oj.uz
Practise past olympiad tasks from IOI, APIO, BOI, JOI and more with partial scoring
oj.uz is an online judge that archives tasks from informatics olympiads and grades your submissions with subtask scores, the way the original contests did. You pick a source, such as the IOI, APIO, Baltic, Central European or Japanese olympiads, COCI or the European Girls' Olympiad, and solve its tasks.
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About oj.uz
It is a standard practice ground for students training for olympiads, because it has many contests' full task sets in one place with their original scoring. Every submitted solution is public, so after solving or giving up you can read other people's code.
The interface is available in Korean and English and the site is free. Problems can be browsed without signing in; submitting presumably needs an account. The archive is kept current, with IOI 2026 tasks already added.
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