| #2901 | Hopscotch 500Southeast USA Regional 2021South Central USA Regional 2021Pacific Northwest Regional 2021Northeast North America Regional 2021 | |
| #2902 | Shortest Missing SubsequencesSoutheast USA Regional 2021South Central USA Regional 2021Pacific Northwest Regional 2021Northeast North America Regional 2021 | |
| #2903 | Tetris GenerationSoutheast USA Regional 2021South Central USA Regional 2021Pacific Northwest Regional 2021Northeast North America Regional 2021Mid-Central USA Regional 2021 | |
| #2904 | Tournament SeedingSoutheast USA Regional 2021South Central USA Regional 2021Pacific Northwest Regional 2021 | |
| #2905 | Tree HoppingSoutheast USA Regional 2021South Central USA Regional 2021Pacific Northwest Regional 2021Northeast North America Regional 2021Mid-Central USA Regional 2021 | |
| #2906 | XOR IslandSoutheast USA Regional 2021South Central USA Regional 2021Pacific Northwest Regional 2021Northeast North America Regional 2021Mid-Central USA Regional 2021 | |
| #2907 | Average CharacterSoutheast USA Regional 2021South Central USA Regional 2021Mid-Central USA Regional 2021 | |
| #2908 | Double PasswordSoutheast USA Regional 2021South Central USA Regional 2021Pacific Northwest Regional 2021Northeast North America Regional 2021 | |
| #2909 | OverdraftSoutheast USA Regional 2021South Central USA Regional 2021Mid-Central USA Regional 2021 | |
| #2910 | Rise and FallSoutheast USA Regional 2021South Central USA Regional 2021Pacific Northwest Regional 2021Northeast North America Regional 2021 | |
| #2911 | Square BounceSoutheast USA Regional 2021South Central USA Regional 2021Pacific Northwest Regional 2021 | |
| #2912 | Who Goes There?Southeast USA Regional 2021South Central USA Regional 2021Mid-Central USA Regional 2021 | |
| #2913 | Archery AccuracyPacific Northwest Regional 2021 | |
| #2914 | Problem Set ConstructionPacific Northwest Regional 2021Northeast North America Regional 2021Mid-Central USA Regional 2021 | |
| #2915 | Reversibly Cyclic StringsPacific Northwest Regional 2021 | |
| #2916 | Scaling RecipePacific Northwest Regional 2021 | |
| #2917 | Even SubstringsNorth Central NA Regional 2021Mid-Atlantic USA Regional 2021 | |
| #2918 | Tree Number GeneratorNorth Central NA Regional 2021Mid-Atlantic USA Regional 2021 | |
| #2919 | SubprimeNorth Central NA Regional 2021Mid-Atlantic USA Regional 2021 | |
| #2920 | Ultimate Binary WatchNorth Central NA Regional 2021Mid-Atlantic USA Regional 2021 | |
| #2921 | Land EqualityNorth Central NA Regional 2021Mid-Atlantic USA Regional 2021 | |
| #2922 | Word PuzzleNorth Central NA Regional 2021Mid-Atlantic USA Regional 2021 | |
| #2923 | Code GuessingNorth Central NA Regional 2021Mid-Atlantic USA Regional 2021 | |
| #2924 | Lone RookNorth Central NA Regional 2021Mid-Atlantic USA Regional 2021 | |
| #2925 | Parking LotNorth Central NA Regional 2021Mid-Atlantic USA Regional 2021 | |
| #2926 | Stream LagNorth Central NA Regional 2021Mid-Atlantic USA Regional 2021 | |
| #2927 | Bracket PairingNorth Central NA Regional 2021Mid-Atlantic USA Regional 2021 | |
| #2928 | Espresso!North Central NA Regional 2021Mid-Atlantic USA Regional 2021 | |
| #2929 | Concert RehearsalNorth Central NA Regional 2021Mid-Atlantic USA Regional 2021 | |
| #2930 | Football ScoringGreater New York Regional 2021 | |
