How to Reverse Linked List in C++?
The other method is passing pointers directly to the initialization function of the linked list and creating it using copy constructor when objects are created using the default constructor that copies all fields of an original object into a new object.
Reverse a linked list c++
By Itchy Impala
on Jun 20, 2021
#include<bits/stdc++.h>
using namespace std;
struct node {
int data;
struct node *next;
};
// To create a demo we have to construct a linked list and this
// function is to push the elements to the list.
void push(struct node **head_ref, int data) {
struct node *node;
node = (struct node*)malloc(sizeof(struct node));
node->data = data;
node->next = (*head_ref);
(*head_ref) = node;
}
// Function to reverse the list
void reverse(struct node **head_ref) {
struct node *temp = NULL;
struct node *prev = NULL;
struct node *current = (*head_ref);
while(current != NULL) {
temp = current->next;
current->next = prev;
prev = current;
current = temp;
}
(*head_ref) = prev;
}
// To check our program
void printnodes(struct node *head) {
while(head != NULL) {
cout<<head->data<<" ";
head = head->next;
}
}
// Driver function
int main() {
struct node *head = NULL;
push(&head, 0);
push(&head, 1);
push(&head, 8);
push(&head, 0);
push(&head, 4);
push(&head, 10);
cout << "Linked List Before Reversing" << endl;
printnodes(head);
reverse(&head);
cout << endl;
cout << "Linked List After Reversing"<<endl;
printnodes(head);
return 0;
}
Source: favtutor.com
2
reverse linked list in java to get both head and tail
By Ak Shaw
on May 26, 2020
/*
public class ListNode {
public int val;
public ListNode next;
public ListNode(int x) { val = x; next = null; }
}
*/
public static ListNode[] reverse_linked_list(ListNode head) {
ListNode prev = null;
ListNode current = head;
ListNode next;
ListNode tail = head;
while (current != null) {
next = current.next;
current.next = prev;
prev = current;
current = next;
}
head = prev;
ListNode[] result = {head, tail};
return result;
}
3
how to reverse a linked ist
By Grieving Gnat
on Aug 27, 2020
class LinkedList {
static Node head;
static class Node {
int data;
Node next;
Node(int d)
{
data = d;
next = null;
}
}
/* Function to reverse the linked list */
Node reverse(Node node)
{
Node prev = null;
Node current = node;
Node next = null;
while (current != null) {
next = current.next;
current.next = prev;
prev = current;
current = next;
}
node = prev;
return node;
}
// prints content of double linked list
void printList(Node node)
{
while (node != null) {
System.out.print(node.data + " ");
node = node.next;
}
}
public static void main(String[] args)
{
LinkedList list = new LinkedList();
list.head = new Node(85);
list.head.next = new Node(15);
list.head.next.next = new Node(4);
list.head.next.next.next = new Node(20);
System.out.println("Given Linked list");
list.printList(head);
head = list.reverse(head);
System.out.println("");
System.out.println("Reversed linked list ");
list.printList(head);
}
}
3
reverse a linked list
By Saan
on Sep 08, 2020
class recursion {
static Node head; // head of list
static class Node {
int data;
Node next;
Node(int d)
{ data = d;
next = null; } }
static Node reverse(Node head)
{
if (head == null || head.next == null)
return head;
/* reverse the rest list and put the first element
at the end */
Node rest = reverse(head.next);
head.next.next = head;
/* tricky step -- see the diagram */
head.next = null;
/* fix the head pointer */
return rest;
} /* Function to print linked list */
static void print()
{
Node temp = head;
while (temp != null) {
System.out.print(temp.data + " ");
temp = temp.next;
}
System.out.println();
}
static void push(int data)
{
Node temp = new Node(data);
temp.next = head;
head = temp;
} /* Driver program to test above function*/
public static void main(String args[])
{
/* Start with the empty list */
push(20);
push(4);
push(15);
push(85);
System.out.println("Given linked list");
print();
head = reverse(head);
System.out.println("Reversed Linked list");
print();
} } // This code is contributed by Prakhar Agarwal
4
Revese a Linked List
By Wandering Wolverine
on May 28, 2021
LinkedList<Integer> ll = new LinkedList<>();
ll.add(1);
ll.add(2);
ll.add(3);
System.out.println(ll);
LinkedList<Integer> ll1 = new LinkedList<>();
ll.descendingIterator().forEachRemaining(ll1::add);
System.out.println(ll1);
Source: www.journaldev.com
0
reverse linkedlist
By Wandering Wolverine
on May 13, 2021
Collections.reverse(list);
Source: stackoverflow.com
0
Both solution worked but passing pointers directly were much simpler and more effective.
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