Qualification contest of the Open Olympiad in Informatics 2023–2024 [pdf](inf-open.ru)
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Qualification contest of the Open Olympiad in Informatics 2023–2024 [pdf]
https://inf-open.ru/resource/2023-24/zaoch-2023-en.pdf
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This is the annual coding contest organized in Russia by several universities for the last 18 years. The tasks are targeted at high school students but are traditionally quite hard.