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Problemsetters' Credits
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ProblemTitleProblemsetterTests-SetterSpecial Thanks
219Department of Redundancy DepartmentRuben Spaans
254Towers of HanoiMiguel Revilla
364Constitutional ComputingBrian Fry
Krzysztof Stencel
Ruben Spaans
479Irrigation Flow RatesJosh Bao
480Tempus FugitBrian Fry
513Window FramesBrian Fry
Krzysztof Stencel
Rujia Liu
522Schedule ProblemJosh Bao
Krzysztof Stencel
528The Problem of Train SetoutJosh Bao
Krzysztof Stencel
541Error CorrectionMiguel Filgueiras
582Randomly Wired Neural NetsJosh Bao
597Last Name First, PleaseJosh Bao
607Scheduling LecturesHoward Cheng
649You Who?Krzysztof Stencel
Josh Bao
701The Archeologists' DilemmaMiguel Revilla
702The Vindictive CoachMiguel Revilla
703Triple Ties: The Organizer's NightmareMiguel Revilla
704Colour HashPablo Puente
717Calculating Expressions on Turing MachineJosh Bao
761Transform those stringsJosh Bao
770PuncherMiguel Filgueiras
772Divide et unitaKrzysztof Stencel
773The JustaPox LanguageJosh Bao
774Driving in City SquaresJosh Bao
775Hamiltonian CycleMahbub Mushed Suman
Miguel Revilla
778Recording a tapeBrian Fry
779Wily Hacker's ProblemJosh Bao
780Sentence GeneratorJosh Bao
781OptimisationJosh Bao
Krzysztof Stencel
788One Day ToursJosh Bao
789IndexingBrian Fry
791Term ReductionsJosh Bao
792Program ModulesBrian Fry
824Coast TrackerAmilcar Cardoso
825Walking on the Safe SideCristina Ribeiro
826Symbolic Numerical SystemDelfim Marado Torres
827Buddy Memory AllocatorFernando Silva
828Deciphering MessagesIsabel Nunes
829Almost Balanced TreesMiguel Filgueiras
830SharkPedro Guerreiro
831Document ValidatorPedro Henriques
832Financial RiskJosé Paulo Leal
833Water FallsA. Augusto Sousa
834Continued FractionsFernando Silva
835Square of PrimesGabriel David
836Largest SubmatrixFernando Silva
837Light and TransparenciesA. Augusto Sousa
838Worm WorldFernando Silva
839Not so MobileJosé Paulo Leal
840Deadlock DetectionFernando Silva
841SnakeFernando Silva
842Crossword PuzzlesGordon V. Cormack
Pedro Vasconcelos
843Crypt KickerGordon V. Cormack
844PousseDavid Mason
Ryerson Polytech
845Gas Station NumbersGordon V. Cormack
846StepsPiotr Rudnicki
848FmtGordon V. Cormack
850Crypt Kicker IIGordon V. Cormack
851MazeGordon V. Cormack
852Deciding victory in GoJoao Neto
853DVD SubtitlesPedro Guerreiro
854Worse CodeJoachim Wulff (Little Joey)
Ruben Spaans
855Lunch in Grid CityFernando Silva
856The Vigenère CipherAntonio Ferreira
857QuantiserAmilcar Cardoso
858Berry PickingCristina Ribeiro
859Chinese CheckersPedro Henriques
860Entropy Text AnalyzerDelfim Marado Torres
861Little BishopsRezaul Alam Chowdhury
867Storing Images in a SequenceJosh Bao
871Counting Cells in a BlobFernando Silva
872OrderingGabriel David
875MonopolyJosh Bao
876Balanced ExpressionsJosh Bao
881Points, Polygons and ContainersA. Augusto Sousa
883Overlapping RectanglesA. Augusto Sousa
