Although these days I mostly use Sublime Text 3 for contests but I have started using CLion again only because of OpenGL (because of it's weird naming conventions). The latest version of CLion is very stable, fast and has great intellisense, autocompletion and other features you need. Debugging is a piece of cake too on CLion, you can either use its GUI or command line GDB to debug. CMake only makes it better. But it sucks up ram quite easily.

Vim. Not an IDE per se, but you can definitely extend it to act like one. E.g. add support for code completion, error messages, debugging.

Also I can only recommend cfparser.vim, which allow to download test cases, compile your program, run it with all test cases, and even submit it.

Visual Studio Code is suggested.
- Clean and lightweight.
- Friendly interface.
- Powerful debugging.
- Integrated terminal.
- Integrated Git.
- All kinds of extensions.

It is really the best IDE I've ever seen.

One word — vim. I've been using it for almost 4 years now.

Mostly because I don't know how to exit

Can I get your thoughts about why you don't like CodeBlocks?

P.S. I also use CodeBlocks 16.01 and find it very friendly and comfortable in coding and debugging process.

Codeforces's custom test coz i'm lazy :/

You can use Far-Manager. Far-Manager is comfortable program for programming and debugging. It has many good functions. On Far-Manager you can generate tests for code. You can govern computer with Far-Manager. As I know you can download Far-Manager for those operating systems: UBUNTU, WINDOWS.

Intellij IDEA

CodeLite is a good IDE, it resembles CodeBlocks but feels better.

Am I the only notepad++ fan here? In my opinion it's by far the best editor I've ever used.

I use Microsoft Visual Studio 2017. It can test and debug. You can use Dev-C++ too. It is also a good IDE.

You can use :

1) Netbeans with MinGW

2) Eclipse CDT

3) Sublime Text with competitive programming setup -->see here

4)CLion (free for students)

CodeLite. It is free and open source and light-weight and cross-platform and supports C,C++,PHP and Node.js(just like codeblocks), and it has updates frequently (as for codeblocks , it has not had updates for years) , so it supports new standards (for example , c++17 code-completion features) while codeblocks doesn't. (BTW, you can use it as a editor for other languages , because it supports code highlighting for countless languages) I've used both codeblocks and codelite , and I think codelite is more "considerate". For example , it has pre-installed stl_printer for gdb (so that you can see inside STL templates while debugging), and its code-completion & code-highlighting & parentheses-matching&... are smarter. Try it out ,and you will see. The only problem is that, there isn't much introduction about using it on the internet(in my native language) , so it may be extremely difficult to use at the beginning.

upd: I use codelite on 64-bit windows , and it seems that the only c++ compilers which codelite supports perfectly , are mingw64 compilers. As for others , you can't debug STL with them . :(

Eclipse CDT is great in general. For competitive programming the simpler the better: so Code::Blocks, and debug using cout/cerr

tourist would to use Far Manager as C++ IDE

Sublime Text for coding and tracing. For complex debugging, I use Visual Studio code linked to GDB.

My favourite IDE is Geany. It's simple and doesn't have many features, but I like using it in competitive programming. It also supports many languages. There is autocompletion, but not very good. One of the good feature is snippets that can be used to autocomplete some language constructs. E. g. if for + <Tab> is typed, the code will be expanded into something like this:

for (int i = 0; i < |; i++) {

}

For debugging and testing I don't use any special things.

Atom

DEV c++ The most widely used IDE in China. And I like it.

Dev C++

I am using Clion compiler form Jetbrains Company . It compiles graphics programs . but id doesn't work on windows 32-bit OS . Good Luck At the ACM .

Dev-c++

Absolutely Dev c++! I like dev!

I'm using CP Editor now.

I can't say it's already better than Dev-C++, but by using it, I can make feature requests and find bugs, or even fix them by myself. I believe one day it will be awesome for competitive programmers.