Skill Topic · Cinematic

📘 DSA — Queues

Queue — FIFO (First In First Out) — line me lagne jaisa! 🚶‍♂️🚶‍♀️🚶

Overview

📘 DSA — Queues — Quick Facts

📌

Queue Concept: Hospital Analogy 🏥

🎯

Queue: Patients ki line — pehle aaya…

⚡

Enqueue: Naya patient line me peeche lagta…

🔑

Dequeue: Front waale patient ka number aata…

Topic 1

🎯 Real-World Analogy: Hospital OPD Counter 🏥🎫

📚 Queue ko hospital ke OPD counter ki tarah samjho — jo patient pehle aaya, uski pehle…

Topic 2

📌 1. Queue Kya Hai?

💡 🏥 Analogy: Queue = OPD ki line — patient peeche lagta hai (enqueue), doctor aage waale ko…

Topic 3

📌 2. Queue — Array Implementation

🎯 `javascript class Queue { constructor() { this.items = []; // OPD ki line }…

Topic 4

📌 3. Optimized Queue — Object Based O(1)

⭐ 🏥 Analogy: Token system — front/rear counter number track karo, patients physically shift…

Topic 5

📌 4. Queue — Linked List Implementation

🔑 `javascript class QueueNode { constructor(value) { this.value = value; this.next = null;…

Topic 6

📌 5. Circular Queue

✨ 🏥 Analogy: Token machine — 99 ke baad token 1 se phir start! Fixed capacity, memory…

Topic 7

📌 6. Priority Queue

🌟 🏥 Analogy: Emergency department — critical patient ko pehle dikhao, chahe wo baad me aaya…

Topic 8

📌 7. Deque (Double-Ended Queue)

🚀 🏥 Analogy: VIP + Normal line — VIP aage se bhi ja sakta, normal peeche lagta. Dono ends…

Topic 9

📌 8. Classic: Queue from 2 Stacks

📚 🏥 Analogy: 2 thaali ke dher se OPD line banao — ek dher incoming, doosra outgoing!…

Topic 10

📌 9. First Non-Repeating in Stream

💡 `javascript function firstNonRepeating(stream) { const queue = []; const freq = {}; const…

Topic 11

📌 10. Stack vs Queue

🎯 | Feature | Stack (LIFO) 🍽️ | Queue (FIFO) 🏥 | |---|---|---| | Order | Last In First Out…

Topic 12

📌 11. Real-World Applications

⭐ | Use Case | Queue Kaise 🏥 | |---|---| | 🖨️ Print Queue | Documents print order me | | 💻…

Topic 13

🚫 Common Mistakes

🔑 | # | Mistake ❌ | Correct Approach ✅ | Severity | |---|---|---|---| | 1 | Array shift()…

Topic 14

🏋️ Practice Exercises

✨ 🟢 Beginner: Queue Basics 1. Queue class banao (Array based) — enqueue, dequeue, front,…

Topic 15

📋 Summary Table

🌟 | Topic | Key Takeaway | |---|---| | FIFO | First In, First Out — OPD ki line | |…

Comparison

📌 10. Stack vs Queue

⚖️

Order: Last In First Out

⚖️

Add: push (top)

⚖️

Remove: pop (top)

Diagram

Visual Flow

📊 Diagram visualization — details in narration

Diagram

Visual Flow

📊 Diagram visualization — details in narration

Quick Quiz

Quiz — Question 1

📘 DSA — Queues ka sabse sahi definition kya hai?

Quick Quiz

Quiz — Question 2

📘 DSA — Queues ka 'Queue' kya hai?

Complete! 🎉

📘 DSA — Queues Complete!

Aliens School · HIEN · Cinematic Knowledge

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