⚡ Part 2: C++ Foundations
Master the building blocks of competitive programming in C++. From your first "Hello World" to functions and arrays.
📚 3 Chapters · ⏱️ Estimated 1-2 weeks · 🎯 Target: Write and compile C++ programs
Part 2: C++ Foundations
Before you can solve algorithmic problems, you need to speak the language. Part 2 is your crash course in C++ — from the very first program to functions, arrays, and vectors. You'll build the foundational skills needed for all later chapters.
What You'll Learn
| Chapter | Topic | Key Skills |
|---|---|---|
| Chapter 2.1 | Your First C++ Program | Variables, input/output, compilation |
| Chapter 2.2 | Control Flow | if/else, loops, break/continue |
| Chapter 2.3 | Functions & Arrays | Reusable code, arrays, vectors |
Why C++?
Competitive programmers overwhelmingly choose C++ for two reasons:
- Speed — C++ programs run faster than Python or Java, which matters when you have tight time limits (typically 1–2 seconds for up to 10^8 operations)
- The STL — C++'s Standard Template Library gives you ready-made implementations of nearly every data structure and algorithm you'll ever need
Note: USACO accepts C++, Java, and Python. But C++ is by far the most common choice among top competitors, and this book focuses on it exclusively.
Tips for Part 2
- Type the code yourself. Don't copy-paste. Your fingers need to learn the syntax.
- Break things. Deliberately introduce errors and see what happens. Reading compiler errors is a skill.
- Run every example. Seeing output appear on screen cements understanding far better than just reading.
Let's dive in!