Loop Detection: Twitter Problem | LeetCode 141 {Using Pointers}

Published: 19 October 2021
on channel: Chris Ibe

In this episode, we solve Cracking the Coding Interview Problem Loop Detection where we are given a linked list that might contain a loop and asked to locate the loop. We solve this in O(n) linear runtime and O(1) memory using the runner method with 2 pointers. A fast and a slow pointers.

Watch and enjoy.

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Problem Statement:
Loop Detection: Given a linked list which might contain a loop, implement an algorithm that returns the node at the beginning of the loop (if one exists).

EXAMPLE
Input: A - B - C - D - C [the same C as earlier]
Output: C

Hints:
There are really two parts to this problem. First, detect if the linked list has a loop. Second, figure out where the loop starts.
Try the “runner” method. Using a fast and a slow pointer.

LeetCode link: https://leetcode.com/problems/linked-...

Motivation Quotes:
https://graciousquotes.com/hard-work-...
https://www.birthdaywishes.expert/har...

Amazon Link: https://www.amazon.com/Cracking-Codin...

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