Can you recommend a tutorial site on algorithms?

Question

Algorithms

About 8 years ago there was a site (now forgot) "task book" in Russian:

• Many algorithmic tasks divided into various topics and levels of complexity: finding the greatest common divisor and square roots, traversing a chessboard with a knight, forming sets according to conditions and initial data, numerical, etc. P.
  
• It was possible to programmatically implement the solution of the problem in a language convenient for oneself (10+ for sure, including c, c++, java, ...).
  
• Resources for the solution were limited (time, memory)
  
• The check was carried out by + -10 tests, the initial tests contained a pair of input-output data, the final ones did not give the desired output data, just an info that the test did not pass
  
• There were statistics for each task (it was clear that the new solution was faster than the previous one and it was nice to get into the top 20%)
  
• I don’t remember exactly, but there seemed to be a forum on tasks where they were discussed (links to articles on the topic were thrown), posting the solution directly was not encouraged
  

I understand that a lot of water has flowed under the bridge. But among such resources, which are currently popular and alive (possible in English)? If there is an inexpensive paid subscription - it does not matter.
I want to get out of my routine a little.

Thanks in advance.

Answer 1

Codewars.com has already been mentioned in the comments

• https://acmp.ru/
  
• https://leetcode.com/