Getting the most recent releases of gcc / g++ (11.0 or 10.2) on Ubuntu 20.04 LTS

I’d like to get the latest releases of g++ (and clang) via package manager (apt).
Currently I need to compile gcc/g++ on my own which needs really a lot of time.

Are there any repositories with "special packages" like g++-10-2, g++-11 or just g++-master?

I’d be really nice 🙂