C++ Vector in 20 Minutes 🔥 | Practical Tutorial with Complete Code | DSA & Interviews

C++ Vector in 20 Minutes! 🔥 In this practical C++ Vector tutorial, we will learn C++ STL Vector from basics to interview-level concepts with complete code examples. Instead of only learning theory, we will actually write and run code to understand how Vector works, how to use its important functions, and how Vector is used in DSA and coding interviews. If you're preparing for DSA, LeetCode, coding interviews, placements, or learning C++ STL, this video is for you. 🚀 🔥 WHAT YOU WILL LEARN 00:00 – C++ Vector Introduction 00:50 – What is Vector? 02:00 – Array vs Vector 03:30 – Vector Declaration & Initialization 05:00 – Adding Elements with push_back() 06:30 – Removing Elements with pop_back() 07:30 – Accessing Vector Elements 08:30 – size() vs capacity() 10:00 – How push_back() Works Internally 12:00 – reserve() vs resize() 14:00 – Traversing a Vector 15:30 – Important Vector Functions 17:00 – Sorting & Searching a Vector 18:30 – Vector Time Complexity 19:30 – DSA & Coding Interview Tips 💻 PRACTICAL CODE COVERED ✅ vector(int) declaration ✅ Vector initialization ✅ push_back() ✅ pop_back() ✅ size() ✅ capacity() ✅ front() ✅ back() ✅ empty() ✅ clear() ✅ reserve() ✅ resize() ✅ Indexing ✅ Traversal using loops ✅ Range-based for loop ✅ Iterators ✅ Sorting ✅ Searching ✅ Practical DSA usage 🧠 IMPORTANT VECTOR CONCEPTS • What exactly is a Vector? • Array vs Vector • Dynamic Array • size() vs capacity() • What happens inside push_back()? • Vector memory allocation • Vector reallocation • reserve() vs resize() • Why Vector indexing is O(1) • Vector time complexity • Amortized O(1) push_back() 🎯 WHY SHOULD YOU LEARN VECTOR? Vector is one of the most frequently used containers in C++ DSA. You will see Vector regularly in: 🔥 LeetCode Problems 🔥 Coding Interviews 🔥 Competitive Programming 🔥 DSA Problems 🔥 Product-Based Company Interviews 🔥 Placement Coding Rounds After this video, you should be able to confidently create, modify, traverse and use a Vector in your DSA problems. 💡 INTERVIEW QUESTIONS YOU SHOULD BE ABLE TO ANSWER 👉 What is a Vector in C++? 👉 How is Vector different from an Array? 👉 What is the difference between size() and capacity()? 👉 What happens when push_back() exceeds capacity? 👉 Why is Vector indexing O(1)? 👉 What is the difference between reserve() and resize()? 👉 What is the time complexity of push_back()? 👉 When should you use Vector instead of an Array? 🚀 LEARN C++ STL → MASTER DSA → CRACK CODING INTERVIEWS This video is part of the C++ STL learning series on TheCodePathshala. Subscribe to TheCodePathshala for: ✅ C++ ✅ DSA ✅ C++ STL ✅ LeetCode ✅ Coding Interview Preparation ✅ System Design ✅ Software Engineering Concepts If this video helped you understand C++ Vector, LIKE 👍 the video and SUBSCRIBE 🔔 to TheCodePathshala. Comment below: What should we cover next in the C++ STL series? #CPP #CPlusPlus #STL #Vector #DSA #CodingInterview #CPPSTL #LeetCode #Programming #DataStructures 🔎 YouTube Tags c++ vector c++ vector tutorial c++ vector practical c++ vector practical tutorial c++ vector with code c++ vector complete code c++ vector explained vector in c++ vector in c++ stl c++ stl vector c++ stl vector stl c++ vector in 20 minutes c++ vector 20 minutes learn c++ vector c++ vector for dsa vector for dsa c++ dsa c++ data structures c++ coding interview c++ interview preparation vector interview questions c++ stl interview questions vector vs array array vs vector c++ size vs capacity c++ vector size capacity push_back c++ push_back vector reserve vs resize c++ vector reserve vector resize vector functions vector time complexity vector indexing c++ programming learn c++ c++ tutorial c++ beginners dsa interview preparation leetcode c++ coding interview preparation placement preparation stl tutorial stl for dsa #️⃣ Hashtags #CPP #CPlusPlus #STL #Vector #DSA #CodingInterview #CPPSTL #LeetCode #Programming #DataStructures