| problem_set_id,start_at,end_at | |
| 1143044113704902656,2019-06-25 08:00:00,2019-06-25 11:00:00 | |
| 1143048762595958784,2019-06-24 14:48:00,2019-06-24 15:20:00 | |
| 1143056777034293248,2019-06-24 15:30:00,2019-06-24 15:38:00 | |
| 1143059418644701184,2019-06-24 15:36:00,2019-06-24 15:42:00 | |
| 1192267510399143936,2019-11-07 10:26:00,2020-01-02 14:48:00 | |
| 1192328068016156672,2019-11-07 14:28:00,2020-01-06 18:13:00 | |
| 1192328340763348992,2019-11-07 14:29:00,2020-01-02 09:55:00 | |
| 1210151988942553088,2019-12-26 19:00:00,2019-12-26 21:54:00 | |
| 1210940105005940736,2019-12-29 14:15:00,2019-12-29 16:15:00 | |
| 1329278371661205504,2020-11-19 12:19:00,2021-11-11 14:19:00 | |
| 1352252229258104832,2021-01-21 21:50:00,2021-01-21 23:50:00 | |
| 1496025180408197120,2022-02-22 14:48:00,2022-03-01 23:59:00 | |
| 1496033828240961536,, | |
| 1496035714194227200,, | |
| 1496036661598683136,2022-03-01 14:00:00,2022-03-08 23:59:00 | |
| 1496331271864647680,2022-02-23 11:50:00,2022-03-01 23:59:00 | |
| 1496334543433838592,2022-02-23 12:05:00,2022-03-01 23:59:00 | |
| 1499320080440365056,2022-03-03 17:45:00,2023-02-03 19:45:00 | |
| 1509096142468583424,, | |
| 1509403764145614848,2022-03-31 13:34:00,2022-04-03 23:59:00 | |
| 1512066802136522752,2022-04-07 21:55:00,2022-04-30 23:55:00 | |
| 1513776255925395456,2022-04-12 15:24:00,2022-04-17 23:59:00 | |
| 1514814139867029504,, | |
| 1514820451338248192,, | |
| 1514821715157540864,2022-04-15 12:23:00,2022-04-22 14:30:00 | |
| 1514851325225639936,, | |
| 1514861396142485504,2022-04-15 15:08:00,2022-04-17 23:59:00 | |
| 1514867610344923136,2022-04-15 15:23:00,2022-04-15 23:59:00 | |
| 1514893472904409088,, | |
| 1514944576360194048,2022-04-15 20:31:00,2022-05-10 22:31:00 | |
| 1515537428570861568,, | |
| 1516239593111187456,2022-04-19 11:40:00,2022-04-24 23:59:00 | |
| 1517131484832886784,, | |
| 1517135577820602368,2022-04-22 14:40:00,2022-04-22 18:30:00 | |
| 1517321945309945856,2022-04-27 08:05:00,2022-05-06 23:59:00 | |
| 1518064829649367040,2022-04-24 11:09:00,2022-04-25 10:09:00 | |
| 1518964296728465408,2022-04-28 00:43:00,2022-04-28 23:43:00 | |
| 1519218892105326592,2022-04-28 00:00:00,2022-04-29 00:00:00 | |
| 1519222593943511040,2022-04-27 15:50:00,2022-04-28 15:50:00 | |
| 1519223657363165184,2022-04-27 15:54:00,2022-04-27 19:54:00 | |
| 1519225268856696832,2022-04-28 07:00:00,2022-04-28 23:59:00 | |
| 1519281896654131200,2022-04-28 08:45:00,2022-04-28 23:55:00 | |
| 1519486773112090624,2022-04-29 14:45:00,2022-04-29 18:40:00 | |
| 1519513023398551552,2022-04-28 11:04:00,2022-04-28 23:55:00 | |
| 1519595380386316288,2022-04-28 16:31:00,2022-04-28 23:59:00 | |
| 1519718294938996736,2022-04-29 16:00:00,2022-04-29 18:10:00 | |
| 1519827607124725760,2022-04-29 19:00:00,2022-04-29 21:00:00 | |
| 1519829650623188992,2022-04-29 19:00:00,2022-04-29 21:00:00 | |
| 1519853522869297152,2022-04-29 16:30:00,2022-04-29 18:10:00 | |
| 1519855039923892224,2022-04-29 19:15:00,2022-04-29 20:55:00 | |
| 1519867617169383424,2022-04-29 10:33:00,2022-04-29 12:33:00 | |
| 1519868321695023104,2022-04-29 16:30:00,2022-04-29 18:10:00 | |
| 1519869908207288320,2022-04-29 19:15:00,2022-04-29 20:55:00 | |
| 1519897068892606464,2022-04-29 12:30:00,2022-04-29 23:30:00 | |
| 1519914597551714304,2022-04-29 14:40:00,2022-04-29 18:20:00 | |
| 1519922036233752576,2022-04-29 14:24:00,2022-04-29 23:59:00 | |
| 1519980784516157440,2022-04-29 18:05:00,2022-05-04 23:59:00 | |
| 1521072756161085440,2022-05-02 18:30:00,2022-05-02 22:21:00 | |
| 1527544536027803648,2022-05-20 14:58:00,2022-06-27 16:58:00 | |
| 1536977225273569280,2022-06-15 15:54:00,2022-06-23 23:59:00 | |