| #1901 | Third Group ExamVKOSHP 2021 | |
| #1902 | Computational ethnographyVKOSHP 2021 | |
| #1903 | Work or Sleep!VKOSHP 2021 | |
| #1904 | Permutation TransformationVKOSHP 2021 | |
| #1907 | 博弈QLR #2 | |
| #1909 | Greedy Pie EatersUSACO 2019 December Platinum | |
| #1910 | Bessie's Snow CowUSACO 2019 December Platinum | |
| #1911 | Tree DepthUSACO 2019 December Platinum | |
| #1912 | Cave PaintingsUSACO 2020 January Platinum | |
| #1913 | Non-Decreasing SubsequencesUSACO 2020 January Platinum | |
| #1914 | Falling PortalsUSACO 2020 January Platinum | |
| #1924 | Joining Powers | |
| #1932 | Sum of Consecutive Prime NumbersTokyo Regional 2005 | |
| #1933 | Book ReplacementTokyo Regional 2005 | |
| #1934 | Colored CubesTokyo Regional 2005 | |
| #1935 | Organize Your TrainTokyo Regional 2005 | |
| #1936 | Mobile ComputingTokyo Regional 2005 | |
| #1937 | Atomic Car RaceTokyo Regional 2005 | |
| #1938 | Network MessTokyo Regional 2005 | |
| #1939 | BingoTokyo Regional 2005 | |
| #1940 | Shy PolygonsTokyo Regional 2005 | |
| #1941 | Alien MicrowaveNADC 2021 | |
| #1942 | Another Substring Query ProblemNADC 2021 | |
| #1943 | BordersNADC 2021 | |
| #1944 | Circle of FriendsNADC 2021 | |
| #1945 | Finding PollyNADC 2021 | |
| #1946 | Investigating ImpostersNADC 2021 | |
| #1947 | Laptop StickerNADC 2021 | |
| #1948 | Longest Common SubstringNADC 2021 | |
| #1949 | Simple Cron SpecNADC 2021 | |
| #1950 | SurveillanceNADC 2021 | |
| #1951 | Train LineNADC 2021 | |
| #1952 | Window ShoppingNADC 2021 | |
| #1953 | You Be the Judge!NADC 2021 | |
| #1954 | Ant ColoniesSeoul Regional 2021Moscow International Workshops 2021 Day 4 | |
| #1955 | Double RainbowSeoul Regional 2021Moscow International Workshops 2021 Day 4 | |
| #1956 | Find The HouseSeoul Regional 2021Moscow International Workshops 2021 Day 4 | |
| #1957 | Friendship GraphsSeoul Regional 2021Moscow International Workshops 2021 Day 4 | |
| #1958 | Grid TriangleSeoul Regional 2021Moscow International Workshops 2021 Day 4 | |
| #1959 | John's GiftSeoul Regional 2021Moscow International Workshops 2021 Day 4 | |
| #1960 | Logical Warehouse 2Seoul Regional 2021Moscow International Workshops 2021 Day 4 | |
| #1961 | PostmanSeoul Regional 2021Moscow International Workshops 2021 Day 4 | |
| #1962 | Security SystemSeoul Regional 2021Moscow International Workshops 2021 Day 4 | |
| #1963 | Squid GameSeoul Regional 2021Moscow International Workshops 2021 Day 4 | |
| #1964 | Stock Price PredictionSeoul Regional 2021Moscow International Workshops 2021 Day 4 | |
| #1965 | TrioSeoul Regional 2021Moscow International Workshops 2021 Day 4 | |
| #1966 | Covid-19Tehran Regional 2021 | |
| #1967 | StatisticsTehran Regional 2021 | |
| #1968 | Science FictionTehran Regional 2021 | |
| #1969 | Necklace ConstructionTehran Regional 2021 | |
| #1970 | Social DistancingTehran Regional 2021 | |
| #1971 | HezardastanTehran Regional 2021 | |
| #1972 | JJ RallyTehran Regional 2021 | |
| #1973 | Birds RitualsTehran Regional 2021 | |
| #1974 | Black Family TreeTehran Regional 2021 | |
| #1975 | Vaccination Against CoronaTehran Regional 2021 | |
| #1976 | McFlyTehran Regional 2021 | |
| #1977 | The Last SupperTehran Regional 2021 | |
| #1978 | Stabbing NumberTehran Regional 2021 | |
| #1979 | GratitudeSWERC 2020 | |
| #1980 | Rule 110SWERC 2020 | |
| #1981 | Safe DistanceSWERC 2020 | |
| #1982 | JoggingSWERC 2020 | |
| #1983 | CakesSWERC 2020 | |
| #1984 | MentorsSWERC 2020 | |
| #1985 | DecorationSWERC 2020 | |
| #1986 | FigurinesSWERC 2020 | |
| #1987 | EmailsSWERC 2020 | |
| #1988 | Daisy's MazesSWERC 2020 | |
| #1989 | Unique ActivitiesSWERC 2020 | |
| #1990 | RestaurantsSWERC 2020 | |
| #1991 | FantasmagorieSWERC 2020 | |
| #1992 | DelegationUSACO 2020 February Platinum | |
| #1993 | Equilateral TrianglesUSACO 2020 February Platinum | |
| #1994 | Help YourselfUSACO 2020 February Platinum | |
| #1995 | Sprinklers 2: Return of the AlfalfaUSACO 2020 US Open Platinum | |
| #1996 | ExerciseUSACO 2020 US Open Platinum | |
| #1997 | CircusUSACO 2020 US Open Platinum | |
| #1998 | Sleeping CowsUSACO 2020 December Platinum | |
| #1999 | SpaceshipUSACO 2020 December Platinum | |
| #2000 | CowmistryUSACO 2020 December Platinum | |