Offline Coding Software c++ for School competition

I am a high-school student and I am participating in my first coding competition. I have been working with C++ and I need to find an offline IDE. I’m a big novice, so does anyone have a favorite IDE?
Thanks guys

I use Vim for editing and g++ for compiling. I found IDEs unnecessarily complex for Competitive coding. But, it boils down to personal liking.