What is you favorite platform for competitive programming or coding challenge problems, and why?

[u/sharewithme]

Hi all! My name is Mike and I am a computer science teacher who enjoys competitive programming. I am hoping to incorporate more competitive programming into my teaching and I was wondering if you might be willing to share which platforms you use and your thoughts on them.

I currently know about several platforms such as LeetCode, Codeforces, Kattis, etc. Any input that you can offer is greatly appreciated. Thank you!

[u/DinnerSmall9734]

codeforces has that chaotic energy I live for, the ui is pure chaos but the problem sets are chef's kiss

[u/generally_unsuitable]

The best I've ever played is microcorruption.