Learning set, unordered_set, and priority_queue in C++

When to Use Which STL Container (Interview Thinking) While learning C++ STL, three containers often appear in interview problems: set unordered_set priority_queue They may look similar at first, but each solves different problem types. This article explains how they work, their complexities, and when to choose each one. 1️⃣ set — Unique + Sorted Data What it does Stores unique elements Maintains sorted order Implemented using a self-balancing BST (Red-Black Tree) Example set<