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- Luogu May be the OJ with the most active users in China.
- LiberOJ As the name suggests, this is a liberty OJ.
- DarkBZOJ
- Sphere online judge An online judge system with over 315,000 registered users and over 20,000 problems. Supports over 40 programming languages.
- Universal Online Judge
- UVa Online Judge An online automated judge for programming problems hosted by University of Valladolid.
- AtCoder A famous OJ in Japan.
- HDU Online Judge HDOJ is the most famous OJ in China. It has been open since 2005, and has a lot more contest problems compared to others.
- Codeforces A website that hosts competitive programming contests. Holds many contests every week, and contestants are ranked based their performance. Recommended by many universities.
- PKU JudgeOnline PKU JudgeOnline contains more than 3,000 interesting programming questions, most of which come from ACM and various self-organized competitions.
We all know that the main language used in OI competitions is C++, so it is very important to have a handy IDE.
- Vim Vim is a highly configurable text editor built to make creating and changing any kind of text very efficient. It is included as "vi" with most UNIX systems and with Apple OS X.
- Visual Studio Code Visual Studio Code is a lightweight but powerful source code editor which runs on your desktop and is available for Windows, macOS and Linux. It comes with built-in support for JavaScript, TypeScript and Node.
- Atom A hackable text editor for the 21st Century by Github.
- Eclipse Eclipse is a well-known cross-platform open source IDE.
- Dev C++ Dev-C++ is a free IDE for developing C/C++ (C++11).
- Notepad++ Notepad++ is a free source code editor and Notepad replacement that supports several languages. Running in the MS Windows environment, its use is governed by GNU General Public License.
- Xcode A well-known IDE running on Mac OS.
- Kate Kate is a Feature-Packed Text Editor.
- CLion A cross-platform IDE for C and C++.
- C++ Language It is a tutorial on the c++ official website.
- OI-Wiki Oi-Wiki introduces most of the C++ language knowledge required for OI.
- Competitive Programming, 2nd Edition Covers a collection of skills involved in ICPCs and IOIs.
- Advanced Guide of Algorithm Contest
- The Art of Algorithms and Olympics in Informatics A classic book for learning competitive programming. Outdated somehow.
- Introduction to Algorithms (CLRS) The "bible" for algorithms and data structures. The writing is rigorous and sometime hard to understand.
- Algorithms by Robert Sedgewick and Kevin Wayne
- Algorithms by Jeff Erickson