20 years of IOI competition tasks

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The competition tasks at the International Olympiad in Informatics have evolved over its 20-year history. We distinguish three periods in this evolution and highlight it from various viewpoints. The 101 competition tasks are presented in a table that summarizes their task type and difficulty level, and that classifies them according to concepts involved in their problem and solution domains.

Original languageEnglish
Pages (from-to)149-166
Number of pages18
JournalOlympiads in Informatics
Publication statusPublished - 1 Jan 2009
EventInternational Conference Joint with the 21st International Olympiad in Informatics, IOI 2009 - Plovdiv, Bulgaria
Duration: 8 Aug 200915 Aug 2009


  • Algorithmics
  • Competition tasks
  • Computer science competition
  • History
  • International olympiad in informatics


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