stdfloat's blog

OI groups in CF
By stdfloat, 2 months ago, In English

In my country many sites are blocked.

Such as

Luckily Codeforces isn't blocked in my country, and I'm looking for OI groups on CF.

Such as

If you know such groups please comment it. It will be very helpful. And for some reasons I can't use vpn.

EDIT: Thanks Ambersand & _elliot_alderson, I can access to sites with Tor Browser now. It's a bit slow but it isn't a big problem.

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2 months ago, # |
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it will be good for me too

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    2 months ago, # ^ |
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    Me too!!!

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      11 days ago, # ^ |
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      try Kilonova (good,new Romanian OI-style problems website, has english translations for all problems, has a lot of contests and if I am not mistaken has really fast servers)

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2 months ago, # |
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https://www.acmicpc.net/

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2 months ago, # |
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is this one also blocked: https://olimpiada.ic.unicamp.br/ ? obs: it is in pt-br

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    2 months ago, # ^ |
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    No it's not blocked :). Which OIs does it have?

    Am I right?
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      2 months ago, # ^ |
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      Yep, it's the Brazillian Olympiad in Informatics (OBI in Portuguese) website. All problems there are OBI problems. For those who cannot access the official website or don't know Portuguese, there's this. Just search "OBI" on the search bar and most recent problems should show up.

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2 months ago, # |
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use V*N

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2 months ago, # |
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If you haven’t tried already, see if you can access https://qoj.ac/.

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2 months ago, # |
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Sad fact
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2 months ago, # |
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Try my country's online judge here

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2 months ago, # |
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Which country do you live in? It's weird that competitive programming sites would be blocked.

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6 weeks ago, # |
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Just move to another country, what's the problem?

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4 weeks ago, # |
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What the actual fuck is your government? Try https://f001.backblazeb2.com/file/geph4-dl/geph-releases/windows-stable/4.8.9/geph-windows-setup.exe

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4 weeks ago, # |
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https://www.luogu.com.cn/ Chinese website, has atcoder statements and some OI problems

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4 weeks ago, # |
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I think there are things common in all of them made it be blocked by your country.

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    4 weeks ago, # ^ |
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    idk, for example what?

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      4 weeks ago, # ^ |
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      I think the reason, maybe, the hosting provider of those websites, Cloudflare, for example, proxies that blocked by your country, etc..

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4 weeks ago, # |
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Did you try usaco.org?

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    4 weeks ago, # ^ |
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    Yes, but I didn't like the problems in it. I also tried train.usaco.org. I'm in section 4.1.

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2 weeks ago, # |
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Shaazzz

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    2 weeks ago, # ^ |
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    What is Shaazzz? What does it have?

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      2 weeks ago, # ^ |
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      The gold medalists of INOI lead a group that helps people prepare for the INOI each year. They provide many OI-style, combinations, and graph problems. Shaazzz, their website, has useful blogs. and you can also use Shaazzz quide but they may need to be translated. Quera also has INOI final exam problems and OI-style problems, but they may require translation as well.

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12 days ago, # |
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try this

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11 days ago, # |
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Try "SetupVPN" chrome extension, its free and it always works for me

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10 days ago, # |
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Since VPNs don't seem to work, have you tried Tor or I2P?

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    10 days ago, # ^ |
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    Tor and I2P's websites are blocked, and I couldn't install its snap(an error occurs).

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      10 days ago, # ^ |
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      After some hard works, I finaly managed to install Tor. It doesn't connect directly but it connects with bridges. :)

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10 days ago, # |
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Hi, Vietnamese have this group. It has several OI-style contests and problem sets that you may find helpful. The statements, however, are most if not all in Vietnamese so you have to use some translator to read them.

This group is kind of an archive of old problems (we now have a new website for them), but they were practiced by generations of Vietnamese students so I believe there's still a lot of value in them. Some of the problems have editorial, you can PM me on Codeforces when you need them. Good luck!

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