| #2931 | Tri-Color PuzzleGreater New York Regional 2021 | |
| #2932 | Checker SlideGreater New York Regional 2021 | |
| #2933 | Sequinary NumeralsGreater New York Regional 2021 | |
| #2934 | How Many Unicycles in a Broken WheelGreater New York Regional 2021 | |
| #2935 | Spider-FlyGreater New York Regional 2021 | |
| #2936 | Simple Collatz SequenceGreater New York Regional 2021 | |
| #2937 | CIDRGreater New York Regional 2021 | |
| #2938 | Three Spheres and a TetrahedronGreater New York Regional 2021 | |
| #2939 | Morse Code PalindromesGreater New York Regional 2021 | |
| #2940 | Pooling PCR TestsGreater New York Regional 2021 | |
| #2941 | LetterleGreater New York Regional 2021 | |
| #2942 | 7 Segments You Say?Greater New York Regional 2021 | |
| #2943 | NeighborsGreater New York Regional 2021 | |
| #2944 | Transporting SpaghettiGreater New York Regional 2021 | |
| #2945 | 1's For AllEast Central NA Regional 2021 | |
| #2946 | Abridged ReadingEast Central NA Regional 2021 | |
| #2947 | Ball of WhacksEast Central NA Regional 2021 | |
| #2948 | DownsizingEast Central NA Regional 2021 | |
| #2949 | Gambling GameEast Central NA Regional 2021 | |
| #2950 | Growing Some OobleckEast Central NA Regional 2021 | |
| #2951 | Noonerized SpumbersEast Central NA Regional 2021 | |
| #2952 | NumbleEast Central NA Regional 2021 | |
| #2953 | Pinned FilesEast Central NA Regional 2021 | |
| #2954 | RecyclingEast Central NA Regional 2021 | |
| #2955 | Stable TableEast Central NA Regional 2021 | |
| #2956 | StatuesEast Central NA Regional 2021 | |
| #2957 | Tomb HaterEast Central NA Regional 2021 | |
| #2958 | BettingRocky Mountain Regional 2021 | |
| #2959 | AntialiasingRocky Mountain Regional 2021 | |
| #2960 | Social DistancingRocky Mountain Regional 2021 | |
| #2961 | Pawn ShopRocky Mountain Regional 2021 | |
| #2962 | Election ParadoxRocky Mountain Regional 2021 | |
| #2963 | Protect the Pollen!Rocky Mountain Regional 2021 | |
| #2964 | Loot ChestRocky Mountain Regional 2021 | |
| #2965 | RSA MistakeRocky Mountain Regional 2021 | |
| #2966 | Slide CountRocky Mountain Regional 2021 | |
| #2967 | Snowball FightRocky Mountain Regional 2021 | |
| #2968 | Team ChangeRocky Mountain Regional 2021 | |
| #2969 | Ticket Completed?Rocky Mountain Regional 2021 | |
| #2970 | Trade RoutesRocky Mountain Regional 2021 | |
| #2971 | Wordle with FriendsRocky Mountain Regional 2021 | |
| #2972 | 与或和GXOI 2019GZOI 2019 | |
| #2973 | 宝牌一大堆GXOI 2019GZOI 2019 | |
| #2974 | 特技飞行GXOI 2019GZOI 2019 | |
| #2975 | 逼死强迫症GXOI 2019GZOI 2019 | |
| #2976 | 旅行者GXOI 2019GZOI 2019 | |
| #2977 | 旧词GXOI 2019GZOI 2019 | |
| #2978 | 二进制BJOI 2018 Day 1 | |
| #2979 | 染色BJOI 2018 Day 1 | |
| #2980 | 求和BJOI 2018 Day 1 | |
| #2981 | 双人猜数游戏BJOI 2018 Day 2Output Only | |
| #2982 | 链上二次求和BJOI 2018 Day 2 | |
| #2983 | 治疗之雨BJOI 2018 Day 2 | |
| #2984 | 奇怪的背包HAOI 2018 Round 1 | |
| #2985 | 反色游戏HAOI 2018 Round 1 | |
| #2986 | 字串覆盖HAOI 2018 Round 1 | |
| #2987 | 苹果树HAOI 2018 Round 2 | |
| #2988 | 染色HAOI 2018 Round 2 | |
| #2989 | 一双木棋联合省选 2018 | |
| #2990 | IIIDX联合省选 2018 | |
| #2991 | 秘密袭击联合省选 2018 | |
| #2992 | 劈配联合省选 2018 | |
| #2993 | 林克卡特树联合省选 2018 | |
| #2994 | 制胡窜联合省选 2018 | |
| #2995 | 异或粽子联合省选 2019 | |
| #2996 | 字符串问题联合省选 2019 | |
| #2997 | 骗分过样例联合省选 2019 | |
| #2998 | 皮配联合省选 2019 | |
| #2999 | 春节十二响联合省选 2019 | |
| #3000 | 希望联合省选 2019 | |