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Codeforces (c) Copyright 2010-2024 Mike Mirzayanov
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My next article idea (which will probably be published in a month from now) is to make a tier list of online judges. But this isn’t gonna be just a baby tier list. I’ve made an insane number of accounts on different online judges, so this list will be as comprehensive as possible. Currently, I have the following list, and if you have any others to add, let me know. The only requirement is that the online judge must be in English.
I decided not to add sites like CSES or Yosupo Judge because they serve a different purpose than traditional online judges (e.g. CSES is a database of classical problems). I also might exclude interview prep sites like LeetCode since they also serve a different purpose, though I'm not sure at the moment.