Hello, this is very useful, and I think it would be awesome to link to this on https://mirror.codeforces.com/help because that is where everyone used to look for this kind of information.

Other than that, I would politely ask for an increase in Ruby's stack size. Since a long time ago, Ruby's stack size has been bounded with the environment variable RUBY_THREAD_VM_STACK_SIZE. The default value is seemingly 1MiB, so using recursion in Ruby is a pain in the arse almost everywhere. By setting this environment variable (i.e. export RUBY_THREAD_VM_STACK_SIZE=268435456) this can be fixed. I hope you could consider this suggestion seriously.

Hello. May I ask when will C++20 be supported on Polygon? Sometimes I find out that testers write C++20 code but when added the solution to Polygon, I need to convert some of them manually.

Perl is seriously out of date (the latest stable is v5.38). It is useful for regex-heavy problems, and it's really inconvenient if we want to use modern features (like signatures, etc.). Please consider upgrading Perl.

for java 21 , use

javac --release 21 --enable-preview

Thank you, this is very useful.

I have one question though, why -O2 instead of -O3? Does -O3 give some kind of unfair advantage to C/C++ folks?

Hi, thanks for the list! I'm wondering what's the status of F#? It was available at one time (https://mirror.codeforces.com/blog/entry/79), but looking at other old posts (https://mirror.codeforces.com/blog/entry/23311), it somehow disappeared. In terms of performance, it can be as fast as C#, so I believe it's more relevant to competitive programming than e.g. PHP and JavaScript.

Node.JS is really out-of-date, the latest is 20.8.0 and 21 is releasing soon. Please consider upgrade it, thanks!

I wonder if it is possible to "open" the process of language updates. Creating API for community to create their own runners (personal), and than have community vote to promote certain runners to "allowed in competition" level.

Docker comes to mind as most universal solution, but really any way to implement and "pack" a runner by community would be ok.

Recent changes:

• 2023-11-10: Node.js upgraded to 15.8.0 64-bit
• 2023-11-10: Free Pascal 3.0.2 upgraded to 3.2.2

Recent changes:

• 2023-12-30 Python 3.8.10 upgraded to 3.12.1
• 2023-12-30 Rust 1.72.0 upgraded to 1.75.0

Can we ask for updates to some compiler versions?

I want to practice OCaml with CF.

However, the OCaml version extremely outdated (4.02 instead of 5.x) and lacking basic primitives like List.init.

Thanks in advance!

C++ 23

Hi! Can we get support for Common Lisp as well? There was a blog where a comment explains how to add it (and there is a relevant PR on the GitHub repo too).

Recent changes:

• 2024-01-05 Python 3.12.1 reverted to 3.8.10

64-bit C compiler when?

Recent changes:

• 2024-01-16 Kotlin 1.9.21 added
• 2024-01-16 Kotlin 1.6.10 removed
• 2024-01-16 Java 1.8.0 removed

"Pypy3.10" has been released for a while now, and there are lot of useful Python 3.10 features. When are we getting the upgrade?

can you update the ocaml compiler?

Please consider adding support for Lua language.

hi @Vladosiya

Any chance to add J support here? There is one for testing purposes. When having script.ijs one can invoke it like this:

cat input.txt | /Applications/j9.5/bin/jconsole script.ijs

Thanks and cheers, Pawel

Could you add scala 3 pls?

Recent changes:

• 2024-22-04 PyPy 3.9.10 (7.3.9, 64bit) upgraded to PyPy 3.10 (7.3.15 64bit)
• 2024-22-04 Go 1.19.5 upgraded to Go 1.22.2

Please consider upgrade to C#12, thanks!

Hi! Could you please consider incorporating Lua as an interpreted language? Lua is a combination of flexibility, efficiency, simplicity and portability. It consists of only four files, totaling 374.0 kB, and is really powerful. Here are some interpreter options I would recommend:

LuJIT: https://luajit.org/install.html

Luvit: https://luvit.io/install.html

Lua: https://www.lua.org/download.html

Lua (binaries): https://sourceforge.net/projects/luabinaries/files/5.4.2/Tools%20Executables/

By downloading the binaries, you simply need to navigate to the folder where Lua is installed and run: lua54.exe file.lua (if your VM is windows)

Great, Go is updated

У вас Ruby стартует 450мсек, а в задаче лимит 500мсек. На случайном тесте сервер икает, и Time limit превышается.

https://mirror.codeforces.com/contest/16/submission/259850087

Can you please add F#?

I believe something is wrong with pure C compiler.

I ran the following code using "Custom invocation":

#include <stdio.h>
int main() {
    for (int i = 0; i < 1000000; i++) {
        char ch = (char)('a' + i % 26);
        printf("%c", ch);
//        putchar(ch);
    }
    return 0;
}

It takes 3500 ms on "GNU GCC C11 5.1.0" !

If I replace printf("%c") with putchar, then 0 ms time is reported.

It takes 72 ms on "GNU G++17 7.3.0" with either function (printf/putchar does not matter).

Recent changes:

• 2024-23-08 GNU G++23 14.2 (64 bit, msys 2) added

please update Rust compiler