High school olympiads

IOI and other international high school olympiads

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International Olympiad in Informatics

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2025Day 1SouvenirsTriple PeaksWorld Map
Day 2FestivalMigrationsObstacles for a Llama
2024Day 1NileMessageTree
Day 2HieroglyphsMosaicSphinx's Riddle
2023Day 1Closing TimeLongest TripSoccer Stadium
Day 2Beech TreeOvertakingRobot Contest
2022Day 1Catfish FarmPrisoner ChallengeRadio Towers
Day 2Digital CircuitRarest InsectsThousands Islands
2021Day 1Distributing CandiesKeysFountain Parks
Day 2Mutating DNADungeons GameBit Shift Registers
2020Day 1Comparing PlantsConnecting SupertreesCarnival Tickets
Day 2Packing BiscuitsCounting MushroomsStations
2019Day 1Arranging ShoesSplit the AttractionsRectangles
Day 2Broken LineVision ProgramSky Walking
2018Day 1ComboSeatsWerewolf
Day 2Mechanical DollHighway TollsMeetings
2017Day 1NowruzWiringToy Train
Day 2The Big PrizeSimurghAncient Books
2016Day 1Detecting MoleculesRoller Coaster RailroadShortcut
Day 2Paint By NumbersUnscrambling a Messy BugAliens
2015Day 1Boxes with souvenirsScalesTeams
Day 2HorsesSortingTowns
2014Day 1RailWallGame
Day 2GondolaFriendHoliday
2013Day 1DreamingArt ClassWombats
Day 2CaveRobotsGame
2012Day 1Parachute ringsCrayfish scrivener
Day 2Ideal cityLast supperJousting tournament

Baltic Olympiad in Informatics

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2025Day 1BOI AcronymTourTower
Day 2DeveloperExponentsGingerbread
2024Day 1JobsPortalTrains
Day 2FireTilesFlooding Wall
2023Day 1AstronomerStaring ContestTycho
Day 2MinequakeMineral depositsSequence
2022Day 1Art CollectionsEvent HoppingUplifting Excursion
Day 2Flight to the FordStranded Far From HomeBoarding Passes
2021Day 1A Difficult(y) ChoiceInside informationFrom Hacks to Snitches
Day 2The short shank; RedemptionThe Collection GameThe Xana coup
2020Day 1ColorsMixtureJoker
Day 2GraphVillageViruses
2019Day 1NautilusValley
Day 2KitchenNecklaceOlympiads
2018Day 1Love PolygonMartian DNAWorm Worries
Day 2Alternating CurrentGeneticsPaths
2017Day 1Political DevelopmentRailwayToll
Day 2Cat in a treeFriendsPlus Minus
2016Day 1BossesParkSpiral
Day 2CitiesSwap
2015Day 1BowlingEditorNetwork
Day 2File PathsHackerTug of War

Central European Olympiad in Informatics

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2025Day 1BoardgamesEqualmexHighest
Day 2Lawn MowerSplitsTheseus
2024Day 1Naval battleCOVID testsText editor
Day 2ToyPetrol stationsSprinklers
2023Day 1A Light InconvenienceBring Down the Grading ServerBrought Down the Grading Server?
Day 2Tricks of the TradeThe Ties That Guide UsHow to Avoid Disqualification in 75 Easy Steps
2022Day 1AbracadabraHomeworkPrize
Day 2DrawingMeasuresParking
2021Day 1DiversityL-triominoesNewspapers
Day 2TortoiseWells
2020Day 1Fancy FenceRoadsStar Trek
Day 2The Potion of Great PowerSpring cleaningChess Rush
2019Day 1Building SkyscrapersCubewordDynamic Diameter
Day 2Amusement ParkMagic TreeScissors and Tape
2018Day 1Cloud ComputingGlobal WarmingLottery
Day 2Fibonacci representationsToysTriangles
2017Day 1One-Way StreetsSure BetMousetrap
Day 2Building BridgesPalindromic PartitionsChase
2016Day 1ICCKangaroo
Day 2MatchPopealaRouter
2015Day 1Potemkin cycleCalvinball championshipPipes
Day 2Ice Hockey World ChampionshipNuclearia

