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Skill Topic ยท Cinematic

๐Ÿ“˜ DSA โ€” Stacks

Stack โ€” LIFO (Last In First Out) โ€” thaaliyon ki tarah! ๐Ÿฅž

Overview
๐ŸŒŸ

๐Ÿ“˜ DSA โ€” Stacks โ€” Quick Facts

๐Ÿ“Œ

Stack Concept: Dhaba Analogy ๐Ÿฝ๏ธ

๐ŸŽฏ

Stack: Thaaliyon ka dher โ€” ek ke upar ek!

โšก

Push: Nayi thaali UPAR rakh do

๐Ÿ”‘

Pop: Sabse UPAR waali thaali nikalo

Topic 1
๐Ÿ“š

๐ŸŽฏ Real-World Analogy: Dhabe Ki Thaali Stack ๐Ÿฝ๏ธ๐Ÿฅž

๐Ÿ“š Stack ko dhabe me rakhee thaaliyon ki tarah samjho โ€” jo thaali sabse upar hai, wahi pehleโ€ฆ
Topic 2
๐Ÿ’ก

๐Ÿ“Œ 1. Stack Kya Hai?

๐Ÿ’ก ๐Ÿฝ๏ธ Analogy: Stack = thaaliyon ka dher โ€” push = upar rakh do, pop = upar se nikalo! Sabโ€ฆ
Topic 3
๐Ÿ”’

๐Ÿ“Œ 2. Stack Implementation โ€” Array

๐ŸŽฏ `javascript class Stack { constructor() { this.items = []; // Thaaliyon ka dher }โ€ฆ
Topic 4
โญ

๐Ÿ“Œ 3. Stack Implementation โ€” Linked List

โญ `javascript // Linked List se Stack โ€” array resize se bachao! class StackNode {โ€ฆ
Topic 5
๐Ÿ“ฅ ๐Ÿ“ฅ ๐Ÿง  ๐Ÿ”ฌ ๐Ÿ’ก ๐ŸŽฏ

๐Ÿ“Œ 4. Classic: Valid Parentheses

๐Ÿ”‘ ๐Ÿฝ๏ธ Analogy: Thaaliyon ke rang match karo โ€” har opening bracket ki matching closingโ€ฆ
Topic 6
โœจ ๐Ÿ“Š ๐Ÿ”ฌ

๐Ÿ“Œ 5. Reverse String Using Stack

โœจ `javascript // LIFO se last character pehle aata โ€” reverse! function reverseString(str) {โ€ฆ
Topic 7
๐Ÿ”’

๐Ÿ“Œ 6. Min Stack โ€” O(1) getMin

๐ŸŒŸ ๐Ÿฝ๏ธ Analogy: Do dher rakho โ€” ek normal, ek sirf minimums ka. Jab bhi poochho "sabse badiโ€ฆ
Topic 8
๐Ÿš€

๐Ÿ“Œ 7. Next Greater Element

๐Ÿš€ ๐Ÿฝ๏ธ Analogy: Har thaali ke liye "mujhse badi agle thaali kaun" dhundho! Monotonic stackโ€ฆ
Topic 9
๐Ÿ“ฅ ๐Ÿ“ฅ ๐Ÿง  ๐Ÿ”ฌ ๐Ÿ’ก ๐ŸŽฏ

๐Ÿ“Œ 8. Infix to Postfix

๐Ÿ“š ๐Ÿฝ๏ธ Analogy: Normal math (infix) ko calculator order (postfix) me convert karo โ€” stackโ€ฆ
Topic 10
๐Ÿ’ก ๐Ÿ“Š ๐Ÿ”ฌ

๐Ÿ“Œ 9. Evaluate Postfix

๐Ÿ’ก `javascript function evaluatePostfix(expression) { const stack = []; for (const char ofโ€ฆ
Topic 11
๐Ÿ“ฅ ๐Ÿ“ฅ ๐Ÿง  ๐Ÿ”ฌ ๐Ÿ’ก ๐ŸŽฏ

๐Ÿ“Œ 10. Real-World Uses

๐ŸŽฏ | Use Case | Stack Kaise Help Karta ๐Ÿฝ๏ธ | |---|---| | โ†ฉ๏ธ Undo/Redo | Ctrl+Z = pop lastโ€ฆ
Topic 12
๐Ÿ“ฅ โš™๏ธ ๐Ÿ”ฌ ๐Ÿ’ก

๐Ÿšซ Common Mistakes

โญ | # | Mistake โŒ | Correct Approach โœ… | Severity | |---|---|---|---| | 1 | Empty stack peโ€ฆ
Topic 13
๐Ÿ“ฅ ๐Ÿ“ฅ ๐Ÿง  ๐Ÿ”ฌ ๐Ÿ’ก ๐ŸŽฏ

๐Ÿ‹๏ธ Practice Exercises

๐Ÿ”‘ ๐ŸŸข Beginner: Stack Basics 1. Stack class banao (Array based) โ€” push, pop, peek, isEmpty 2.โ€ฆ
Topic 14
โœจ

๐Ÿ“‹ Summary Table

โœจ | Topic | Key Takeaway | |---|---| | LIFO | Last In, First Out โ€” thaali ka dher | |โ€ฆ
Diagram
๐Ÿ“ฅ โš™๏ธ ๐Ÿ”ฌ ๐Ÿ’ก

Visual Flow

๐Ÿ“Š Diagram visualization โ€” details in narration
Quick Quiz
๐Ÿง  QUIZ TIME

Quiz โ€” Question 1

๐Ÿ“˜ DSA โ€” Stacks ka sabse sahi definition kya hai?

Quick Quiz
๐Ÿง  QUIZ TIME

Quiz โ€” Question 2

๐Ÿ“˜ DSA โ€” Stacks ka 'Stack' kya hai?

Complete! ๐ŸŽ‰
COMPLETE

๐Ÿ“˜ DSA โ€” Stacks Complete!

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