| problem_set_id,start_at,end_at | |
| 1393368576481865728,2021-05-15 08:51:00,2021-08-31 23:51:00 | |
| 1397813594811764736,2021-05-27 15:14:00,2021-08-18 23:00:00 | |
| 1411671966977376256,2021-08-17 10:01:00,2021-08-31 23:01:00 | |
| 1418107909588967424,2021-07-22 15:15:00,2021-08-23 23:15:00 | |
| 1419272778795073536,2021-08-24 10:00:00,2021-09-05 23:00:00 | |
| 1419930545566695424,2021-08-31 10:58:00,2021-09-14 23:30:00 | |
| 1420212611042762752,2021-09-07 10:39:00,2021-09-19 23:39:00 | |
| 1420251405540438016,2021-09-14 10:13:00,2021-09-28 23:13:00 | |
| 1420251755957706752,2021-09-21 11:15:00,2021-10-06 23:15:00 | |
| 1420252140688683008,2021-09-28 11:16:00,2021-10-10 15:16:00 | |
| 1420644210410614784,2021-07-29 15:14:00,2021-09-30 17:14:00 | |
| 1435547136449163264,2021-09-08 18:14:00,2021-09-08 21:14:00 | |
| 1437365091664572416,2021-09-14 18:30:00,2021-09-21 21:00:00 | |
| 1443845186976026624,2021-10-12 08:30:00,2021-10-19 23:45:00 | |
| 1447474802200809472,2021-10-12 08:30:00,2021-10-19 23:00:00 | |
| 1450684109827227648,2021-10-20 12:42:00,2021-10-24 23:42:00 | |
| 1570749455869870080,2022-10-05 20:19:00,2022-10-16 22:19:00 | |
| 1572075819017367552,2022-10-05 12:09:00,2022-10-24 23:09:00 | |
| 1572079360582987776,2022-10-14 06:22:00,2022-10-28 23:22:00 | |
| 1574326382048423936,2022-09-26 17:13:00,2022-09-30 19:13:00 | |
| 1578386577054941184,2022-10-07 22:07:00,2022-10-08 00:07:00 | |
| 1580356583028420608,2022-10-17 08:35:00,2022-10-22 10:35:00 | |
| 1581460302432296960,2022-10-16 09:41:00,2022-10-16 11:41:00 | |
| 1583735520270106624,, | |
| 1584250325460467712,2022-10-23 23:59:00,2022-10-30 23:59:00 | |