c++

https://cppinsights.io/
https://gcc.godbolt.org/

Python

https://www.runoob.com/try/runcode.php?filename=HelloWorld&type=python3
https://www.nhooo.com/tool/python/

多语言

https://wandbox.org/
http://www.dooccn.com/cpp/
https://www.codechef.com/ide

https://www.pianshen.com/article/7694948559/