CODER SK on Instagram: "Why does push_back() in C++ vector sometimes feel slow? This happens because of vector reallocation. In this video, I explain: • What vector reallocation is • Why push_back() is usually O(1) but sometimes O(n) • How C++ vectors grow internally • When to use reserve() for better performance If you are learning C++ STL, data structures, or preparing for interviews, this concept is a must-know. Save this for revision 🔖 . . #foryou #codingreels #new #techcontent #softwareeng