Call for Tasks
International Olympiad in Informatics 2026 — Scientific Committee
The IOI 2026 Scientific Committee invites the IOI community to help design the competition tasks. We welcome both easy and difficult problems that are creative, clear, and enjoyable.
Competition Tasks
IOI tasks focus on efficient, correct algorithms with simple input and output. IOI needs both simple and difficult tasks that are creative. We actively encourage easy problems that still require insight and allow multiple approaches.
New task types are welcome, including reactive and output-only tasks, and tasks assessed beyond CPU time. See the IOI Syllabus as a guideline.
Previous IOI Competition Tasks
Recent task collections:
See the broader archive here.
The nature of past tasks should not restrict the design of new tasks. Submissions of innovative task types not previously seen at IOIs are encouraged.
We are particularly interested in tasks with accessible basic rules and tasks that illustrate algorithms arising from real-world scenarios.
Eligibility & Integrity
Conditions
Submissions must satisfy the following:
- Not seen by potential IOI 2026 contestants
- Not used in any recent similar competition
- Solvable during an IOI round
- Unambiguous, easy-to-understand statements
- Original and/or innovative
Confidentiality
Submissions remain confidential until IOI 2026 concludes. If considered for IOI 2027, confidentiality extends accordingly.
Task Criteria
Include the following
Statement in English
PDF preferred, with diagrams if needed
Full-score solution
Description of the desired full-score algorithm
Author contact and background
Name, email, affiliation, country, and roles in IOI or national olympiad (IOI 2024–2026)
PGP key ID (optional)
If you want ISC feedback
Strongly recommended
Submission Process
Submission Method
Bundle all materials into a single file (.zip or .tgz for multiple files) and submit online.
Authorization Code
samarkand
Encryption: do not encrypt manually; the upload page handles it.
Confidentiality
All submissions must remain confidential until IOI 2026 concludes. If considered for IOI 2027, confidentiality extends accordingly.
What Happens Next
The Scientific Committee will review all submissions and select a shortlist of around 10 tasks, six of which are expected to be used at IOI 2026 in Uzbekistan.
Authors of shortlisted tasks may be invited to attend IOI 2026 as guests (travel typically at the author’s expense; stay covered by the host).
All authors will receive feedback from the ISC. Authors of tasks included in the official competition will be credited on the IOI website (unless they decline). Problems will be available under the CC-BY license.
Summary
| Submission deadline | TBA |
| Language | English |
| Format | PDF preferred |
| Multiple files | zip/tar into a single archive |
| Multiple Tasks | Submit separately |
| Submission Portal | isc.ioinformatics.org/taskbox/ |
| Authorization | samarkand |
Contact Information
Direct inquiries regarding task submissions to the Scientific Committee