# Puzzle: Can you get the loop ? [algorithms]

Can you get the loop ?” is a coding puzzle that people can be attempted in the following languages: ruby, javascript, python, java, haskell, csharp, php, and kotlin.

• Difficulty: 5 kyu
• Stars: 992
• Category: algorithms
• Tags: Algorithms, Hacking Holidays, Logic
• Source: codewars

# Description

You are given a node that is the beginning of a linked list. This list always contains a tail and a loop.

Your objective is to determine the length of the loop.

For example in the following picture the tail’s size is 3 and the loop size is 11.

<div style=“overflow-y:hidden;height:450px;margin-bottom:20px”><img style=‘position: relative;top: -160px’ src=“https://i.imgur.com/Rc6RPT5.png” border=“0” alt=“Image and video hosting by TinyPic”></div>

``````ruby
# Use the `next' method to get the following node.

node.next

``````
``````javascript
// Use the `getNext' method or 'next' property to get the following node.

node.getNext()
node.next

``````
``````python
# Use the `next' attribute to get the following node

node.next

``````
``````java
// Use the `getNext()` method to get the following node.

node.getNext()

``````
``````haskell
-- use the `next :: Node a -&gt; Node a` function to get the following node

``````
``````cs
# Use the `next' method to get the following node.

node.next

``````
``````Use the `Node::getNext()` instance method to get the following node.

```
php
\$node-&gt;getNext();

```

``````
``````Use the `Node.next` to get the next following node.

```
kotlin
node.next

```

``````

Note: do NOT mutate the nodes!

> Thanks to shadchnev, I broke all of the methods from the Hash class.

> Don’t miss dmitry’s article in the discussion after you pass the Kata !!

# Solve It Here

Click the link below to solve it on Codewars:

# Notes

This puzzle was posted by a Slackbot via a slash command. If you want to help work on the app, send a message to @Josh.

If you don’t want to see the coding puzzles when you visit the forum, you can go into your settings and mute the puzzles category.

1 Like

I did this one in Python.