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Stack in Data Structures and Algorithms (DSA) — complete beginner to interview-ready guide.

In this video we explain the *Stack* data structure in a simple and visual way. You’ll learn:
• What is a Stack (LIFO principle)
• Core operations: push, pop, peek/top, isEmpty, size
• Array-based vs Linked-list based stack implementation
• Time & Space Complexity of each operation
• Common applications: function call stack, expression evaluation, undo-redo, DFS
• Real interview problems and tips to solve them

Resources & Code Examples:
C++ Stack implementation: (paste code below)
Java Stack implementation: (paste code below)
Python Stack implementation: (paste code below)

Chapters (use timestamps below) for quick navigation.

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00:00 Introduction – What is a Stack?
00:45 LIFO Principle (Visual Explanation)
02:10 Stack Operations: push, pop, top/peek, isEmpty, size
04:00 Array-based Stack Implementation (concept)
05:30 Linked-list based Stack Implementation (concept)
07:10 Time Complexity of Stack Operations
08:20 Space Complexity & Memory Analysis
09:30 Common Applications of Stack (call stack, DFS, parentheses)
11:00 Example Problem 1: Balanced Parentheses
13:00 Example Problem 2: Next Greater Element (stack approach)
15:00 Tips for Interviews + Common Mistakes
16:00 Summary & Next Topics


#DSA #Stack #DataStructures #CodingInterview #Programming

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