# How do you reverse a linked list K element?

## How do you reverse a linked list K element?

Reverse first K elements of given linked list

1. Traverse the linked list till K-th point.
2. Break the linked list in to two parts from k-th point.
3. Reverse first part of the linked list leave second part as it is 3->2->1->NULL and 4->5->NULL.
4. Join both the parts of the linked list, we get 3->2->1->4->5->NULL.

Can you reverse a linked list?

In a singly linked list, order is determined by a given node’s next property. This property can either reference another node or will point to null if this is the last node in the list. So reversing a linked list, simply means reassigning all the next properties, on every node.

How many pointers reverse a linked list?

2 pointers
Iteratively Reverse a linked list using only 2 pointers (An Interesting Method) – GeeksforGeeks.

### How do you reverse a singly linked list algorithm?

Reversing a singly linked list (Recursive approach)

1. Break the linked list into two parts – first node and rest of the linked list.
2. Call reverse function for rest of the linked list.

What will be the elements of given singly linked list?

Singly linked lists contain nodes which have a data field as well as ‘next’ field, which points to the next node in line of nodes. Operations that can be performed on singly linked lists include insertion, deletion and traversal.

How do you remove duplicate nodes in linked list?

Write a removeDuplicates() function that takes a list and deletes any duplicate nodes from the list. The list is not sorted. For example if the linked list is 12->11->12->21->41->43->21 then removeDuplicates() should convert the list to 12->11->21->41->43.

## How do you compare two linked lists?

Given two strings, represented as linked lists (every character is a node in a linked list). Write a function compare() that works similar to strcmp(), i.e., it returns 0 if both strings are the same, 1 if the first linked list is lexicographically greater, and -1 if the second string is lexicographically greater.

How do you return a linked list in C++?

We assign the temp node to the next of the current node and then reverse the link by assign the current->next to the previous node. And then increment the previous node to the current node and then the current node to the temp node. And then we finally return the head node.

How do you swap two values in a linked list?

Algorithm

1. Create a class Node which has two attributes: data and next.
2. Create another class SwapNodes which has two attributes: head and tail.
4. swap() will swap the given two nodes present in the list:
5. display() will display the nodes present in the list:

### Which sort is best for linked list?

Merge sort
Merge sort is often preferred for sorting a linked list. The slow random-access performance of a linked list makes some other algorithms (such as quicksort) perform poorly, and others (such as heapsort) completely impossible.

How to reverse the first K of a linked list?

Given pointer to the head node of a linked list and a number K, the task is to reverse the first K nodes of the linked list. We need to reverse the list by changing links between nodes.

How to reverse the nodes in a linked list?

Given a linked list, reverse the nodes of a linked list k at a time and return its modified list. k is a positive integer and is less than or equal to the length of the linked list. If the number of nodes is not a multiple of k then left-out nodes in the end should remain as it is.

## How to reverse the nodes in a K group?

Reverse Nodes in k-Group. Hard. Given a linked list, reverse the nodes of a linked list k at a time and return its modified list. k is a positive integer and is less than or equal to the length of the linked list. If the number of nodes is not a multiple of k then left-out nodes in the end should remain as it is.

How to reverse a linked list in groups of given size?

Given a linked list, write a function to reverse every k nodes (where k is an input to the function). Recommended: Please solve it on “ PRACTICE ” first, before moving on to the solution. Reverse the first sub-list of size k. While reversing keep track of the next node and previous node.

12/02/2019