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 1C

To advance to the next level, you need to solve at least half of the problems. 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.

Real numbers

If you haven't solved real numbers problems from level 1B yet, then read the theory there and solve all these problems. There are subtleties that you definitely need to know.

Problems


If you write in python, then you can use arrays in the first two advanced problems on loops — simply because otherwise you will not be able to count many numbers in one line.
The last two problems in "Advanced problems on real numbers" repeat the problems from just "Problems on real number" from level 1B. This is intended for those who have not solved level 1B; if you have solved a contest on real numbers at level 1B, then you do not need to solve these problems again.