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As BOI 2021 is organized as an online competition only, contestants will have to set up their own hard- and software. For doing so, it may be relevant to know the programming language support of the BOI contest system:

LanguageStandard SuppportedCompiler used
C++C++ 17g++ 10.2.0
PythonPython 3.7.10pypy 7.3.4

Please take into account that Python support is experimental.