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• Awesome-OI
  • Contents
  • Online Judges
    • OI mode
    • ICPC mode
  • C++ IDEs
    • List of Common C++ IDEs
  • C++ Basics
    • Standard Libraries
    • Learning Website of C++
  • Learning Resources
    • Books
      • General
      • Algorithm

• 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).
  • Orwell Dev-C++
  • Embarcadero Dev-Cpp
  • Red Panda Dev C++
• 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++.

• Standard C++ Library reference

• 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