Describe in detail an algorithm for reversing a singly linked list L using only a constant amount of additional space.
Please provide pseudocode for Java.
//java program to reverse a linked list
import java.io.*;
import java.util.*;
class ReverseLinkedList {
static Node head;
static class Node
{
int val;
Node nxt;
Node(int element)
{
val =
element;
nxt =
null;
}
}
//method to reverse the linked list
Node reverse(Node node)
{
Node prev = null;
Node curr = node;
Node nxt = null;
while (curr != null)
{
nxt =
curr.nxt;
curr.nxt =
prev;
prev =
curr;
curr =
nxt;
}
node = prev;
return node;
}
// prints content of double linked list
void display(Node node) {
while (node != null) {
System.out.print(node.val + " ");
node =
node.nxt;
}
}
public static void main(String[] args)
{
ReverseLinkedList obj = new
ReverseLinkedList();
obj.head = new Node(5);
obj.head.nxt = new Node(10);
obj.head.nxt.nxt = new
Node(4);
obj.head.nxt.nxt.nxt = new
Node(2);
System.out.println("Given Linked
list");
obj.display(head);
head = obj.reverse(head);
System.out.println("");
System.out.println("Reversed linked
list ");
obj.display(head);
System.out.println("");
}
}
output -
Describe in detail an algorithm for reversing a singly linked list L using only a constant...
Describe in detail an algorithm for reversing a singly linked list L using only a constant amount of additional space and not using any recursion.
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