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Croatian Mathematical Olympiad 2011 Problem 1-2Croatian Mathematical Olympiad 2011ColoringCombinatoricsGraphs
Croatian Mathematical Olympiad 2012 Problem 2-2Croatian Mathematical Olympiad 2012CombinatoricsGraphsOptimization
Croatian Mathematical Olympiad 2014 Problem 1-2Croatian Mathematical Olympiad 2014ColoringCombinatoricsGraphsPolygon
Croatian Mathematical Olympiad 2014 Problem M-2Croatian Mathematical Olympiad 2014CombinatoricsCountingGraphs
Croatian Mathematical Olympiad 2015 Problem 1-2Croatian Mathematical Olympiad 2015GeometryGraphsOptimization
Croatian Mathematical Olympiad 2015 Problem I-2Croatian Mathematical Olympiad 2015CombinatoricsGraphs
Croatian Mathematical Olympiad 2016 Problem I-2Croatian Mathematical Olympiad 2016ColoringCombinatoricsGeometryGraphs
Croatian Mathematical Olympiad 2017 Problem I-2Croatian Mathematical Olympiad 2017CombinatoricsCountingGraphs
Croatian Mathematical Olympiad 2018 Problem 2-2Croatian Mathematical Olympiad 2018CombinatoricsGeometryGraphs
Croatian Mathematical Olympiad 2020 Problem I-2Croatian Mathematical Olympiad 2020ColoringCombinatoricsGeometryGraphs
Croatian Mathematical Olympiad 2021 Problem 1-4Croatian Mathematical Olympiad 2021GraphsModNTPrimes
Croatian Mathematical Olympiad 2022 Problem I-2Croatian Mathematical Olympiad 2022CombinatoricsGraphs
Croatian Mathematical Olympiad 2022 Problem M-2Croatian Mathematical Olympiad 2022CombinatoricsGraphsOptimization
International Mathematical Olympiad 1964 Problem 4International Mathematical Olympiad 1964ColoringCombinatoricsGraphs
International Mathematical Olympiad 1991 Problem 4International Mathematical Olympiad 1991CombinatoricsConstructionGCDGraphs
International Mathematical Olympiad 2007 Problem 3International Mathematical Olympiad 2007CombinatoricsConstructionGraphs
International Mathematical Olympiad 2019 Problem 3International Mathematical Olympiad 2019CombinatoricsGraphs
International Mathematical Olympiad 2020 Problem 4International Mathematical Olympiad 2020CombinatoricsGraphsOptimization
Middle European Mathematical Olympiad 2011 Problem T-4Middle European Mathematical Olympiad 2011CombinatoricsGraphs
Middle European Mathematical Olympiad 2025 Problem T-4Middle European Mathematical Olympiad 2025CombinatoricsGraphsOptimization
Grade 9 2011 Problem 5Grade 9 2011CombinatoricsCountingGraphs
Grade 9 2022 Problem 5Grade 9 2022CombinatoricsGraphsOptimizationPolygon
Grade 10 2017 Problem 5Grade 10 2017ColoringCombinatoricsGraphs
Grade 10 2024 Problem 7Grade 10 2024CombinatoricsCountingGraphsOptimization
Grade 10 2016 Problem 5Grade 10 2016BoardColoringCombinatoricsGraphs
Grade 11 1995 Problem 3Grade 11 1995ColoringCombinatoricsGraphs
Grade 11 2002 Problem 4Grade 11 2002ColoringCombinatoricsGraphs
Grade 11 2006 Problem 4Grade 11 2006CombinatoricsGraphs
Grade 11 2015 Problem 3Grade 11 2015CombinatoricsGraphs
Grade 11 2021 Problem 5Grade 11 2021CombinatoricsGraphsParity
Grade 11 2025 Problem 5Grade 11 2025CombinatoricsGraphsOptimizationPolygon
Grade 12 2006 Problem 4Grade 12 2006CombinatoricsGraphs
Grade 12 2018 Problem 5Grade 12 2018CombinatoricsGraphsOptimization
Grade 12 2026 Problem 5Grade 12 2026CombinatoricsGraphsOptimization
Grade 12 2017 Problem 1Grade 12 2017CombinatoricsGraphsProbability
Grade 12 2020 Problem 3Grade 12 2020CubeGraphsOptimization3D
Grade 12 2026 Problem 3Grade 12 2026CombinatoricsGraphsOptimization