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ProblemSourceTags
International Mathematical Olympiad 1984 Problem 3International Mathematical Olympiad 1984CircleColoringGeometry
International Mathematical Olympiad 1984 Problem 4International Mathematical Olympiad 1984CircleGeometryQuadTangent
International Mathematical Olympiad 1984 Problem 5International Mathematical Olympiad 1984GeometryInequalitiesLengthsPolygon
International Mathematical Olympiad 1984 Problem 6International Mathematical Olympiad 1984EqNTParity
International Mathematical Olympiad 1985 Problem 1International Mathematical Olympiad 1985CircleCyclic quadGeometryTangent
International Mathematical Olympiad 1985 Problem 2International Mathematical Olympiad 1985ColoringCombinatoricsNTCoprime
International Mathematical Olympiad 1985 Problem 3International Mathematical Olympiad 1985AlgebraParityPolynomials
International Mathematical Olympiad 1985 Problem 4International Mathematical Olympiad 1985CombinatoricsNTPowersPrimes
International Mathematical Olympiad 1985 Problem 5International Mathematical Olympiad 1985AnglesCircleCircumcircleGeometryTriangle
International Mathematical Olympiad 1985 Problem 6International Mathematical Olympiad 1985AlgebraInequalitiesRecurrencesSeq
International Mathematical Olympiad 1986 Problem 1International Mathematical Olympiad 1986NT
International Mathematical Olympiad 1986 Problem 2International Mathematical Olympiad 1986AnglesEquilateralGeometryTriangle
International Mathematical Olympiad 1986 Problem 3International Mathematical Olympiad 1986CombinatoricsOptimizationPolygon
International Mathematical Olympiad 1986 Problem 4International Mathematical Olympiad 1986CoordGeometryPolygon
International Mathematical Olympiad 1986 Problem 5International Mathematical Olympiad 1986AlgebraFunctional
International Mathematical Olympiad 1986 Problem 6International Mathematical Olympiad 1986ColoringCombinatoricsCoord
International Mathematical Olympiad 1987 Problem 1International Mathematical Olympiad 1987CombinatoricsCountingPermutations
International Mathematical Olympiad 1987 Problem 2International Mathematical Olympiad 1987AreaCircumcircleGeometryPerpendicularityTriangle
International Mathematical Olympiad 1987 Problem 3International Mathematical Olympiad 1987InequalitiesOptimization
International Mathematical Olympiad 1987 Problem 4International Mathematical Olympiad 1987AlgebraFunctional
International Mathematical Olympiad 1987 Problem 5International Mathematical Olympiad 1987AreaConstructionCoordGeometryRational
International Mathematical Olympiad 1987 Problem 6International Mathematical Olympiad 1987NTPolynomialsPrimes
International Mathematical Olympiad 1988 Problem 1International Mathematical Olympiad 1988CircleCoordGeometryOptimization
International Mathematical Olympiad 1988 Problem 2International Mathematical Olympiad 1988ColoringCombinatoricsConstruction
International Mathematical Olympiad 1988 Problem 3International Mathematical Olympiad 1988CountingFunctionsNTRecurrences
International Mathematical Olympiad 1988 Problem 4International Mathematical Olympiad 1988AlgebraInequalitiesSums
International Mathematical Olympiad 1988 Problem 5International Mathematical Olympiad 1988AreaGeometryInequalitiesRight triangleTriangle
International Mathematical Olympiad 1988 Problem 6International Mathematical Olympiad 1988DiophantineDivisibilityNT
International Mathematical Olympiad 1989 Problem 1International Mathematical Olympiad 1989CombinatoricsConstructionSums
International Mathematical Olympiad 1989 Problem 2International Mathematical Olympiad 1989AnglesAreaCircumcircleGeometryTriangle
International Mathematical Olympiad 1989 Problem 3International Mathematical Olympiad 1989CollinearGeometryInequalitiesOptimization
International Mathematical Olympiad 1989 Problem 4International Mathematical Olympiad 1989GeometryInequalitiesOptimizationQuad
International Mathematical Olympiad 1989 Problem 5International Mathematical Olympiad 1989ConstructionNTPowersPrimes
International Mathematical Olympiad 1989 Problem 6International Mathematical Olympiad 1989CombinatoricsCountingPermutations
International Mathematical Olympiad 1990 Problem 1International Mathematical Olympiad 1990CircleGeometryTangent
International Mathematical Olympiad 1990 Problem 2International Mathematical Olympiad 1990CircleColoringCombinatoricsOptimization
International Mathematical Olympiad 1990 Problem 3International Mathematical Olympiad 1990DivisibilityNTPowers
International Mathematical Olympiad 1990 Problem 4International Mathematical Olympiad 1990AlgebraFunctionalRational
International Mathematical Olympiad 1990 Problem 5International Mathematical Olympiad 1990GamesNTPrimes
International Mathematical Olympiad 1990 Problem 6International Mathematical Olympiad 1990ConstructionGeometryPolygon
International Mathematical Olympiad 1991 Problem 1International Mathematical Olympiad 1991GeometryIncircleInequalitiesOptimizationTriangle
International Mathematical Olympiad 1991 Problem 2International Mathematical Olympiad 1991NTPowersPrimesCoprime
International Mathematical Olympiad 1991 Problem 3International Mathematical Olympiad 1991CombinatoricsCountingCoprime
International Mathematical Olympiad 1991 Problem 4International Mathematical Olympiad 1991CombinatoricsConstructionGCDGraphs
International Mathematical Olympiad 1991 Problem 5International Mathematical Olympiad 1991AnglesGeometryInequalitiesTriangle
International Mathematical Olympiad 1991 Problem 6International Mathematical Olympiad 1991AlgebraConstructionInequalitiesSeq
International Mathematical Olympiad 1992 Problem 1International Mathematical Olympiad 1992DiophantineDivisibilityNT
International Mathematical Olympiad 1992 Problem 2International Mathematical Olympiad 1992AlgebraFunctionalFunctions
International Mathematical Olympiad 1992 Problem 3International Mathematical Olympiad 1992ColoringCombinatoricsCountingOptimization
International Mathematical Olympiad 1992 Problem 4International Mathematical Olympiad 1992CircleGeometryIncircleTangentTriangle