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IMO if you are training for some onsite contest it's always good to train on whatever IDEs that contest allows, and in that case it's better not to use a template, or at least use a short one that you can quickly write at the beginning of the contest.

Otherwise I think Visual Studio is really nice (best debugger I've seen in the IDEs I've tried), not sure about templates because I don't use one.

Codeblocks easier to use, i recommend it. If you looking for defines search in codes of pros.

how you can speed up the writing of codes using the definition and all sorts of useful functions in C ++

From Google

wait... what?

I found that VS snippets are useful https://docs.microsoft.com/en-us/visualstudio/ide/code-snippets?view=vs-2017

You type # and first chars of snippet name (like #tie for cin.tie(0); cin.sync_with_stdio(false);), then press Tab, and code replaces it, with defined cursor position after replace.

one word: bitset

I'm currently using VSCode, and was developing an extension to compete easily in this editor. It is currently Work in Progress, but you can try it. Several features are missing, I plan to improve it soon! With your feedback I can make a better tool ;)

Find it in the marketplace as acmX. Marketplace or Github

I started using Vim, and even though looks really complex at the beginning, it is really nice end efficient. There are many plugins available and it is fully customizable. Once you learn the basic shortcuts, you won't ever use the arrow keys again!