| 2819 | 5103 传纸条 | 1 | 1 | 100.000% |
| 2820 | I-country | 0 | 0 | 0.000% |
| 2821 | 5105 Cookies | 0 | 0 | 0.000% |
| 2822 | 5201 数字组合 | 2 | 7 | 28.571% |
| 2823 | 5202 自然数拆分Lunatic版 | 0 | 1 | 0.000% |
| 2824 | Jury Compromise | 0 | 0 | 0.000% |
| 2825 | Coins | 0 | 0 | 0.000% |
| 2826 | Polygon | 0 | 0 | 0.000% |
| 2827 | 5302 金字塔 | 0 | 0 | 0.000% |
| 2828 | 5401 没有上司的舞会 | 20 | 26 | 76.923% |
| 2829 | 5301 石子合并 | 17 | 31 | 54.839% |
| 2830 | 5402 选课 | 0 | 0 | 0.000% |
| 2831 | Accumulation Degree | 0 | 0 | 0.000% |
| 2832 | Naptime | 0 | 0 | 0.000% |
| 2833 | Naptime | 0 | 0 | 0.000% |
| 2834 | 5501 环路运输 | 0 | 0 | 0.000% |
| 2835 | Mondriaan's Dream | 0 | 0 | 0.000% |
| 2836 | 炮兵阵地 | 0 | 0 | 0.000% |
| 2837 | 5701 开车旅行 | 0 | 2 | 0.000% |
| 2838 | 5702 Count The Repetitions | 0 | 0 | 0.000% |
| 2839 | Cleaning Shifts | 1 | 1 | 100.000% |
| 2840 | The Battle of Chibi | 0 | 0 | 0.000% |
| 2841 | USACO2021月赛1月份铜级第一题 - Uddered but not Herd | 35 | 69 | 50.725% |
| 2842 | 堆排序 heapsort [3*] | 78 | 108 | 72.222% |
| 2843 | USACO 2021 January Contest, Bronze Even More Odd Photos | 1 | 7 | 14.286% |
| 2844 | 蜜蜂路线 （bee） [1*+] | 3 | 2 | 150.000% |
| 2845 | 王小二切饼 | 17 | 40 | 42.500% |
| 2846 | 【动态规划】最长不下降子序列 | 206 | 260 | 79.231% |
| 2847 | ABC-179-A -- Plural Form | 6 | 11 | 54.545% |
| 2848 | ABC175A - Rainy Seasoon | 7 | 8 | 87.500% |
| 2849 | ABC173A - Payment | 2 | 2 | 100.000% |
| 2850 | ABC173B - Judge Status Summary | 6 | 13 | 46.154% |
| 2851 | USACO2020Jan - Word Processor | 6 | 10 | 60.000% |
| 2852 | USACO2019Dec - Silver3 - Milk Visits | 6 | 25 | 24.000% |
| 2853 | ABC170A - Five Variables | 1 | 1 | 100.000% |
| 2854 | ABC167A - Registration | 0 | 0 | 0.000% |
| 2855 | 图的遍历 | 40 | 80 | 50.000% |
| 2856 | ABC188A- Three-Point Shot | 12 | 23 | 52.174% |
| 2857 | ABC126A - Changing a Character | 0 | 0 | 0.000% |
| 2858 | ABC126B - YYMM or MMYY | 10 | 17 | 58.824% |
| 2859 | ABC128A - Apple Pie | 9 | 11 | 81.818% |
| 2860 | ABC129A - Airplane | 2 | 4 | 50.000% |
| 2861 | ABC149B Greedy Takahashi | 1 | 1 | 100.000% |
| 2862 | ABC149C - Next Prime | 4 | 4 | 100.000% |
| 2863 | ABC149D - Prediction and Restriction | 0 | 0 | 0.000% |
| 2864 | ABC151A - Next Alphabet | 4 | 5 | 80.000% |
| 2865 | ABC149A - Concatenating Strings | 4 | 4 | 100.000% |
| 2866 | 图的m着色问题 | 2 | 2 | 100.000% |
| 2867 | 【递归】二分查找 | 32 | 65 | 49.231% |
| 2868 | 【DP】最长公共子序列 LCS加强版 | 10 | 22 | 45.455% |