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Combinatorics

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Croatian Mathematical Olympiad 2023 Problem 2-2Croatian Mathematical Olympiad 2023CombinatoricsConstructionOptimization
Croatian Mathematical Olympiad 2023 Problem I-2Croatian Mathematical Olympiad 2023CombinatoricsGamesOptimization
Croatian Mathematical Olympiad 2023 Problem M-2Croatian Mathematical Olympiad 2023CombinatoricsConstructionOptimizationSquare
Croatian Mathematical Olympiad 2024 Problem 1-2Croatian Mathematical Olympiad 2024CombinatoricsGames
Croatian Mathematical Olympiad 2024 Problem I-2Croatian Mathematical Olympiad 2024CombinatoricsDivisibilityNTCoprime
Croatian Mathematical Olympiad 2024 Problem M-2Croatian Mathematical Olympiad 2024BoardCombinatoricsParity
Croatian Mathematical Olympiad 2025 Problem 1-2Croatian Mathematical Olympiad 2025CombinatoricsOptimizationPowers
Croatian Mathematical Olympiad 2025 Problem 3-3Croatian Mathematical Olympiad 2025CombinatoricsCountingOptimization
Croatian Mathematical Olympiad 2025 Problem 4-1Croatian Mathematical Olympiad 2025BoardCombinatoricsOptimization
International Mathematical Olympiad 1963 Problem 6International Mathematical Olympiad 1963CombinatoricsPermutations
International Mathematical Olympiad 1964 Problem 4International Mathematical Olympiad 1964ColoringCombinatoricsGraphs
International Mathematical Olympiad 1966 Problem 1International Mathematical Olympiad 1966CombinatoricsCounting
International Mathematical Olympiad 1969 Problem 5International Mathematical Olympiad 1969CombinatoricsCountingGeometryQuad
International Mathematical Olympiad 1970 Problem 4International Mathematical Olympiad 1970CombinatoricsCountingNT
International Mathematical Olympiad 1970 Problem 6International Mathematical Olympiad 1970CombinatoricsGeometryOptimizationTriangle
International Mathematical Olympiad 1972 Problem 1International Mathematical Olympiad 1972CombinatoricsCountingNT
International Mathematical Olympiad 1972 Problem 3International Mathematical Olympiad 1972CombinatoricsFactorialNT
International Mathematical Olympiad 1974 Problem 4International Mathematical Olympiad 1974BoardCombinatoricsOptimizationTiling
International Mathematical Olympiad 1978 Problem 3International Mathematical Olympiad 1978CombinatoricsFunctionsSeq
International Mathematical Olympiad 1978 Problem 6International Mathematical Olympiad 1978CombinatoricsCounting
International Mathematical Olympiad 1979 Problem 2International Mathematical Olympiad 1979ColoringCombinatorics3D
International Mathematical Olympiad 1979 Problem 6International Mathematical Olympiad 1979CombinatoricsCountingPolygonRecurrences
International Mathematical Olympiad 1981 Problem 2International Mathematical Olympiad 1981CombinationsCombinatoricsCounting
International Mathematical Olympiad 1983 Problem 5International Mathematical Olympiad 1983CombinatoricsConstructionCounting
International Mathematical Olympiad 1985 Problem 2International Mathematical Olympiad 1985ColoringCombinatoricsNTCoprime
International Mathematical Olympiad 1985 Problem 4International Mathematical Olympiad 1985CombinatoricsNTPowersPrimes
International Mathematical Olympiad 1986 Problem 3International Mathematical Olympiad 1986CombinatoricsOptimizationPolygon
International Mathematical Olympiad 1986 Problem 6International Mathematical Olympiad 1986ColoringCombinatoricsCoord
International Mathematical Olympiad 1987 Problem 1International Mathematical Olympiad 1987CombinatoricsCountingPermutations
International Mathematical Olympiad 1988 Problem 2International Mathematical Olympiad 1988ColoringCombinatoricsConstruction
International Mathematical Olympiad 1989 Problem 1International Mathematical Olympiad 1989CombinatoricsConstructionSums
International Mathematical Olympiad 1989 Problem 6International Mathematical Olympiad 1989CombinatoricsCountingPermutations
International Mathematical Olympiad 1990 Problem 2International Mathematical Olympiad 1990CircleColoringCombinatoricsOptimization
International Mathematical Olympiad 1991 Problem 3International Mathematical Olympiad 1991CombinatoricsCountingCoprime
International Mathematical Olympiad 1991 Problem 4International Mathematical Olympiad 1991CombinatoricsConstructionGCDGraphs
International Mathematical Olympiad 1992 Problem 3International Mathematical Olympiad 1992ColoringCombinatoricsCountingOptimization
International Mathematical Olympiad 1993 Problem 3International Mathematical Olympiad 1993BoardCombinatoricsGamesParity
International Mathematical Olympiad 1993 Problem 6International Mathematical Olympiad 1993CombinatoricsPowersRecurrencesSeq
International Mathematical Olympiad 1994 Problem 1International Mathematical Olympiad 1994CombinatoricsInequalitiesOptimization
International Mathematical Olympiad 1995 Problem 6International Mathematical Olympiad 1995CombinatoricsCountingModPrimes
International Mathematical Olympiad 1996 Problem 1International Mathematical Olympiad 1996BoardCombinatoricsCoordMod
International Mathematical Olympiad 1996 Problem 6International Mathematical Olympiad 1996CombinatoricsSeq
International Mathematical Olympiad 1997 Problem 4International Mathematical Olympiad 1997CombinatoricsConstructionTables
International Mathematical Olympiad 1997 Problem 6International Mathematical Olympiad 1997CombinatoricsCountingInequalitiesPowers
International Mathematical Olympiad 1998 Problem 2International Mathematical Olympiad 1998CombinatoricsInequalitiesOptimization
International Mathematical Olympiad 1999 Problem 3International Mathematical Olympiad 1999BoardCombinatoricsOptimization
International Mathematical Olympiad 2000 Problem 4International Mathematical Olympiad 2000CombinatoricsConstructionCounting
International Mathematical Olympiad 2001 Problem 3International Mathematical Olympiad 2001CombinatoricsCounting
International Mathematical Olympiad 2002 Problem 1International Mathematical Olympiad 2002ColoringCombinatoricsCounting
International Mathematical Olympiad 2003 Problem 1International Mathematical Olympiad 2003CombinatoricsConstruction