889IslandsJoachim Wulff (Little Joey)
Ruben Spaans
890Maze (II)Joachim Wulff (Little Joey)
Ruben Spaans
894Juggling TramsJoachim Wulff (Little Joey)
Ruben Spaans
900Brick Wall PatternsFernando Silva
901From Databases to XMLGabriel David
Josh Bao
902Password SearchRicardo Lopes
903Spiral of NumbersJosé Paulo Leal
904Overlapping Air Traffic Control ZonesFernando Silva
905Tacos PanchitaAmilcar Cardoso
906Rational NeighborDelfim Marado Torres
907Winterim Backpacking TripFernando Silva
908Re-connecting Computer SitesJoao Marques
909The BitPack Data Compression ProblemJose Carlos Ramallo
910TV gameGabriel David
911Multinomial CoefficientsPedro Guerreiro
912Live From MarsSimao Sousa
913Joana and the Odd NumbersFernando Silva
914Jumping ChampionPedro Ribeiro
915Stack of CylindersA. Augusto Sousa
916Dividing LandPedro Ribeiro
917Euro 2004Pedro Ribeiro
918ASCII MandelbrotPedro Ribeiro
919Cutting PolyominoesAna Paula Tomas
920Sunny MountainsSimao Melo de Sousa
921A Word Puzzle in the Sunny MountainsPedro Henriques
922Rectangle by the OceanPedro Guerreiro
923One Against ManyNuno Preguica
924Spreading The NewsMargarida Mamede
925No more prerequisites, please!Isabel Nunes
926Walking Around WiselyFernando Silva
927Integer Sequences from Addition of TermsDelfim Marado Torres
928Eternal TruthsAna Paula Maldonado
930Polynomial RootsJosh Bao
Krzysztof Stencel
932Checking the N-Queens ProblemBrian Fry
933Water FlowAntonio Ferreira
Brian Fry
934Overlapping AreasBrian Fry
935Smart StrategyJosh Bao
Krzysztof Stencel
936Mars for SaleJosh Bao
Krzysztof Stencel
937Kriss Kross PuzzleBrian Fry
938GilixBrian Fry
940Autobiographical NumbersKrzysztof Stencel
942Cyclic NumbersBrian Fry
943Number Format TranslatorBrian Fry
944Happy NumbersRoger Isanta
945Loading a Cargo ShipAntonio Ferreira
963Spelling CorrectorBrian Fry
965Police Road BlocksBrian Fry
966Lost InheritancesBrian Fry
Josh Bao
Krzysztof Stencel
967CircularJane Alam Jan
Joachim Wulff (Little Joey)
968ConstellationsJosh Bao
971TowersBrian Fry
974Kaprekar NumbersJane Alam Jan
Joachim Wulff (Little Joey)
979The Abominable TrianglemanAmilcar Cardoso
Francisco Pereira
980X-ExpressPedro Henriques
981Systematic Cyclic Redundancy Check CodesManuela Pereira
982CubeJose Oliveira
983Localized Summing for BlurringPaul Crocker
984Finding HaplotypesArlindo Oliveira
985Round and Round MazePedro Ribeiro
986How Many?Delfim Marado Torres
987MaternityPedro Guerreiro
994POPJosh Bao
998DendogramBrian Fry
999Book signaturesAntonio Ferreira
Roger Isanta
1139Stormy VersaillesJosh Bao
1140Charles Frédéric GrosJosh Bao
1141Count wireless LinksBrian Fry
1142Fighting the HeatBrian Fry
1143Fighting the Heat IIBrian Fry
1144Find the WallsBrian Fry
1145WarBrian Fry
1176A Benevolent JosephusJosh Bao
1177A General Recurrence RelationJosh Bao
1178The Juice ShopJosh Bao
1179Minimal Cover of Prime ImplicantsJosh Bao
1180Perfect NumbersEmanuel Tesar
1181Rubik's CubeJosh Bao
1182Sequence AlignmentJosh Bao
1183Turn All the Lights OffJosh Bao
