Linked List Cycle II: Floyd’s Cycle Detection (Tortoise and Hare) Explained | Leetcode 142

# Mastering Linked List Cycle II: Floyd's Tortoise and Hare Explained
In this video, we tackle one of the most common and critical Linked List interview questions: **Linked List Cycle II (LeetCode #142)**.
https://leetcode.com/problems/linked-list-cycle-ii/description/

While detecting a cycle is relatively straightforward, finding the **exact node where the cycle begins** requires a clever trick and some simple mathematics.

We dive deep into **Floyd's Cycle-Finding Algorithm**, popularly known as the **Tortoise and Hare algorithm**. We won't just look at the code; we will visually explain the logic and the mathematical proof that makes the solution work in O(n) time and O(1) space.

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### 🚀 Problem Link:
[Link to LeetCode #142 or problem source]

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### 🕒 Timestamps:
0:00 - Introduction & Problem Statement
1:30 - The Conceptual Challenge (Why it’s tricky)
3:00 - Phase 1: Detecting the Cycle (Meeting Point)
5:00 - Phase 2: Finding the Entry Node (Logic)
7:00 - The Mathematical Proof (Why it works!)
9:30 - Code Implementation Walkthrough [mention your language, e.g., Python/Java]
12:00 - Complexity Analysis (Time & Space)
13:30 - Summary & Interview Tips

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### 💡 Key Concepts Covered:
* Linked Lists & Pointers
* Floyd's Cycle-Finding Algorithm
* Tortoise and Hare Mechanism
* Optimal Space Complexity (O(1))

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Видео Linked List Cycle II: Floyd’s Cycle Detection (Tortoise and Hare) Explained | Leetcode 142 канала Code with Rahul