LNOI

LNOI stands for Liaoning Informatics Olympiad, or 辽宁省信息学奥林匹克竞赛 in Chinese. It is a regional informatics competition and online judging platform in Liaoning Province, China, operated as part of the broader National Olympiad in Informatics (NOI) system. The program serves to train, assess, and select young programmers for national competitions and, potentially, for the International Olympiad in Informatics (IOI). The platform combines in-person contests with an online judge that hosts a problem archive, submission judging, and editorial resources. It offers training materials and problems covering NOI topics such as data structures, graph theory, dynamic programming, greedy algorithms, and computational geometry.

Participants are typically high school students in Liaoning and surrounding areas who prepare for NOI and IOI through LNOI resources. The site is used to practice, compete, and learn through explanations and discussions; successful contestants may advance to national teams or receive invitations to training camps. The content is primarily in Chinese, with some problems and discussions referencing English terminology found in the broader NOI ecosystem.

LNOI is one of several provincial NOI initiatives in China that support the national selection process for the IOI. While the NOI governs official national team selection, provincial platforms like LNOI provide localized training, problem sets, and coaching. Access is usually via registration on the LNOI platform, and contributions come from teachers, coaches, and experienced contestants.

See also: NOI, IOI, Luogu, Online judges in China.