---
id: oly
title: "Olympiads"
author: Benjamin Qi
description: Once you've reached Platinum, it may be helpful to practice with problems from other (inter)national olympiads.
---

> Hello, Which online judge should I practice more to do well in **IOI** ?

> the closest OJ for IOI style?

## [USACO](http://www.usaco.org/)

  * Older Problems
    * [TJ website](http://tjsct.wikidot.com/usaco/)
    * [Korean website to submit ...](https://www.acmicpc.net/category/106)
  * [USACO Training](http://train.usaco.org/usacogate)
    * not particularly beginner-friendly but still helpful
    * somewhat outdated in the sense that it lacks topics which are now quite common (ex. segment tree)
    * if you're unsure about whether it will be useful, you might as well try it and see where you get stuck :P
    * personally, I did the first five chapters in one summer (though I had to look up some hints ...)
  * [article :o](https://www.usenix.org/legacy/bodinfo/bod/bodmarch10/future.pdf)

## [oj.uz](https://oj.uz/)

The [OI Checklist](https://oichecklist.pythonanywhere.com/) is a great way to track your progress. :)

<resources>
  <resource source="IZhO" title="International Zhautykov Olympiad (Kazakhstan)" url="https://izho.kz/"></resource>
  <resource source="APIO" title="Asia-Pacific Informatics Olympiad" url="http://apio-olympiad.org/"></resource>
  <resource source="COCI" title="Croatian Open Contests in Informatics" url="http://hsin.hr/coci/">not full feedback ...</resource>
  <resource source="JOI" title="Japanese Olympiad in Informatics" url="https://www.ioi-jp.org/"></resource>
  <resource source="LMIO" title="Lithuanian Olympiad in Informatics" url="http://online.lmio.lt/"></resource>
  <resource source="InfO(1) Cup" title="InfO(1) Cup" url="http://info1cup.com/"></resource>
</resources>

## [IOI](https://ioinformatics.org/)

Can submit on more recent problems on oj.uz. Also see the following:

  - [Yandex](https://contest.yandex.com/ioi/)
  - [WCIPEG](https://wcipeg.com/problems/cat%3Dioi%2Cshow%3D50)
  - [DMOJ](https://dmoj.ca/problems/?category=5)

Misc:

  - [IOI Syllabus](https://people.ksp.sk/~misof/ioi-syllabus/)
  - [kostka - List of 2019 IOI Participants](http://weaselcrow.com/pro/cf/ioi/19/)

## [CSES](https://cses.fi/)

<resources>
  <resource source="BOI" title="Baltic Olympiad in Informatics" url="http://www.boi2017.org/">2017 website</resource>
  <resource source="CEOI" title="Central European Olympiad in Informatics" url="http://ceoi.inf.elte.hu/"> </resource>
</resources>

## Other

See the [IOI members page](https://ioinformatics.org/page/members/7) for additional links. 

  * [Poland](https://szkopul.edu.pl/portal/)
    * [Solutions (in Polish)](https://www.oi.edu.pl/l/40/)
  * [Canada](https://cemc.math.uwaterloo.ca/contests/computing.html)
    * [WCIPEG](https://wcipeg.com/problems/cat%3Dccc%2Cshow%3D50)
    * [DMOJ](https://dmoj.ca/problems/?category=24)
  * [Philippines](https://noi.ph/past-problems/)
  * [Indonesia](https://competition.ia-toki.org/contests)
  * [Australia](https://orac.amt.edu.au/)
  * [Italy](https://training.olinfo.it/#/overview)
  * [International Informatics Olympiad in Teams](http://ioit.altervista.org/2018-teams-and-contests-.html) (IOIT)
  * [Balkan Olympiad in Informatics](https://boi2019.epy.gr/) (2019 website)