ICOIndian Computing Olympiad (ZIO/ZCO → INOI → IOITC)
About ICO
The Indian Computing Olympiad is the official national programme that selects India’s team for the International Olympiad in Informatics. Organised by IARCS, it is unusual among Indian olympiads in offering two doors into Stage 1: the pen-and-paper ZIO, where problems yield to systematic logical work, and the online ZCO, a genuine programming contest — students may attempt either or both.
Qualifiers meet at INOI, a three-hour contest of two hard algorithmic problems solved in C++. Around thirty national toppers then attend the IOI Training Camp, where team-selection tests pick India’s four IOI representatives. Beyond team selection, strong ICO performance has become a respected signal for computer-science admissions and internships.
Accepted by: INOI toppers join the IOI Training Camp (IOITC), from which the four-member team representing India at the International Olympiad in Informatics is selected
Official websiteICO eligibility
School students in India (up to Class 12); no minimum class — younger students regularly participate
ICO exam pattern
Sections
- Stage 1 (choose either): Zonal Informatics Olympiad (ZIO) — a paper-based algorithmic problem test — or Zonal Computing Olympiad (ZCO) — a timed programming contest
- Stage 2: Indian National Olympiad in Informatics (INOI) — two algorithmic problems to be solved in C++ in 3 hours
- Stage 3: International Olympiad in Informatics Training Camp (IOITC) for roughly the top 30
Marking scheme: None
ICO syllabus outline
- Algorithmic thinking: ad-hoc reasoning, dynamic programming, graphs, greedy methods and data structures
- ZIO needs no programming at all — answers are worked out on paper; ZCO and INOI require coding (C++ at INOI)
- Recent zonal and national rounds have been hosted on competitive-programming platforms (CodeChef through 2023, CodeDrills since 2024)
Preparing for ICO?
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