How to convert circular linked list into singly linked list?

Discussion in 'C' started by Tabb1us, Jun 22, 2022.

  1. Tabb1us

    Tabb1us New Member

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    First, I create a circular linked list that looks like this:
    Code:
    1 -> 2 -> 3 -> 4 -> 5 -> 6 -> (head)
    Now I'm attempting to convert this circular linked list into a singly linked list, which is the desired result. I'm attempting to eliminate circularity by substituting null for (head).
    Code:
    1 -> 2 -> 3 -> 4 -> 5 -> 6 -> null
    This is my code:
    Code:
    public class Main
    {
        class Node
        {
            Integer data;
            Node next;
            Node(Integer data)
            {
                this.data = data;
                this.next = null;
            }
        }
        
        Node head = null;
        Node tail = null;
        
        public void add(Integer data)
        {
            Node newNode = new Node(data);
            if(head == null)
            {
                head = newNode;
                tail = newNode;
            }
            else
            {
                tail.next = newNode;
            }
            
            tail = newNode;
            tail.next = head;
        }
        
        public Node detectCycle()
        {
            if(head == null)
            {
                System.out.print("list is empty");
            }
            
            Node slow = head;
            Node fast = head;
            while(fast != null && fast.next != null)
            {
                fast = fast.next.next;
                slow = slow.next;
                
                if(fast == slow)
                {
                    return slow;
                }
            }
            return null;
        }
        
        public Integer detectFirstNode()
        {
            Node meetingNode = detectCycle();
            Node start = head;
            // Here i want to remove connection of that node with null who create circular linked list
            
            while(start != meetingNode)
            {
                meetingNode = meetingNode.next;
                start = start.next;
            }
            
            return start.data;
        }
        
        public void printList()
        {
            Node curr = head;
            do
            {
                System.out.print(curr.data + " -> ");
                curr = curr.next;
            }while(curr != head);
        }
        
        public void printList2()
        {
            Node currNode = head;
            while(currNode != null)
            {
                System.out.print(currNode.data + " -> ");
                currNode = currNode.next;
            }
            System.out.println("null");
        }
        
        public static void main(String[] args) {
            Main m = new Main();
            m.add(1);
            m.add(2);
            m.add(3);
            m.add(4);
            m.add(5);
            m.add(6);
            
            m.printList();
            System.out.println("\nFirst Node who create circular linked list is : " + m.detectFirstNode());
            m.printList2();
        }
    }
    Can someone assist me?
     
  2. Tabb1us

    Tabb1us New Member

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    Code:
    public Integer detectFirstNode() {
    
    
        Node meetingNode = detectCycle();
        Node start = head;
    
        do{
            meetingNode = meetingNode.next;
        } while (start != meetingNode.next);
    
        meetingNode.next = null;
    
        return start.data;
    }
     
  3. shabbir

    shabbir Administrator Staff Member

    Joined:
    Jul 12, 2004
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    What issue are you facing? I mean what assistance do you need?
     

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