Codeforces
난이도 체계 비교
- 솔브드 레이팅이 매겨진 문제들만 샘플링
- Hello 2020 (https://codeforces.com/contest/1284)
| New Year and Naming |  | *800 |
| New Year and Ascent Sequence |  | *1400 |
| New Year and Permutation |  | *1600 |
| New Year and Conference |  | *2100 |
| New Year and Castle Construction |  | *2500 |
| New Year and Social Network |  | *3200 |
| Seollal | | *3300 |
- Codeforces Round 620 (Div. 2) (https://codeforces.com/contest/1304)
| Two Rabbits | | *800 |
| Longest Palindrome |  | *1100 |
| Air Conditioner |  | *1500 |
| Shortest and Longest LIS |  | *1800 |
| 1-Trees and Queries |  | *2000 |
| Animal Observation (easy version) |  | *2300 |
| Animal Observation (hard version) |  | *2400 |
- Codeforces Round 688 (Div. 2) (https://codeforces.com/contest/1453)
| Cancel the Trains |  | *800 |
| Suffix Operations | | *1400 |
| Triangles | | *1700 |
| Checkpoints |  | *1900 |
| Dog Snacks | | *2300 |
| Even Harder |  | *2700 |