Timer is Running

Given a linked list of N nodes. The task is to check if the the linked list has a loop. Linked list can contain self loop.

Example 1:

N = 3
value[] = {1,3,4}
x = 2
Output: True
Explanation: In above test case N = 3.
The linked list with nodes N = 3 is
given. Then value of x=2 is given which
means last node is connected with xth
node of linked list. Therefore, there
exists a loop.

Example 2:

N = 4
value[] = {1,8,3,4}
x = 0
Output: False
Explanation: For N = 4 ,x = 0 means
then lastNode->next = NULL, then
the Linked list does not contains
any loop.

Your Task:
The task is to complete the function detectloop() which contains reference to the head as only argument. This function should return 1 if linked list contains loop, else return 0.

Expected Time Complexity: O(N)
Expected Auxiliary Space: O(1)

1 <= N <= 104
1 <= Data on Node <= 103

** For More Input/Output Examples Use 'Expected Output' option **

Contributor: Harshit Sidhwa
Author: bhawnamait

If you have purchased any course from GeeksforGeeks then please ask your doubt on course discussion forum. You will get quick replies from GFG Moderators there.

Need help with your code? Please use ide.geeksforgeeks.org, generate link and share the link here.

to report an issue on this page.