The Road To Google From Scratch — Linked List Cycle Floyd's Algorithm Solution

In this video we implement the optimized solution for the Linked List Cycle problem using Floyd's Tortoise and Hare algorithm. Instead of using a HashSet to track visited nodes, we use two pointers moving at different speeds — if there is a cycle, the fast pointer will eventually catch up to the slow one. We break down the solution step by step: 1.Understand the problem requirements — determine if a linked list contains a cycle 2.Design the approach: use two pointers (slow and fast) starting at the head, where slow moves one step and fast moves two steps at a time 3.Iterate while fast and fast.next are non-null — advance both pointers at their respective speeds 4.Check for collision — if slow and fast meet at the same node, a cycle exists 5.Return false if fast reaches the end of the list — no cycle is present 6.Handle edge cases — empty list, single node, or two nodes without a cycle Timeline: 0:00 - Condition 1:00 - Visualization 3:05 - Solution #leetcode #linkedlistcycle #linkedlist #codinginterview #java #python #algorithms #datastructures #easy #faang #interviewprep #twopointers #floydsalgorithm #tortoiseandhare