1192Searching Sequence Database in Molecular BiologyJosh Bao
1266Magic SquareLeonardo Boshell
1270Paint the MapJosh Bao
1271BangleJosh Bao
1272Circle NetworkBrian Fry
1273WeiqiJosh Bao
1274Color RopesJosh Bao
1275The Revolution of the AntsJosh Bao
1276Game FanJosh Bao
1277How Many Days Are ThereJosh Bao
1278Princess and HeroJosh Bao
1306The K-LeagueRujia Liu
1336Fixing the Great WallRujia Liu
1370RoommateJosh Bao
1371PeriodJosh Bao
1372Log JumpingJosh Bao
1473Dome of CircusJosh Bao
1474Evacuation PlanJosh Bao
1520FlightsJosh Bao
1533Moving PegsJosh Bao
1536CoinsBrian Fry
1561Cycle GameJosh Bao
1618Weak KeyRujia Liu
1643Angle and SquaresRujia Liu
1656Exponential TowersRujia Liu
1663Purifying MachineBrian Fry
1688RoofRujia Liu
1689International EventRujia Liu
10008What's Cryptanalysis?Gordon V. Cormack
10009All Roads Lead Where?Gordon V. Cormack
10010Where's Waldorf?Gordon V. Cormack
10011Where Can You Hide?Gordon V. Cormack
10012How Big Is It?Gordon V. Cormack
10013Super long sumsAlex Gevak
10014Simple calculationsAlex Gevak
10020Minimal coverageAlex Gevak
10021Cube in the labirintAlex Gevak
10022Delta-waveAlex Gevak
10023Square rootAlex Gevak
10024Curling up the cubeAlex Gevak
10025The ? 1 ? 2 ? ... ? n = k problemAlex Gevak
10026Shoemaker's ProblemAlex Gevak
10027Language CardinalityGordon V. Cormack
10028Demerit PointsGordon V. Cormack
10029Edit Step LaddersGordon V. Cormack
10031SaskatchewanGordon V. Cormack
10032Tug of WarGordon V. Cormack
10033InterpreterGordon V. Cormack
10034FrecklesGordon V. Cormack
10035Primary ArithmeticGordon V. Cormack
10037BridgeGordon V. Cormack
10040Ouroboros SnakePablo Puente
10041Vito's FamilyPablo Puente
10047The MonocycleRezaul Alam Chowdhury
10048AudiophobiaRezaul Alam Chowdhury
10049Self-describing SequenceRezaul Alam Chowdhury
10050HartalsRezaul Alam Chowdhury
10051Tower of CubesRezaul Alam Chowdhury
10052Inviting PoliticiansRezaul Alam Chowdhury
10053EnvelopesRezaul Alam Chowdhury
10054The NecklaceRezaul Alam Chowdhury
10055Hashmat the Brave WarriorShahriar Manzoor
10056What is the Probability ?Shahriar Manzoor
10058Jimmi's RiddlesRezaul Alam Chowdhury
Suman Kumar Nath
Tarique Mesbaul Islam
10059The Hazard of CSE Department!Shahriar Manzoor
10060A hole to catch a manRezaul Alam Chowdhury
Suman Kumar Nath
Tarique Mesbaul Islam
10061How many zero's and how many digits ?Shahriar Manzoor
10062Tell me the frequencies!Shahriar Manzoor
10063Knuth's PermutationShahriar Manzoor
10065Useless Tile PackersRezaul Alam Chowdhury
Shahriar Manzoor
10066The Twin TowersRezaul Alam Chowdhury
Shahriar Manzoor
10067Playing with WheelsRezaul Alam Chowdhury
Shahriar Manzoor
10068The Treasure HuntRezaul Alam Chowdhury
Shahriar Manzoor
10069Distinct SubsequencesRezaul Alam Chowdhury
Shahriar Manzoor
10070Leap Year or Not Leap Year and ...Shahriar Manzoor
Rezaul Alam Chowdhury
10071Back to High School PhysicsShahriar Manzoor
Rezaul Alam Chowdhury
10072Bob Laptop Woolmer and Eddie Desktop BarlowRezaul Alam Chowdhury
