Free of adding the algorithm templates for codeforces, atcoder, oi/icpc etc.
You can easily add this plugin within your chosen plugin manager.
I take vim-plug for example:
Plug 'SirVer/ultisnips' " Required
let g:UltiSnipsExpandTrigger="<tab>" " Use TAB to implement
Plug 'TRSWNCA/Algorithm-Snippets' " Plugin here
Just after the plugin installed, you are allowed to use those snippets!
This repo will add the basic snippets (maybe less than 40 lines each), and some useful template (like adding the handle and date).
So if you want to expand the feature of this plugin, you can fork to your repo and pull request.
Anyway, I STRONGLY encourage you to fork and customize it.