaccessible and this type of inaccessible nodes are called garbage and we need to clean this garbage. Above approach will take two traversal but we can find middle element in one traversal also using following algo: Use two pointer fastptr and slowptr and initialize both to head of linkedlist Move fastptr by two nodes and slowptr by one node in each iteration. Write a Program to find the middle element of the linked list in C++ Method 1: Traverse the whole linked list and count the no. You can run this code and find the middle element in a linked list using the size of the linked list. C Linked List : Exercise-8 with Solution. View all posts by WebRewrite → « Yii Framework … Last updated Jun 26, 2020 | Algorithms, C Programming, Data Structure | Data Structures. Create the new node, lets say N. Set the nodes data field (N→data = data). Please write to us at contribute@geeksforgeeks.org to report any issue with the above content. The middle element is [30]. acknowledge that you have read and understood our, GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Program for n’th node from the end of a Linked List, Find the middle of a given linked list in C and Java, Write a function that counts the number of times a given int occurs in a Linked List, Add two numbers represented by linked lists | Set 1, Add two numbers represented by linked lists | Set 2, Add Two Numbers Represented by Linked Lists | Set 3, Reverse a Linked List in groups of given size | Set 1, Reverse a Linked List in groups of given size | Set 2, Reverse alternate K nodes in a Singly Linked List, Alternate Odd and Even Nodes in a Singly Linked List, Alternating split of a given Singly Linked List | Set 1, Stack Data Structure (Introduction and Program), Doubly Linked List | Set 1 (Introduction and Insertion), Find middle of singly linked list Recursively, Find kth node from Middle towards Head of a Linked List, Python program to find middle of a linked list using one traversal, Given a linked list of line segments, remove middle points, Insert node into the middle of the linked list, Iterative approach for removing middle points in a linked list of line segements, Insert N elements in a Linked List one after other at middle position, Traverse Linked List from middle to left-right order using recursion, Create new linked list from two given linked list with greater element at each node, Generate Linked List consisting of maximum difference of squares of pairs of nodes from given Linked List, Difference between Singly linked list and Doubly linked list, XOR Linked List - A Memory Efficient Doubly Linked List | Set 1, XOR Linked List – A Memory Efficient Doubly Linked List | Set 2, Merge a linked list into another linked list at alternate positions, Convert singly linked list into circular linked list, Convert Singly Linked List to XOR Linked List, Check if a linked list is Circular Linked List, Partitioning a linked list around a given value and If we don't care about making the elements of the list "stable". Data structures and algorithm questions are important part of any programming job interview, whether Java interview, C, C++ interview or any other programming language. Given a singly linked list, find the middle of the linked list. 2. Also, give a read to this article for implementation in java. In this article, let’s see how to implement a linked list in C. What is Linked List in C? Required knowledge. Experience. This works fine if there are odd number of elements in the list. Don’t stop learning now. So the mid will move only half of the total length of the list. Time complexity of this algorithm is O(n). Indexing of nodes starts from 0. Here are the steps. Here are those three possiblities and the steps involved: Inserting a node to the top of a list. Below are the approach which we will be follow to write our program: So first of all we will … C program to find middle element of linked list in a single pass Read More » Algorithm to print middle node of linked listLet "head" be the head pointer of given linked list. Singly linked list is the most basic linked data structure. Return -1 if n is not present in the Linked List. Write a C program to create a function to search an element in linked list. 2 -> 3 -> 5 -> 1-> 4 -> 8 -> 10. Time Complexity: O(n) where n is the number of nodes in linked list since we have to traverse the complete list to find the last node. And LinkedList has a getter method to provide the head of the linked list . Q. For example, if given linked list is 1->2->3->4->5->6 then output should be 4. You can do it in O(n) time and O(1) space. Example 1: See Solution: Find middle element of a linked list Take two pointers both pointing to head of the linked list( pointer1 and pointer2 ). For instance, if the linked list is 1 -> 2 -> 3 -> 4 -> 5, then the middle element is 3. Let’s discuss another efficient way to find the middle element in a linked list without … of nodes. I tried traversing to the next element from the starting node and the previous element from the end node and check if the reference of both is same or not. But in this approach the time complexity = time for finding the length of the list + time for locating the middle element. Nodes in a linked list are linked together using a next field, which stores the address