Timeline:

2021/02/23: Joined dmoj
2021/02/23: Solved first problem
2021/02/23: Solved 50-pointer
2021/02/23: Solved 30-pointer
2021/02/23: Solved 25-pointer
2021/02/23: 100 points
2021/02/23: Solved 20-pointer
2021/02/23: Top 2000
2021/02/23: Solved 5-pointer
2021/02/23: Solved 7-pointer
2021/02/23: Solved 1-pointer
2021/02/24: 200 points
2021/02/24: Solved 15 problems
2021/02/25: Solved 25 problems
2021/02/26: Top 1000