Reverse Linked List | The 3-Pointer Flip | LeetCode 75 #31

Reverse Linked List — LeetCode 206 (Easy) — explained in Hindi, animated step by step. We reverse a singly linked list in one pass with three pointers (prev, curr, next) — O(n) time, O(1) space. This video covers the three hard parts beginners get stuck on: why you must save `next` before flipping (the burnt bridge), why the order of the loop lines matters (the boomerang bug), and why we return `prev` and not `curr`. Full animated dry run on 1-2-3-4-5, line-by-line C++ code with the WHY behind every line, edge cases (empty, single node, two nodes), a plain-words correctness proof, and the recursive follow-up interviewers love to ask. Problem: https://leetcode.com/problems/reverse... Chapters: 0:00 Intro — the 3 hard parts 2:00 Problem statement + examples 5:00 Naive ideas (and why they fail) 7:00 The core idea — the train-in-the-tunnel story 10:00 Hard part 1 — save next first (the burnt bridge) 12:30 Hard part 2 — line order (the boomerang bug) 14:30 Hard part 3 — return prev, not curr 16:00 Full dry run 1-2-3-4-5 19:00 C++ code, line by line with WHY 22:00 Edge cases 23:30 Correctness proof + complexity 25:00 Interview Q&A — recursive follow-up #LeetCode75 #ReverseLinkedList #LinkedList #DSA #CodingInterview #Placements #DSAinHindi #Cpp