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# 🚀 Awesome Competitive Programming Resources

## 🌟 Top Resources for Competitive Programming & Algorithmic Programming Ecosystem

**Curated List of Platforms, Tools, Books, Courses & Open-Source Projects**  
*Focused on Algorithms, Data Structures, Problem Solving, DSA & Contest Preparation*  
**Last updated: May 2026**

---

This repository is a comprehensive guide to the **best resources for competitive programming** and algorithmic problem-solving. It covers everything from beginner foundations to advanced topics like dynamic programming, graph algorithms, number theory, and contest strategies. These resources help you master **Data Structures and Algorithms (DSA)**, optimize solutions, participate in contests (**Codeforces, AtCoder, ICPC, IOI**, etc.), and prepare for technical interviews at top tech companies.

**Examples** include legendary lists like lnishan's Awesome Competitive Programming, CSES Problem Set, CP-Algorithms, USACO Guide, and code libraries from top competitors. The focus is on practical, high-quality materials with strong community support and proven results in IOI, ICPC, and major online judges.

**Open-source emphasis**: This section is heavily expanded with GitHub repositories containing algorithm implementations, templates, training repos, and full competitive programming toolkits for self-study and customization.

✨ Contributions welcome! Open a PR to add/update entries. Keep descriptions factual and link to official sites.

---

## 📖 Table of Contents
- [🎯 Core Platforms & Practice Sites](#core-platforms--practice-sites)
- [📚 Books & Handbooks](#books--handbooks)
- [🎓 Courses & Tutorials](#courses--tutorials)
- [💻 Open-Source GitHub Projects & Libraries](#open-source-github-projects)
- [🤝 How to Contribute](#how-to-contribute)
- [⚖️ Disclaimer](#disclaimer)

## 🎯 Core Platforms & Practice Sites

### 🏆 Major Online Judges & Contest Platforms

- **[Codeforces](https://codeforces.com/)** 🟦  
  The most popular competitive programming platform with frequent rated contests (Div. 1–4), virtual contests, and a strong rating system. Excellent for all levels with rich editorials and blogs.

- **[AtCoder](https://atcoder.jp/)** 🇯🇵  
  High-quality contests with clean problems. Great for beginners (ABC) to experts (ARC/AGC). Strong focus on innovative algorithmic challenges.

- **[CodeChef](https://www.codechef.com/)** 👨‍🍳  
  Monthly long challenges, cook-offs, and starters. Excellent for learning through editorials and community discussion.

- **[LeetCode](https://leetcode.com/)** 💻  
  Best for **coding interview preparation** with curated problem lists, company-tagged questions, and mock interviews.

- **[CSES Problem Set](https://cses.fi/problemset/)** 🇫🇮  
  400+ high-quality problems with increasing difficulty. Paired perfectly with the Competitive Programmer's Handbook.

- **[SPOJ](https://www.spoj.com/)** 🌐  
  Classic judge with thousands of problems and classic algorithmic challenges.

- **[TopCoder](https://www.topcoder.com/)** 🔝  
  SRM contests and algorithm-focused challenges with strong educational resources.

- **[Kattis](https://open.kattis.com/)** 🐱  
  A problem archive and contest platform used by many universities and world-class competitions like ICPC.

- **[UVa Online Judge](https://onlinejudge.org/)** 🏛️  
  A historic archive with thousands of problems. Best used alongside **[uHunt](https://uhunt.onlinejudge.org/)** for structured learning.

- **[Timus Online Judge](https://acm.timus.ru/)** 🇷🇺  
  Large Russian archive of problems, often featuring high-quality challenges from Ural Federal University contests.

- **[CS Academy](https://csacademy.com/)** 🏫  
  Online judge with interactive lessons, regular contests, and a powerful graph visualizer.

- **[Virtual Judge (VJudge)](https://vjudge.net/)** 🔄  
  Allows creating custom contests by pulling problems from multiple online judges (Codeforces, SPOJ, UVa, etc.).

**Other notable platforms**: HackerRank, HackerEarth, Meta Hacker Cup, Google Kickstart, USACO, Project Euler, HDU OJ, Aizu Online Judge.

