English version is in beta. All contents of the site should be already translated (mostly using machine translation), and everything should work properly. However, if you find any problems, please contact me.
Level 2C
To advance to the next level, you need to solve at least half of the problems (except the contests marked with asterisk). When you solve them, I recommend that you move to the next level, so as not to delay the study of new theory. Return to the remaining tasks of this level later from time to time and try to gradually solve almost all of them.
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