| Platinum 3문제 expand_more |
 5771 | United Cows of Farmer John | USACO 2021 US Open Platinum | 1 | 5 | 20.00% |
| 5770 | Routing Schemes | USACO 2021 US Open Platinum | 0 | 0 | |
| 5769 | Balanced Subsets | USACO 2021 US Open Platinum | 1 | 1 | 100.00% |
| Gold 3문제 expand_more |
 5768 | United Cows of Farmer John | USACO 2021 US Open Gold | 2 | 3 | 66.67% |
 5767 | Portals | | 1 | 1 | 100.00% |
| 5766 | Permutation | USACO 2021 US Open Gold | 0 | 0 | |
| Silver 3문제 expand_more |
| 5765 | Maze Tac Toe | | 0 | 0 | |
| 5764 | ABC 어렵게 맞추기 (Do You Know Your ABCs?) | USACO 2021 US Open Silver | 0 | 0 | |
| 5763 | Acowdemia | USACO 2021 US Open Silver | 0 | 0 | |
| Bronze 3문제 expand_more |
 5357 | 학문 I (Acowdemia I) | USACO 2021 US Open Bronze | 9 | 33 | 27.27% |
 5358 | 학문 II (Acowdemia II) | USACO 2021 US Open Bronze | 7 | 9 | 77.78% |
 5359 | 학문 III (Acowdemia III) | USACO 2021 US Open Bronze | 4 | 11 | 36.36% |