## 📚 Books & Handbooks

- **[Competitive Programmer's Handbook](https://cses.fi/book/book.pdf)** by Antti Laaksonen 📘 — Free, comprehensive, and highly recommended starting point.
- **[Competitive Programming 4](https://cpbook.net/)** by Steven & Felix Halim 📖 — The "bible" of CP with extensive problem sets and historical contest context.
- **[Guide to Competitive Programming](https://link.springer.com/book/10.1007/978-3-030-39357-1)** by Antti Laaksonen 📗 — A more formal textbook based on the CSES project.
- **[The Algorithm Design Manual](http://www.algorist.com/)** by Steven Skiena 📙 — Excellent for understanding how to apply algorithms to real-world problems and contests.
- **[Programming Challenges](https://www.amazon.com/Programming-Challenges-Contest-Training-Computer/dp/0387001638)** by Skiena & Revilla 📕 — A classic training manual for competitive programming.
- **[Algorithmic Thinking](https://nostarch.com/algorithmic-thinking)** by Daniel Zingaro 📓 — Teaches algorithms through the lens of CP problems (IOI, USACO).
- **[Introduction to Algorithms (CLRS)](https://mitpress.mit.edu/9780262046305/)** 📚 — The foundational academic reference for algorithm theory.
- **[Algorithms](https://algs4.cs.princeton.edu/home/)** by Robert Sedgewick & Kevin Wayne ☕ — Focused on implementation and visualization, particularly strong for Java users.
- **[The Hitchhiker's Guide to the Programming Contests](https://comscigate.com/Books/contests/icpc.pdf)** 👽 — A free, community-driven book covering a wide range of CP topics.

## 🎓 Courses & Tutorials

### 🔗 Best Tutorial Sites
- **[CP-Algorithms](https://cp-algorithms.com/)** 💎 — Gold standard for in-depth algorithm explanations (English version of e-maxx).
- **[USACO Guide](https://usaco.guide/)** 🐄 — Structured modules from Bronze to Platinum with problems and editorials.
- **[OI Wiki](https://oi-wiki.org/)** 🇨🇳 — Comprehensive, open-source guide for competitive programmers (available in Chinese and English).
- **[Mostafa Saad's Training Sheet](https://docs.google.com/spreadsheets/d/1iJZWP2nS_OB3kKw6188AUthhjWl7mlFZJ8W6S4M9no0/edit)** 📋 — A legendary problem set (~800 problems) for systematic training.
- **[GeeksforGeeks](https://www.geeksforgeeks.org/fundamentals-of-algorithms/)** 🤓 — Massive archive of articles and problem solutions.
- **[HackerEarth Practice](https://www.hackerearth.com/practice/)** 💻 — Features the "Code Monk" series for topic-wise learning.
- **[PEGWiki](https://wcipeg.com/wiki/)** 🎓 — In-depth, wiki-style writeups on many CP topics.
- **[Commonlounge CP Community](https://www.commonlounge.com/community/competitive-programming)** 🤝 — Curated tutorials and video content.

### 🎥 Video Courses & Channels
- **[Kunal Kushwaha's DSA Bootcamp](https://www.youtube.com/playlist?list=PL9gnSGHSqcnr_ZWDubPQXYuK9L8H6Lwde)** 📺 — Beginner-friendly Java-based algorithms series.
- **[Errichto](https://www.youtube.com/c/Errichto)**, **[William Lin](https://www.youtube.com/c/WilliamLin168)**, **[SecondThread](https://www.youtube.com/c/SecondThread)** 🏅 — High-level tips and screencasts from top Codeforces competitors.
- **[Algorithms Live!](https://www.youtube.com/channel/UCN77O66Kst0YAL_Y9_72Gjw)** 🔴 — Deep dives into advanced algorithmic topics.
- **[Stanford CS 97SI](https://web.stanford.edu/class/cs97si/)** 🌲 — Lecture slides and problems from Stanford's CP course.
- **[ITMO edX Course](https://www.edx.org/course/how-win-coding-competitions-secrets-itmo-universityx-i2cpx-0)** 🎓 — "How to Win Coding Competitions" by the world-renowned ITMO University.
- **[Reykjavik T-414-ÁFLV](https://github.com/SuprDewd/T-414-AFLV)** 🇮🇸 — High-quality slides and practice problems from a university-level CP course.