Shahriar Manzoor
10073Constrained Exchange SortRezaul Alam Chowdhury
Shahriar Manzoor
10074Take the LandRezaul Alam Chowdhury
Shahriar Manzoor
10075AirlinesRezaul Alam Chowdhury
Shahriar Manzoor
10076The Bumpy RobotRezaul Alam Chowdhury
Shahriar Manzoor
10077The Stern-Brocot Number SystemRezaul Alam Chowdhury
Shahriar Manzoor
10078The Art GalleryRezaul Alam Chowdhury
Shahriar Manzoor
10079Pizza CuttingRezaul Alam Chowdhury
Shahriar Manzoor
10080Gopher IIPiotr Rudnicki
10081Tight WordsPiotr Rudnicki
10082WERTYUGordon V. Cormack
10083DivisionPiotr Rudnicki
10084Hotter ColderGordon V. Cormack
10085The most distant stateRezaul Alam Chowdhury
10086Test the RodsRezaul Alam Chowdhury
10087The Tajmahal of ++Y2kShahriar Manzoor
10088Trees on My IslandRezaul Alam Chowdhury
10089RepackagingRezaul Alam Chowdhury
10090MarblesRezaul Alam Chowdhury
10091The Valentine's DayShahriar Manzoor
10092The Problem with the Problem SetterRezaul Alam Chowdhury
10093An Easy Problem!Shahriar Manzoor
10094Place the GuardsShahriar Manzoor
10095Saving the PlanetShahriar Manzoor
10096The Richest Man of the UniverseShahriar Manzoor
10097The Color GameRezaul Alam Chowdhury
10098Generating FastShahriar Manzoor
10099The Tourist GuideRezaul Alam Chowdhury
10100Longest MatchTanbir Ahmed
10101Bangla NumbersTanbir Ahmed
10102The path in the colored fieldOlga Zaverach
10103Karpovich blocksSergey Karpovich
10104Euclid ProblemAlexander Denisjuk
10105Polynomial CoefficientsAlexander Denisjuk
10106ProductEugeny Voronin
10107What is the Median?Sadi Khan
10108The Mosquito Killer MosquitosSuman Mahbub
10109Solving Systems of Linear EquationsSuman Mahbub
10110Light, more lightSadi Khan
Suman Mahbub
10117Nice MilkRujia Liu
10118Free CandiesRujia Liu
10119Farewell, my friendRujia Liu
10120Gift?!Rujia Liu
10121Legendary PokemonRujia Liu
10122Mysterious MountainRujia Liu
10124SubwayGordon V. Cormack
10125SumsetsGordon V. Cormack
10126Zipf's LawGordon V. Cormack
10127OnesPiotr Rudnicki
10128QueueMarcin Wojciechowsky
10129Play on WordsMarcin Wojciechowsky
10130SuperSaleMarcin Wojciechowsky
10131Is Bigger Smarter?Charlie Rackoff
10132File FragmentationCharles L. A. Clarke
10133Audubon's Stormy Arctic TripMichael Van Biesbrouck
10134AutoFishCharles L. A. Clarke
10135Herding FroshGordon V. Cormack
10136Chocolate Chip CookiesGordon V. Cormack
10137The TripGordon V. Cormack
10138CDVIIGordon V. Cormack
10139FactovisorsGordon V. Cormack
10140Prime DistanceDavid Mason
10141Request for ProposalGordon V. Cormack
10142Australian VotingGordon V. Cormack
10149YahtzeeGordon V. Cormack
10150DoubletsGordon V. Cormack
10151SpaghettiGordon V. Cormack
10152ShellSortCharles L. A. Clarke
Gordon V. Cormack
10153New HorizonsCharles L. A. Clarke
Gordon V. Cormack
10154Weights and MeasuresGordon V. Cormack
10155Green Eggs and HamCharles L. A. Clarke
Michael Van Biesbrouck
10156Sala-ma-Sond, A Nice Little PondCharles L. A. Clarke
10157ExpressionsPetko Minkov
