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 10A
To advance to the next level, you need to solve all problems.
Cartesian tree with implicit key
Theory on e-maxx
Theory on habr
I think a lot of other things are easily searched for on the Internet
Advanced number theory, Chinese remainder theorem
See the theory on e-maxx:
extended Euclidean algorithm,
inverse by simple modulus,
linear diophantine equations,
linear equation by modulo
Chinese remainder theorem.
Inclusion-exclusion formula
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