3 C++ Projects I Built as a Junior High Student — Full Source Code on GitHub

#showdev #opensource #cpp #beginners

Hi everyone! My name is AlanWu. I'm an ordinary junior high school student in China, and I love coding in C++. I know my programming skills aren't perfect yet, but I believe sharing and getting feedback is the best way to grow. Here are three open-source C++ projects I built — feedback and contributions are always welcome!

Ping — A Lightweight ICMP Ping Tool

GitHub: https://github.com/Cn-Alanwu/Ping

Tech Stack: C++, Raw Sockets, ICMP Protocol

A simple local network ping program implemented from scratch using raw sockets and the ICMP protocol. Instead of just calling the system's built-in ping command, this project shows exactly how ping works under the hood — packet construction, checksum calculation, round-trip time measurement, and TTL handling.

Key Features:

Sends ICMP Echo Request packets and receives Echo Reply

Calculates RTT (round-trip time) in milliseconds

Supports configurable packet size and timeout

Clean, well-commented C++ code suitable for learning

Why It Matters: If you're learning network programming or socket APIs, reading a real implementation is far better than just reading theory. This project is small enough to understand in one sitting.

luogu-answer — Algorithm Problem Solutions for Luogu

GitHub: https://github.com/Cn-Alanwu/luogu-answer

Tech Stack: C++, Algorithms & Data Structures

A growing collection of reference answers (in C++) for algorithm problems on Luogu, one of China's largest online judge platforms for competitive programming. Each solution includes the problem ID and is ready to submit — just copy, paste, and it passes the judge.

Topics Covered:

Dynamic Programming

Graph Theory (DFS, BFS, shortest paths, MST)

Data Structures (segment tree, union-find, Fenwick tree)

Number Theory & Combinatorics

String Algorithms

Why It Matters: When you're stuck on a Luogu problem at 2 AM, having a clean reference solution to compare against is a lifesaver. This repo is my personal problem-solving journal — use it as a study companion.

algorithmCombination — Header-Only C++ Algorithm Library

GitHub:https://github.com/Cn-Alanwu/algorithmCombination

Tech Stack: C++ (Header-Only), Templates

A collection of commonly used algorithm and data structure templates, packaged as standalone header files with bilingual (Chinese + English) documentation. Header-only means zero configuration — just #include and start coding.

What's Inside:

Sorting algorithms (quick sort, merge sort, heap sort)

Graph algorithms (Dijkstra, Kruskal, Floyd-Warshall)

Math utilities (fast power, GCD/LCM, prime sieve)

Data structures (binary indexed tree, segment tree, disjoint set)

Why It Matters: In competitive programming, every second counts. Having battle-tested algorithm templates ready to go can be the difference between AC and TLE. The bilingual comments also make it friendly for both Chinese and English-speaking learners.

Wrapping Up

I built these projects because I genuinely enjoy writing code and solving problems. They're not perfect — I'm still learning, and I know there are bugs and room for improvement. If you find something wrong, please open an issue or even better, send a pull request. I'd love to learn from you.

If any of these projects help you even a little, a ⭐ on GitHub would mean a lot to me.

My GitHub: https://github.com/Cn-Alanwu

Tags: #cpp #github #opensource #programming #algorithms #networking #beginners #competitiveprogramming

中文版

大家好，我是AlanWu，一名普通的中国初中生，平时喜欢用 C++ 写代码。虽然我写的不算好，但我相信多分享、多接受反馈才能进步。以下是我写的三个 C++ 开源项目，欢迎大家提意见和 Pull Request！