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://codeforces.com/blog/entry/81753
Github repo: https://github.com/blueedgetechno/codeblue
watch the gif: https://gifyu.com/image/cGq8