Hi . I was looking for 2-sat problem for training and i found one ... but when i click on the tag , it says "Please, use a valid tag."
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Время на сервере: 21.04.2026 07:43:00 (f1).
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When I was blue for the first time I was able to change tags I'm not sure, but I think I had this possibility But now I can't do that Why?
You should be at least a div1 user to do that. ;)
It looks that it changed a few months ago, so now you have to be purple.
This bug was discusssed some time ago, but not fixed.
http://mirror.codeforces.com/blog/entry/15013
All still