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Algorithm - Interview Questions and Answers for 'Cyclic linkedlist' - 1 question(s) found - Order By Newest

 Q1. Write code to see if a Linked List has cycle in it ?


Write code using Floyd Algorithm to see if a linked list has cycle in it ? What is it's comlexity ?
Ans. public class LinkedList {

Node start = null;
Node head = null;

class Node {
Integer body;
Node nextNode;

Node(Integer value) {
body = value;

public static void main(String[] args) {
LinkedList ll = new LinkedList();



System.out.println("There is a Loop");
} else {
System.out.println("No Loop");

private boolean checkifLoop(Test l1) {
Node slow = start;
Node fast = start;
Node faster = start;
while(slow != null ) {
fast = slow.nextNode;
faster = fast.nextNode;
if(slow == fast || slow == faster) {
return true;
slow = slow.nextNode;
return false;


Complexity of this algorithm is O(n)

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