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 4A

To advance to the next level, you need to solve all problems.

Two pointers

Numeral systems. Binary system.

There is no theory here yet, you can search on the Internet (I found one, two). You need an understanding of how positional numeral systems works, and how to translate numbers from one system to another.

Bitwise operations

Theory: one, two, three. There are different programming languages everywhere, but the principle is the same, only the operation notation can be different.

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