10158WarPetko Minkov
10159StarPetko Minkov
10160Servicing StationsPetko Minkov
10168Summation of Four PrimesShahriar Manzoor
10169Urn-ball Probabilities!Shahriar Manzoor
10170The Hotel with Infinite RoomsShahriar Manzoor
10171Meeting Prof. Miguel...Shahriar Manzoor
10172The Lonesome Cargo DistributorRezaul Alam Chowdhury
10173Smallest Bounding RectangleRezaul Alam Chowdhury
10174Couple-Bachelor-Spinster Numbers.Shahriar Manzoor
10175SphereShahriar Manzoor
10176Ocean Deep! - Make it shallow!!Shahriar Manzoor
10177(2/3/4)-D Sqr/Rects/Cubes/Boxes?Shahriar Manzoor
10178Count the Faces.Shahriar Manzoor
10179Irreducable Basic FractionsRezaul Alam Chowdhury
10180Rope Crisis in Ropeland!Rezaul Alam Chowdhury
1018115-Puzzle ProblemRezaul Alam Chowdhury
Shahriar Manzoor
Munirul Abedin
10201Adventures in Moving - Part IVOndřej Lhoták
10202Pairsumonious NumbersGordon V. Cormack
Piotr Rudnicki
10203Snow ClearingGordon V. Cormack
10204Adventures in Moving - Part VGordon V. Cormack
10205Stack 'em UpGordon V. Cormack
10207The Unreal TournamentShahriar Manzoor
10208Liar or Not Liar that is the...Shahriar Manzoor
10209Is This Integration ?Shahriar Manzoor
10210Romeo and Juliet !Shahriar Manzoor
10211Divisibility Testing! Wow!Shahriar Manzoor
10212The Last Non-zero Digit.Shahriar Manzoor
10213How Many Pieces of Land ?Shahriar Manzoor
10215The Largest/Smallest Box ...Shahriar Manzoor
10216The Optimal Coffee Shop!!Shahriar Manzoor
10217A Dinner with Schwarzenegger!!!Shahriar Manzoor
10218Let's Dance !!!Shahriar Manzoor
10219Find the ways !Ahmed Shamsul Arefin
10220I Love Big Numbers !Ahmed Shamsul Arefin
10221SatellitesAhmed Shamsul Arefin
10222Decode the Mad manAhmed Shamsul Arefin
10223How many nodes ?Ahmed Shamsul Arefin
10224Return of the JediGordon V. Cormack
10225Discrete LoggingGordon V. Cormack
10226Hardwood SpeciesGordon V. Cormack
10227ForestsGordon V. Cormack
10228A Star not a Tree?Gordon V. Cormack
10229Modular FibonacciArun Kishore
10230Savage GardenArun Kishore
10231Matrix WorldArun Kishore
10232Bit-wise SequenceArun Kishore
10233Dermuba TriangleArun Kishore
10234Frequent SubstringsArun Kishore
10235Simply EmirpArun Kishore
10236The Fibonacci PrimesShahriar Manzoor
10237BishopsRezaul Alam Chowdhury
10238Throw the DiceShahriar Manzoor
10239The Book-shelver's ProblemRezaul Alam Chowdhury
10240The n-Dimensional CitiesShahriar Manzoor
10241Semi-triangular and also SquareShahriar Manzoor
10243Fire! Fire!! Fire!!!Rezaul Alam Chowdhury
10244First Love !!!Shahriar Manzoor
10245The Closest Pair ProblemShahriar Manzoor
10246Asterix and ObelixRezaul Alam Chowdhury
10247Complete Tree LabelingShahriar Manzoor
10248The Integer All-time ChampMiguel Revilla
10249The Grand DinnerRezaul Alam Chowdhury
10250The Other Two TreesShahriar Manzoor
10251Min-Max CakeShahriar Manzoor
10253Series-Parallel NetworksRezaul Alam Chowdhury
10254The Priest MathematicianMiguel Revilla
10255The knight's TourShahriar Manzoor
10256The Great Divide