Great news! The best c++ CLion ide is now free! Write under this post which ide you are using!
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Supported by
Always Visual Studio Code.
Sublime Text 3
Online IDE's
codechef online compiler :(
Vim of course.
Neovim (Neovide) with a small setup for competitive programming
vscode orz
CodeForces custom test.
Clion is now free, other IDE sucks
Does it have testing plugins with companion interaction?