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The programming first-round exam of the Indian Computing Olympiad, open to all school students up to Class 12 and one of two ways into INOI and the IOI pathway.
ZCO is a programming test conducted with CodeChef; the languages allowed are C, C++, Java and Python. A student may write ZIO or ZCO or both and qualify for INOI through either. About 30 INOI students attend the IOI Training Camp, which selects the team of four for the International Olympiad in Informatics (IOI-2027, Germany). Syllabus: 'Basic Topics' of the ICO Online Study Material; past papers are in the ICO Archives.