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IOI · International Olympiad in Informatics

Informatics olympiad practice.

Algorithmic tasks with staged ideas, Python solutions and complexity.

Tier
Topic

Feeder round

The corridor of lampsFeeder roundAd hoc & simulation
Booking the school hallFeeder roundGreedy & sorting
Counting fizzy numbersFeeder roundMaths for programmers
The bracket checkerFeeder roundData structures

National final

The rising towerNational finalDynamic programming
Escape with one hammerNational finalGraphs
Fair shares of the takingsNational finalData structures
Weather stations on the ridgeNational finalGreedy & sorting

International

The committee and the guardsInternationalDynamic programming
Toll-free vouchersInternationalGraphs
Islands at high tideInternationalData structures
Paths through the orchardInternationalMaths for programmers