Ten years ago, there were so many #OJ providing interesting and challenging problems, with a ugly, crude but clear UI.

I visited some today. Glad they didn't delete my accounts. But they applied advanced frontend tech to build a fancy UI, and filled the site with leetcode-easy-level problems and training courses.

Seems that #USACO is the only site that remained the legacy UI - it still works well in #w3m ! Well, it's domain has changed to usaco.training from http://train.usaco.org

#OI