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Move last element of the Linked List at first place


In the given linked list write a program to move last element to front of the linked list


In this figure, we are moving last node to the front of the given linked list.


Time complexity: O(n)

Step 1 : create a function which takes linked list as argument and gives a new linked list with last element in front.
Step 2 : Traverse till last node.
a)    Store both last and second last node.
Step 3 : Make the second last node as last node.
a)    make the next of second last as NULL as after moving it will become the last node.
Step 4 : Make next of last as head.
a)    last->next = *head makes the last node’s next as head.
Step 5 : Make the last node the head.
a)    This is done by giving changing the head pointer to last.
Step 6 : call the function on given linked list. It will print a new linked list with last as head.

Algorithm working Example

C++ Program

#include <bits/stdc++.h>
using namespace std;

struct LL{
	int data;
	LL *next;	

void insertAtBeginning(struct LL**head,int dataToBeInserted)
	struct LL* curr=new LL;
			*head=curr; //if this is first node make this as head of list
			curr->next=*head; //else make the current (new) node's next point to head and make this new node a the head
		//O(1) constant time

void moveLastNode(struct LL **head) 
	struct LL *temp = *head;
	struct LL * last , *secondLast;
	while(temp->next->next != NULL) // traverse till second last node
		temp = temp->next;
	secondLast = temp;
	last = temp->next;
	secondLast->next = NULL; //make the next of second last as NULL as after moving it will become the last node
	last->next = *head; //make the last node's next as head
	*head = last; //make the last node the head

void display(struct LL**head)
	struct LL*temp=*head;
			cout<<temp->data<<" ->";
			temp=temp->next; //move to next node
		//O(number of nodes)

int main()
	struct LL *head = NULL; //initial list has no elements
	cout<<"The list initially is :-\n";
	cout<<"\nAfter moving last node to front the list becomes :-\n";
	return 0;

READ  Detect a loop in the Linked List

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