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OI (Olympiad in Informatics) originated in China in 1984 and is one of the five major high school subject competitions.

ICPC (International Collegiate Programming Contest), organized by the ICPC Foundation, is the most influential university-level computer programming competition. Since it was previously sponsored by ACM, many people also commonly refer to it as the ACM competition.

OI Wiki aims to be a free, open, and continuously updated knowledge integration site for competitive programming. Here, you can access interesting and practical knowledge related to competitions. We provide foundational knowledge, common problem types, problem-solving approaches, and commonly used tools in competitions to help you learn the knowledge involved in competitive programming more quickly and deeply.

This project is inspired by CTF Wiki and references numerous materials during its compilation. We extend our gratitude to all of them.

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