The software environment of CEOI 2025 consists of a virtual machine that runs Ubuntu Linux 24.04 LTS. The following packages are provided:
•    Compiler: GCC 14 in C++20 mode
•    Interpreters: Python 3.12 (for local testing only; solutions must be submitted in C++)
•    Text editors and IDEs: Vim, NeoVim, Geany, Kate, Kdevelop, Nano, Visual Studio Code, Eclipse, Emacs, Sublime
•    Debuggers: gdb, ddd, valgrind, visualvm
•    Web browsers: Firefox
Contest system
CEOI uses modified versions of the following software:
•    The CMS contest management system. 
•    The Task translation system from the IOI.