## 💻 Open-Source GitHub Projects

### 🛠️ Dedicated Algorithm Libraries & Templates

- **[lnishan/awesome-competitive-programming](https://github.com/lnishan/awesome-competitive-programming)** 🌟  
  The most comprehensive curated list of CP resources, books, tutorials, blogs, and tools collected over years.

- **[jnikhilreddy/Competitive-programming-resources](https://github.com/jnikhilreddy/Competitive-programming-resources)** 📚  
  A highly organized repository tailored for ACM-ICPC preparation, featuring lecture slides, problem sets, and algorithm implementations.

- **[atcoder/ac-library](https://github.com/atcoder/ac-library)** ⚡  
  The official AtCoder Library (ACL). Provides industry-standard, highly optimized implementations of segment trees, DSU, max flow, and more.

- **[kunal-kushwaha/Competitive-Programming-Resources](https://github.com/kunal-kushwaha/Competitive-Programming-Resources)** 🛠️  
  Curated video tutorials, problem lists, books, and system design resources for CP and interview prep.

- **[Ahmedtronic/Competitive-Programming](https://github.com/Ahmedtronic/Competitive-Programming)** 🗺️  
  A structured roadmap breaking down CP into levels mapped to Codeforces rating targets.

### 📂 Implementation Repositories
- **[TheAlgorithms/C-Plus-Plus](https://github.com/TheAlgorithms/C-Plus-Plus)** 🇨🇵 — Massive collection of algorithm implementations, including a dedicated competitive programming section.
- **[indy256/codelibrary](https://github.com/indy256/codelibrary)** ☕ — Extensive collection of algorithm implementations in Java and C++ by Andrey Naumenko.
- **[kth-competitive-programming/kactl](https://github.com/kth-competitive-programming/kactl)** 📜 — Highly optimized and tested team notebook (team reference manual) from KTH Royal Institute of Technology.
- **[cp-algorithms implementations](https://github.com/cp-algorithms/cp-algorithms)** 💻 — C++ code accompanying the famous CP-Algorithms website.
- **[usaco-guide solutions](https://github.com/usaco-guide/usaco-guide)** 🐄 — Community solution repos for USACO problems.
- **[tourist (Gennady Korotkevich) templates](https://github.com/search?q=user%3Atourist+template)** 🥇 — Explore the coding style and templates of the world's #1 competitive programmer.

### 🔍 Additional Strong Open-Source Options
- **[kenkoooo/AtCoderProblems](https://github.com/kenkoooo/AtCoderProblems)** 📈 — Source code for the essential AtCoder visualization and recommendation tool.
- **[cpeditor/cpeditor](https://github.com/cpeditor/cpeditor)** ⌨️ — The most popular specialized IDE designed specifically for competitive programming.
- **[VisuAlgo](https://visualgo.net/en)** 🎨 — Interactive visualization tools for algorithms and data structures.
- **[OEIS (Online Encyclopedia of Integer Sequences)](https://oeis.org/)** 🔢 — Invaluable for identifying mathematical patterns in combinatorics and number theory problems.

---

**🔧 Frameworks & Tools**: Use **CP Editor**, **Competitive Companion** (browser extension), and **VS Code with CP setups**. Combine with **GitHub** for version-controlled personal template libraries. Use **Big-O Cheatsheet** for quick complexity references.

## 🤝 How to Contribute

1. **Fork** the repo.
2. **Add/edit** entries in `README.md` (follow existing format).
3. **Include**: name, link, 1–2 sentence description, and level (beginner/intermediate/advanced).
4. **Submit PR** with a short explanation.

⭐ Star the repo if you find it useful!

## ⚖️ Disclaimer

- This is a **community-curated** list — not exhaustive and not an endorsement.
- Consistent practice, reading editorials, and upsolving are more important than collecting resources. Focus on quality over quantity.
- Competitive programming is for learning and fun. Avoid stress and maintain a healthy balance.

---

**Made with ❤️ for competitive programmers, ICPC/IOI aspirants, interview prep students, and algorithm enthusiasts.**

## 📈 Star History

---
**Keywords:** Competitive Programming, Algorithms, Data Structures, DSA, Coding Interview, ICPC, IOI, Codeforces, LeetCode, AtCoder, Problem Solving, C++, Python, Java, Programming Contest, Algorithm Templates.

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