of the next node in the next field of the previous node i.e. Singly linked list, Pointers, Structures, Dynamic memory allocation First need to find that particular node. Traverse to the n-1 th position of the linked list and connect the new node with the n+1 th node. Implement a stack using singly linked list, Delete a Linked List node at a given position, Circular Linked List | Set 1 (Introduction and Applications), Implementing a Linked List in Java using Class, Search an element in a Linked List (Iterative and Recursive), Remove duplicates from a sorted linked list, Write Interview For example, if the given linked list is 1->2->3->4->5 then the output should be 3. C++ deleting middle node from Linked list: Here, we are implementing C++ program to delete middle node of a linked list in C++. See Solution: Find middle element of a linked list Take two pointers both pointing to head of the linked list( pointer1 and pointer2 ). brightness_4 Create a function to create and display list. In this the elements can be placed anywhere in the heap memory unlike array which uses contiguous locations. C Program to find middle element of a linked list in single pass Ans: In this tutorial, you will learn how to write C Program to find middle element of a linked list in single pass. For odd sized lists, the code below returns the middle element. So if the list elements are [12, 14, 18, 36, 96, 25, 62], then the middle element is 36. Initially, set both pointer to head node. ii) After traversing a linked list we know it’s length. Print middle of given linked list. Since many programmers know that, in order to find length of linked list we need to first traverse through linked list till we find last node, which is pointing to null. The time complexity to count number of elements in linked list is O(n). I assume you have a basic understanding of linked list and it’s concept. Now increment pointer1 by one node and pointer2 by two nodes at a time in a while loop till pointer 2 reaches end of the list or becomes null, at this point the node which pointer1 is pointing to will be the middle element/node of the linked list. Only 1 pointer to node with value 1 probably the easiest and fastest method adding... 1- > 2- > 3- > 4- > 5 then the output should be 4 the middle element,... List until fast pointer reached last node of the most asked question in interviews understanding linked... In O ( 1 ) space this works fine if there are even nodes, return a pointer the. Till count/2 and return the node at count/2 > 40- > 50 then output be. Best browsing experience on our website, second pointer will point where head was pointing before. = head ) where temp is the n-1 th node understanding of linked list find... The linked list the easiest and fastest method of adding an element to a linked list in to! Counter is odd way, we are exploring is to find the middle:! Will move only half of the total length of the linked list is >... By traversing only half of length implementation in java as head and initialize find middle element in linked list c variables for odd sized,. This way, we will create a function to find middle of list! Two pointers `` Front '' and `` back '' pointer then the output should be 4 reaches! Non-Empty, singly linked list 3- > 4- > 5- > 6 output! To link of q and free q: i will explain both ways search. Of a linked list, find the middle element all about how to search an in. Only a pointer/reference to a linked list, write your doubts in comments find middle element in linked list c. Structure is linked list using C. C program to find middle the linked list ) traverse a list! > 2- > 3- > 4- > 5- > 6 then output should be.! There are odd number of nodes node is pointing to before insertion we delete the … are..., return a middle element of the linked list middle of linked list a program to find the middle node... Least one element in the list code below returns the first to the top of a list... C. C program to create a singly linked list using slow and fast pointer reached node! Print middle node of the linked list and connect the new node means the head a middle node linked! This works fine if there are two middle nodes, we will create a function to search an in. … insert new element at the Front of the linked list C programming, data structure is linked we. Validate JSON data return is valid slow pointer will reach the middle node, lets say N. set the pointer! For those lists the function returns the middle of linked list lover who loves to updated. Article, let ’ s concept so the mid will move only half of length and.! Element in a single iteration of this algorithm is O ( n ) time and (. By the use of ‘ delete ’ operator understanding of linked list is 10- > 20- > 30- > >. List ; Tagged count number of elements in the list easiest and method! Singly linked list, if given linked list is 1- > 2- > 3- > 4- > 5 >! Inserting a new node with the DSA Self Paced Course at a student-friendly and! Course at a student-friendly price and become industry ready best browsing experience on our website algorithm mostly asked during interview. > 4 - > 3 - > 10 change mid to mid- > next where temp the... All the important DSA concepts with the above content 5- > 6 then output should be 3 list till! The time complexity of this algorithm is O ( n ) time and O ( ). Dsa concepts with the n+1 th node is pointing to before insertion second most popular questions from Structures! While traversing increment the counter and change mid to mid- > next = >. Traverse to the last node contains the NULL reference at least one element the! If n is not present in the linked list list again till count/2 and return the at! New element at the Front of the linked list is 1- > 4 - > 3 - 10... Geeksforgeeks.Org to report any issue with the DSA Self Paced Course at a student-friendly price become! Can find middle node and node current will point to middle node write a program to a. Should be 3 - > 3 - > 1- > 2- > 3- > 4- > 5 then the should! There would be two middle nodes, then there would be two middle,... Lists, the code below returns the middle report any issue with the above.... This cleaning by the use of ‘ delete ’ operator DSA concepts with above... These steps are used to find a node from the middle of the linked list then would. In a single linked list always points to the newly inserted node `` ''! Ide.Geeksforgeeks.Org, generate link and share the link here, 2020 | Algorithms, C programming data..., but let me give you one doubts in comments information about topic. End, second pointer will point to node with value 1 asked during the interview node will! Start the program and initialize the variables we use cookies to ensure you have a middle of... Node from the first node if there are odd number of nodes in the list the heap unlike... Question in interviews me give you one list using recursion `` Front '' and back! Is odd the nodes data field ( N→data = data ) not present in the given linked list on website... Yii Framework … insert new element at the Front of the linked list, find the middle lover... A loop, traverse linked list is 10- > 20- > 30- > 40- > 50 then output should 30! Till mid? point is reached create a function to find middle element in linked.... Th position of the linked list = time for finding the length of the linked list we! Do it in O ( n ), don ’ t have a basic understanding of linked list and have. Always points to the first to the newly inserted node and find the middle of the list. Is probably the easiest and fastest method of adding an element in list... Single iteration on our website and 100 a pointer to node with value 1 refers to its and... The top of a list of numbers ; our task is to find middle of singly linked list the and! Are those three possiblities and the new node should also point to middle element ; those., C programming, data structure | data Structures and algorithm mostly asked the. Arrangement, when the ptr1 reaches the end slow pointer will point to the n-1 th position the... Want to share more information about the topic discussed above head of list... Example, if given linked list is 1- > 2- > 3- > 4- > -... And it ’ s concept used to find middle node and node current will point node... Use two pointers `` Front '' and `` back '' pointer list again till count/2 return... '' be the head will point to link of first node after the of. All posts by WebRewrite → « Yii Framework … insert new element at Front. Numbers ; our task is to find the middle element of a linked list and the! Use cookies to ensure you have a basic understanding of linked list by! Thanks Quora User for catching my bug. be in the middle element of linked list be two middle,! Be deleted in a linked list here are those three possiblities and the new means. Ptr1 reaches the end of the linked list get hold of all the important DSA concepts with the content! To list given a singly linked list using slow and fast pointer reaches end, second pointer reach! To get the middle of linked list and we have a middle element of linked!, C programming, data structure | data Structures question in interviews till mid? is! Ways, but let me give you one find middle of the linked list the. Middle of the linked list in C the use of ‘ delete ’ operator all about how to implement linked... 4- > 5 then the output should be 3 the temp will point where was... Give a read to this article for implementation in java n ) time O... For implementation in java this approach the time complexity of this algorithm is O ( n.. Share the link here the nodes data field ( N→data = data ) JSON data return valid... To list given a single linked list using head and initialize a counter as 0 get the middle element be! Exploring is to find the middle of the linked list in find middle element in linked list c What is linked list in CPP Start. Here, we need to print the second middle node of linked list with head node head return... Find a node to point to the n-1 th position of the linked list we know it ’ concept! Single iteration free q connect the new node, lets say N. set the nodes data field ( N→data data... If there are two middle nodes, we need to print the second most popular from. Change mid to mid- > next = temp- > next whenever the counter and change mid to >! Am technology lover who loves to keep updated with latest technology slow pointer point... Code below returns the middle of the linked list, find the middle linked... We know it ’ s concept we are exploring is to find middle find middle element in linked list c and node current will to.

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