Japanese Olympiad in Informatics — Spring Camp

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2026Day 1Legendary Dango EaterGarden 3Multi Communication 2
Day 2CasinoJOI Tour 2Teleporter 2
Day 3Triangular RainfallScarecrows 2Collecting Stamps 5
Day 4BakerFestivals in JOI Kingdom 3Voltage 2
2025Day 1Exhibition 3Fortune Telling 3Bitaro's Travel 2
Day 2AmbulanceCollecting Stamps 4Space Thief
Day 3Bitaro the Brave 3ConferenceMulti Communication
Day 4Circuit 2Migration PlanUiro
2024Day 1Fish 3Ski 2Spy 3
Day 2Board GameTricolor LightsGrowing Vegetables is Fun 5
Day 3Card CollectionJOI tourTower
Day 4Escape Route 2Island HoppingTable Tennis
2023Day 1Two CurrenciesFestivals in JOI Kingdom 2Passport
Day 2CouncilMizuyokan 2
Day 3ChorusCookiesTourism
Day 4Security GuardBitaro's travel
2022Day 1JailSightseeing in KyotoMisspelling
Day 2Copy and Paste 3FlightsTeam Contest
Day 3Broken Device 2SprinklerAnts and Sugar
Day 4Super Dango MakerFish 2Reconstruction Project
2021Day 1AerobaticsIOI FeverFood Court
Day 2Escape RouteRoad ConstructionShopping
Day 3Ancient MachineBodyguardMeetings 2
Day 4Event Hopping 2Navigation 2Worst Reporter 4
2020Day 1Building 4Hamburg SteakSweeping
Day 2Chameleon's LoveMaking Friends on Joitter is FunRuins 3
Day 3Constellation 3HarvestStray Cat
Day 4Capital CityLegendary Dango MakerTreatment Project
2019Day 1ExaminationMeetingsNaan
Day 2Two AntennasTwo DishesTwo Transportations
Day 3Designated CitiesLampsBitaro, who Leaps through Time
Day 4Cake 3MergersMinerals
2018Day 1Construction of HighwayFencesTents
Day 2AsceticismWorst Reporter 3
Day 3Airline Route MapBitaro’s PartySecurity Gate
Day 4CandiesLibraryWild Boar
2017Day 1CultivationPort FacilitySparklers
Day 2Arranging TicketsBroken DeviceRailway Trip
Day 3Long Distance CoachLong MansionPark
Day 4Abduction 2CityDragon 2
2016Day 1MatryoshkaMemory 2Solitaire
Day 2EmploymentSandwichToilets
Day 3Dungeon 2SushiTelegraph
Day 4Dangerous SkatingSnowy RoadsWorst Reporter 2
2015Day 1Copy and Paste 2
Day 2Building Decoration 3Spare KeysRoad Development
Day 3AAQQZVery Fun Card Game
Day 4Memory CompressionBarrier
2014Day 1BusFun Vegetable GrowingHistorical ResearchRamen
Day 2Water BottleFriendship TreatyCollecting Stamps
Day 3JOIOJIScarecrowsVoltage
Day 4Constellation 2Kanji ShiritoriStraps
2013Day 1Fun Photo Collection
Day 2Road Construction ProjectMascotsSpy
Day 3CakeKoalaMountain Rescue Team

Japanese Olympiad in Informatics — Open Contest

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2025Bubble Sort MachineLotteryTelepathy
2024Examination 2Heat StrokeLibrary 3
2023Ancient Machine 2Cell AutomatonGarden
2022SeesawGiraffes
2021CrossingFinancial ReportMonster Game
2020FurnitureMonochrome PointsPower Plant
2019Triple JumpRemittanceVirus Experiment
2018Bubble Sort 2Cats or DogsCollapseXylophone
2017Amusement ParkBulldozerGolf
2016JOIRISSelling RNA StrandsSkyscraper
2015Election CampaignSterilizing Spray
2014Day 1FactoriesFortune Telling 2Space Pirate
Day 2Project of MigrationPinballSecret
2013SynchronizationWatching

Nordic Olympiad in Informatics

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2026AlarmsBackroomsCatching ApplesName Change
2025Dodgeball DiplomacyGarbage CollectionXoracle
2024Anime ShopsChair GameThin Ice
2023ChatNOIIce Cream MachinesIsland Alliances
2022Hipster JazzPower GridQuark Microscopy
2021Amazing WhispersPearlsThe Elk
2020Apple DeliveryBricksChristmas Gifts
2019Distance CodeThieves and PrisonsGraph Ordering
2018French FriesMysterious ArrayNordic Camping
2017IP over Avian CarriersSubwayYule Lads