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Thursday Code Puzzler: Does the Linked List Have a Circular Reference?

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Thursday Code Puzzler: Does the Linked List Have a Circular Reference?

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Thursday is code puzzler day here at DZone. The idea is simple: solve the coding problem as efficiently as you can, in any language or framework that you find suitable.

Note: Even though there really is nothing stopping you from finding a solution to this on the internet, try to keep honest, and come up with your own answer.  It's all about the participation!

Do you have code puzzlers that you'd like to share with the DZone community?  If so, please submit here. 

Determine if there is a circular reference in a linked list

Given a single linked list, write a method that will determine if the "next" pointer of one of the nodes is pointing to a previous node in your list.


Catch up on all our previous puzzlers here.

Learn how the Actor model provides a simple but powerful way to design and implement reactive applications that can distribute work across clusters of cores and servers. Brought to you in partnership with Lightbend.

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