I released an atom plugin, codeblue, a week ago which was only supporting python to test and run code. You can also submit the solution from within the atom.

BUT NOW IT SUPPORTS C and C++ too. Go ahead and download the package from the install tab of atom settings.

To learn more about its features and capabilities: https://mirror.codeforces.com/blog/entry/81753

Github repo: https://github.com/blueedgetechno/codeblue

watch the gif: https://gifyu.com/image/cGq8