Runtimes

Which compiler or interpreter runs each language, and which versions you can pick. Choose a version per language above the editor; both Run and Submit use it. ★ marks the default.

Python

Version	Exact	Command	Runs in
Python 3.13	CPython `3.13.16`	`python3.13 -S main.py`	server
Python 3.12 ★	CPython `3.12.15`	`python3.12 -S main.py`	Run: Pyodide 0.27.2 — CPython 3.12 in WebAssembly · Submit: server
Python 3.11	CPython `3.11.17`	`python3.11 -S main.py`	server
Python 3.9	CPython `3.9.25`	`python3.9 -S main.py`	server

JavaScript

Version	Exact	Command	Runs in
Node.js 24	Node.js (V8) `24.22.1`	`node main.cjs`	server
Node.js 22 ★	Node.js (V8) `22.23.4`	`node main.cjs`	Run: the browser's JavaScript engine · Submit: server
Node.js 20	Node.js (V8) `20.20.2`	`node main.cjs`	server

TypeScript

Version	Exact	Command	Runs in
TS · Node.js 24	sucrase → Node.js `24.22.1`	`sucrase main.ts → node main.cjs`	server
TS · Node.js 22 ★	sucrase → Node.js `22.23.4`	`sucrase main.ts → node main.cjs`	Run: types stripped by sucrase, then the browser engine · Submit: server
TS · Node.js 20	sucrase → Node.js `20.20.2`	`sucrase main.ts → node main.cjs`	server

Java

Version	Exact	Command	Runs in
Java 25	Amazon Corretto (OpenJDK) `25.0.5`	`javac Main.java → java Main`	server
Java 21 ★	Amazon Corretto (OpenJDK) `21.0.13`	`javac Main.java → java Main`	server
Java 17	Amazon Corretto (OpenJDK) `17.0.21`	`javac Main.java → java Main`	server

C#

Version	Exact	Command	Runs in
.NET 10 · C# 14	.NET SDK (Roslyn csc) `10.0.113`	`csc -optimize+ -langversion:latest → dotnet Main.dll`	server
.NET 8 · C# 12 ★	.NET SDK (Roslyn csc) `8.0.132`	`csc -optimize+ -langversion:latest → dotnet Main.dll`	server

C++

Version	Exact	Command	Runs in
GCC 14 · C++23	GCC (g++) `14.2.1`	`g++ -O2 -Wall -std=c++23 main.cpp`	server
GCC 14 · C++20	GCC (g++) `14.2.1`	`g++ -O2 -Wall -std=c++20 main.cpp`	server
GCC 11 · C++20 ★	GCC (g++) `11.5.0`	`g++ -O2 -Wall -std=c++20 main.cpp`	server
GCC 11 · C++17	GCC (g++) `11.5.0`	`g++ -O2 -Wall -std=c++17 main.cpp`	server
GCC 11 · C++14	GCC (g++) `11.5.0`	`g++ -O2 -Wall -std=c++14 main.cpp`	server

C

Version	Exact	Command	Runs in
GCC 14 · C23	GCC `14.2.1`	`gcc -O2 -Wall -std=c23 main.c -lm`	server
GCC 14 · C17	GCC `14.2.1`	`gcc -O2 -Wall -std=c17 main.c -lm`	server
GCC 11 · C17 ★	GCC `11.5.0`	`gcc -O2 -Wall -std=c17 main.c -lm`	server
GCC 11 · C11	GCC `11.5.0`	`gcc -O2 -Wall -std=c11 main.c -lm`	server
GCC 11 · C99	GCC `11.5.0`	`gcc -O2 -Wall -std=c99 main.c -lm`	server

Craykon

Version	Exact	Command	Runs in
Craykon 0.1 ★	@ttukttak/lang · @ttukttak/console `0.1.0`	`runConsole(main.cray)`	Run: @ttukttak/lang · Submit: server

With the default version, Run executes right in your browser (Python, JavaScript, TypeScript, Craykon) and Submit is always judged on the server with the same version. Pick another version and Run goes to the server too. The server is AWS Lambda (arm64, Amazon Linux 2023); time limits are 2 s for C/C++, 3 s for JavaScript/TypeScript and 4 s for the rest.