Egypt seem to close their air space due to current situation in the region.

Those who are planning to attend Egypt for ICPC World Finals, be aware of this situation. Have no official references for the news by the moment, but it is better if someone recieve the news before departure.

Stay safe!

How to insert piece of code in polygon codeforces? Current manual points to the tag lstlisting, However this tag prevents compilation of PDF, while in Edit with preview mode it is displayed correctly. I am getting an error:

"! LaTeX Error: Environment lstlisting undefined."

Let's discuss problems.

What was your solution for problems E and J?

I'm interested in the next question:

How can I read string of 'char' without any whitespaces and line ends into 'string' in a most effective way (fastest way).

Note: it possible to read the array of 'char', but then I wouldn't know how much symbols I read.