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- 14:02, 7 August 2019 diff hist +2 2019 Multi-University,HDU Day 7 →Problem B
- 14:01, 7 August 2019 diff hist -3 2019 Multi-University,HDU Day 7 →Problem B
- 14:00, 7 August 2019 diff hist +3 2019 Multi-University,HDU Day 7 →Problem A
- 14:00, 7 August 2019 diff hist -18 2019 Multi-University,HDU Day 7 →Problem B
- 14:00, 7 August 2019 diff hist -1 2019 Multi-University,HDU Day 7 →Problem B
- 13:59, 7 August 2019 diff hist +16 2019 Multi-University,HDU Day 7 →Problem B
- 13:57, 7 August 2019 diff hist +1 2019 Multi-University,HDU Day 7 →Problem K
- 13:57, 7 August 2019 diff hist +611 2019 Multi-University,HDU Day 7 →Problem K
- 13:46, 7 August 2019 diff hist -4 2019 Multi-University,HDU Day 7 →Problem A
- 13:46, 7 August 2019 diff hist +175 2019 Multi-University,HDU Day 7 →Problem A
- 13:41, 7 August 2019 diff hist +329 2019 Multi-University,HDU Day 7 →Problem F
- 13:38, 7 August 2019 diff hist +1 2019 Multi-University,HDU Day 7 →Problem A
- 13:37, 7 August 2019 diff hist 0 2019 Multi-University,HDU Day 6 →Problem L
- 14:51, 5 August 2019 diff hist -3 2019 Multi-University,Nowcoder Day 5 →Problem D
- 14:51, 5 August 2019 diff hist +9 2019 Multi-University,Nowcoder Day 5 →Problem D
- 14:51, 5 August 2019 diff hist 0 2019 Multi-University,Nowcoder Day 5 →Problem D
- 14:50, 5 August 2019 diff hist +4 2019 Multi-University,Nowcoder Day 5 →Problem D
- 14:49, 5 August 2019 diff hist +83 2019 Multi-University,Nowcoder Day 5 →Problem D
- 14:48, 5 August 2019 diff hist +524 2019 Multi-University,Nowcoder Day 5 →Problem D
- 14:28, 5 August 2019 diff hist +60 2019 Multi-University,Nowcoder Day 5 →Problem D