| 2020年北京青少年信息学科普日市级活动（初中组）题解 | EntropyIncreaser | 2020-11-05 13:06:37 |
| BJ United Round #4 （Mirror of Haidian 2019）题解 | EntropyIncreaser | 2019-09-21 12:46:51 |
| BJ United Round #4 （Mirror of Haidian 2019） | duluchutiren | 2019-09-16 19:28:14 |
| BJ United Round #3 题解 | EntropyIncreaser | 2019-09-07 18:00:27 |
| BJ United Round #3 | EntropyIncreaser | 2019-09-04 10:30:06 |
| 求开 #12 的 hack | ouuan | 2019-08-11 22:56:41 |
| BJ United Round #2 题解 | HHzzkk | 2019-08-07 23:00:18 |
| BJ United Round #2 | HHzzkk | 2019-08-05 12:46:23 |
| BJ United Round #1 题解 | EntropyIncreaser | 2019-07-31 22:31:20 |
| BJ United Round #1 | EntropyIncreaser | 2019-07-30 12:58:50 |
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