Skill Topic · Cinematic

📘 DSA — Doubly Linked List

Doubly Linked List — dono taraf navigate karo, forward aur backward! ↔️

Overview

📘 DSA — Doubly Linked List — Quick Facts

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DLL Concept: Bus Route Analogy 🚌

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Node: Bus stop — naam (data) + aagla…

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prev pointer: Pichle stop ka raasta — reverse…

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next pointer: Agle stop ka raasta — forward…

Topic 1

🎯 Real-World Analogy: Double-Decker Bus Route 🚌🔄

📚 Doubly Linked List ko Double-Decker Bus Route ki tarah samjho — har bus stop (node) se…

Topic 2

📌 1. Singly vs Doubly Linked List

💡 🚌 Analogy: Singly = One-way bus (sirf aage jaao). Doubly = Two-way bus (aage BHI peeche…

Topic 3

📌 2. Node Class

🎯 `javascript // Bus Stop = Doubly Node class DoublyNode { constructor(value) { this.value…

Topic 4

📌 3. Doubly Linked List — Full Implementation

⭐ 🚌 Analogy: Bus Route Manager — stops add/remove karo, route reverse karo,…

Topic 5

📌 4. Usage Example

🔑 `javascript const route = new DoublyLinkedList(); route.append("Anand Vihar"); // null ⇄…

Topic 6

📌 5. Insert & Delete — Mermaid Visual

✨ `mermaid graph TD subgraph "Insert at Index 2 (value: C)" I1["Before: null ⇄ A ⇄ B ⇄ D ⇄…

Topic 7

📌 6. LRU Cache — Interview Classic!

🌟 🚌 Analogy: Limited parking slots — recently used bus pehle, least used bus nikalo!…

Topic 8

📌 7. Real-World Uses

🚀 | Use Case | How DLL Helps 🚌 | |---|---| | 🌐 Browser History | Back (prev) / Forward…

Topic 9

🚫 Common Mistakes

📚 | # | Mistake ❌ | Correct Approach ✅ | Severity | |---|---|---|---| | 1 | Insert me…

Topic 10

🏋️ Practice Exercises

💡 🟢 Beginner: Build DLL 1. DoublyLinkedList class banao — prepend, append, printForward,…

Topic 11

📋 Summary Table

🎯 | Topic | Key Takeaway | |---|---| | Node | { value, prev, next } — bidirectional | |…

Comparison

📌 1. Singly vs Doubly Linked List

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Structure: { value, next }

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Direction: Sirf forward →

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Insert at Start: O(1) ✅

Diagram

Visual Flow

📊 Diagram visualization — details in narration

Diagram

Visual Flow

📊 Diagram visualization — details in narration

Quick Quiz

Quiz — Question 1

📘 DSA — Doubly Linked List ka sabse sahi definition kya hai?

Quick Quiz

Quiz — Question 2

📘 DSA — Doubly Linked List ka 'Node' kya hai?

Complete! 🎉

📘 DSA — Doubly Linked List Complete!

Aliens School · HIEN · Cinematic Knowledge

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