Luogu
Solve algorithm problems in rated rounds on China's big online judge
Luogu is a large Chinese online judge with a busy contest calendar. Official rated rounds run in four divisions, from beginner rounds to monthly Div.1 contests, and teams host open rounds most weekends. Replays of past ICPC regional contests let you practise under contest conditions.
Free · Login needed · Browser
About Luogu
It trains algorithms and data structures for olympiad and ICPC-style contests. Beginners can start in the Div.4 rounds and the problem set, and strong players have hard monthly rounds to aim for.
It runs in the browser and is free. You need an account to enter contests and submit. The interface is mainly in Chinese, so a translation tool helps if you don't read it.
On Breakpoint since 25 Oct 2026.
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