LeetCode 206 | Reverse Linked List | Vector, Stack, 3 Pointers & Recursion скачать в хорошем качестве

LeetCode 206 | Reverse Linked List | Vector, Stack, 3 Pointers & Recursion

In this video, I have explained LeetCode 206 – Reverse Linked List in multiple ways. The goal is to reverse a singly linked list and return the new head. Instead of just solving it once, I covered 4 different approaches to deeply understand the concept. 🧠 Concepts Covered 1. Using Vector to store and reverse values 2. Using Stack (LIFO property) 3. Three Pointer technique (previous, current, next) 4. Recursion approach 5. Time & Space complexity comparison 🚀 Approaches Explained 1️⃣ Vector Approach 1. Store all node values in a vector 2. Reverse the vector 3. Rewrite the linked list ⏱ TC: O(3N) 📦 SC: O(N) 2️⃣ Stack Approach 1. Push all values into stack 2. Pop and rewrite list ⏱ TC: O(2N) 📦 SC: O(N) 3️⃣ Three Pointer Approach (Optimal) 1. We use: previous, current, nextnode 2. We reverse links one by one while traversing. ⏱ TC: O(N) 📦 SC: O(1) This is the most interview-preferred solution. 4️⃣ Recursion Approach 1. Recursively reverse the remaining list 2. Adjust pointers while returning Elegant and clean, but uses recursion stack. ⏱ TC: O(N) 📦 SC: O(N) (due to recursion stack) This video helps you understand the problem from beginner level to optimal solution level. 🔗 Stay connected with me: LinkedIn:   / asmitamhetre3183   LeetCode: https://leetcode.com/u/asmita3183/ 👉 Don’t forget to like, share, and subscribe. Your feedback means a lot! 🙌 #LeetCode #LeetCode206 #ReverseLinkedList #LinkedList #DSA #CodingInterview #ProblemSolving #CPlusPlus #Recursion #TwoPointers