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Awesome Algorithms

A curated list of awesome places to learn and/or practice algorithms. Inspired by awesome-awesomeness and all the other awesome Awesome libraries.

If you want to contribute, please read the contribution guidelines.

Websites

Websites you should use to learn classic algorithms

Online Courses

Free and High Quality Courses Online

Books

The most highly regarded books to learn algorithms

Github Libraries

Implementations of the most classic algorithms in a wide variety of programming languages

Online Judges

Online Judges to practice what you learned above

  • A2 Online Judge - Online Judge and problem archive.
  • ACM-ICPC Live Archive - Hundreds of problems from previous ACM-ICPC Regionals and World Finals.
  • AIZU ONLINE JUDGE - Japanese Online Judge.
  • CS Academy - Holds online contests and IOI practice contests
  • CodeChef - More problems and monthly online contests.
  • Codeforces - The only programming contests Web 2.0 platform
  • CodeMarshal - Real world contests online!
  • CodeWars - A website that houses support to solve algorithms in many languages in varying difficulty.
  • CoderByte - A decent website with algorithm challenges from beginner to advanced levels. Supports most of the popular languages like C++, python, javascript, ruby.
  • HackerEarth - Practice alogrithmic problems & challenges and participate in hiring challenges.
  • HackerRank - Featured algorithm and functional programming online judges
  • Infoarena - Romanian Online Judge. 1500+ algorithmic problems
  • Kattis- Online judge and problem archive
  • LavidaOnlineJudge - Korean Online Judge(Half English). 1300+ problems.
  • Learneroo Algorithms Tutorials - Learn and practice algorithms by solving challenges online.
  • LeetCode - Learn algorithms and prepare for interviews.
  • PKU JudgeOnline - Chinese Online Judge.
  • ProjectEuler - Mathematical problems that can be solved using algorithms (or just a pencil, depends on how much you already know).
  • Rosalind - A platform for learning bioinformatics and programming through problem solving.
  • ShareCode.io - Online Judge and contest host with a lot of algorithmic problems in the archive to practice.
  • Snakify - An introductory Python course with 100+ algorithmic problems and a step-by-step debugger (from Russia).
  • SPOJ - More problems.
  • TopCoder - Lots of problems and real world/money worthy problems in Graphic Design, Data Science and Development.
  • Toph - Sport programming platform for online contests. It also has a growing problem archive.
  • URI - Brazilian Online Judge. Not so much problems, but it's growing and it has online contests.
  • UVA - Hundreds of problems (from previous ACM-ICPC Regionals, World Finals and others).

Tools

Some tools that can help you in the learning of algorithms

License

And for the sake of copyleft, here's our license:

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.