| #2801 | RoundingSWERC 2018 | |
| #2802 | Paris by NightSWERC 2018 | |
| #2803 | StringsSWERC 2018 | |
| #2804 | Travel GuideSWERC 2018 | |
| #2805 | Mason's MarkSWERC 2018 | |
| #2806 | Mona LisaSWERC 2018 | |
| #2807 | Dishonest DriverSWERC 2018 | |
| #2808 | GardeningRMI 2021 Day 1 | |
| #2809 | PresentRMI 2021 Day 1 | |
| #2810 | SpeedrunRMI 2021 Day 1Communication | |
| #2811 | NoMRMI 2021 Day 2 | |
| #2812 | PathsRMI 2021 Day 2 | |
| #2813 | WeirdtreeRMI 2021 Day 2Interactive | |
| #2814 | 不用找的树THUPC 2019 | |
| #2815 | 组合数据结构问题THUPC 2019 | |
| #2816 | 过河卒二THUPC 2019 | |
| #2817 | 鸽鸽的分割THUPC 2019 | |
| #2818 | 能量波THUPC 2019 | |
| #2819 | 摆家具THUPC 2019 | |
| #2820 | 令人难以忘记的题目名称THUPC 2019 | |
| #2821 | 鸭棋THUPC 2019 | |
| #2822 | 不等式THUPC 2019 | |
| #2823 | 改善生活THUPC 2019 | |
| #2824 | 找树THUPC 2019 | |
| #2825 | 大碗宽面THUPC 2019 | |
| #2826 | 历史行程THUPC 2019 | |
| #2827 | AutobiographyCCPC Final 2020 | |
| #2828 | AlgebraCCPC Final 2020 | |
| #2829 | CryptographyCCPC Final 2020 | |
| #2830 | Data StructureCCPC Final 2020 | |
| #2831 | Game TheoryCCPC Final 2020 | |
| #2832 | Graph TheoryCCPC Final 2020 | |
| #2833 | HamiltonCCPC Final 2020 | |
| #2834 | NonsenseCCPC Final 2020 | |
| #2835 | Number TheoryCCPC Final 2020 | |
| #2836 | Permutation PatternCCPC Final 2020 | |
| #2837 | StringologyCCPC Final 2020 | |
| #2838 | 2D GeometryCCPC Final 2020 | |
| #2839 | 3D GeometryCCPC Final 2020 | |
| #2840 | 绿绿与串串THUPC 2018 | |
| #2841 | 赛艇THUPC 2018 | |
| #2842 | 好图计数THUPC 2018 | |
| #2843 | 《算法与数据结构》小助教招募通知THUPC 2018 | |
| #2844 | 淘米神的树THUPC 2018 | |
| #2845 | 密码学第三次小作业THUPC 2018 | |
| #2846 | 琪亚娜之墙THUPC 2018 | |
| #2847 | 组合数问题THUPC 2018 | |
| #2848 | 城市地铁规划THUPC 2018 | |
| #2849 | 弗雷兹的玩具商店THUPC 2018 | |
| #2850 | 蛋糕THUPC 2018 | |
| #2851 | 生生不息THUPC 2018 | |
| #2852 | 为最美的那位献上花朵THUPC 2018 | |
| #2853 | Paint by RectanglesUSACO 2022 February Platinum | |
| #2854 | Sleeping in ClassUSACO 2022 February Platinum | |
| #2855 | Phone NumbersUSACO 2022 February Platinum | |
| #2856 | 数字表格SDOI 2017 Round 1 Day 1 | |
| #2857 | 树点涂色SDOI 2017 Round 1 Day 1 | |
| #2858 | 序列计数SDOI 2017 Round 1 Day 1 | |
| #2859 | 新生舞会SDOI 2017 Round 1 Day 2 | |
| #2860 | 硬币游戏SDOI 2017 Round 1 Day 2 | |
| #2861 | 相关分析SDOI 2017 Round 1 Day 2 | |
| #2862 | 龙与地下城SDOI 2017 Round 2 Day 1 | |
| #2863 | 苹果树SDOI 2017 Round 2 Day 1 | |
| #2864 | 切树游戏SDOI 2017 Round 2 Day 1 | |
| #2865 | 天才黑客SDOI 2017 Round 2 Day 2 | |
| #2866 | 遗忘的集合SDOI 2017 Round 2 Day 2 | |
| #2867 | 文本校正SDOI 2017 Round 2 Day 2 | |
| #2868 | Preparing a contest | |
| #2869 | Anno Domini 2022NWRRC 2021 | |
| #2870 | Boris and BertaNWRRC 2021 | |
| #2871 | Clean Up!NWRRC 2021 | |
| #2872 | Day StreakNWRRC 2021 | |
| #2873 | Extreme ProblemNWRRC 2021 | |
| #2874 | First to SolveNWRRC 2021 | |
| #2875 | Grand CenterNWRRC 2021 | |
| #2876 | Halfway ThereNWRRC 2021 | |
| #2877 | Imprecise Permutation SortNWRRC 2021Interactive | |
| #2878 | Journey in FogNWRRC 2021 | |
| #2879 | Kaleidoscopic RouteNWRRC 2021 | |
| #2880 | Letters Q and FNWRRC 2021 | |
| #2881 | Multithreaded ProgramNWRRC 2021 | |
| #2882 | New White-Black TreeNWRRC 2021 | |
| #2883 | 方格游戏THUPC 2021 初赛 | |
| #2884 | 切切糕THUPC 2021 初赛 | |
| #2885 | 非欧几何THUPC 2021 初赛 | |
| #2886 | 区间众数THUPC 2021 初赛Ynoi 2008 | |
| #2887 | 区间矩阵乘法THUPC 2021 初赛 | |
| #2888 | 棋盘THUPC 2021 初赛 | |
| #2889 | 密集子图THUPC 2021 初赛 | |
| #2890 | 线段树THUPC 2021 初赛 | |
| #2891 | 狗蛋和二五仔THUPC 2021 初赛 | |
| #2892 | 合法序列THUPC 2021 初赛 | |
| #2893 | 独立THUPC 2021 初赛 | |
| #2894 | 麻将模拟器THUPC 2021 初赛 | |
| #2895 | 自白书THUPC 2021 初赛 | |
| #2896 | Black and WhiteSoutheast USA Regional 2021South Central USA Regional 2021Pacific Northwest Regional 2021Mid-Central USA Regional 2021 | |
| #2897 | Circle BounceSoutheast USA Regional 2021South Central USA Regional 2021Pacific Northwest Regional 2021Northeast North America Regional 2021 | |
| #2898 | DiagonalsSoutheast USA Regional 2021South Central USA Regional 2021Pacific Northwest Regional 2021Northeast North America Regional 2021Mid-Central USA Regional 2021 | |
| #2899 | Dorm Room DivideSoutheast USA Regional 2021South Central USA Regional 2021Pacific Northwest Regional 2021Northeast North America Regional 2021Mid-Central USA Regional 2021 | |
| #2900 | Fail Them All!Southeast USA Regional 2021South Central USA Regional 2021Pacific Northwest Regional 2021Northeast North America Regional 2021Mid-Central USA Regional 2021 | |