| Platinum 3문제 expand_more |
| 4081 | Balance Beam | USACO 2018 December Platinum | 1 | 15 | 6.67% |
| 4082 | Sort It Out | USACO 2018 December Platinum | 0 | 0 | |
| 4083 | The Cow Gathering | USACO 2018 December Platinum | 0 | 0 | |
| Gold 3문제 expand_more |
 4084 | Fine Dining | USACO 2018 December Gold | 1 | 1 | 100.00% |
| 4085 | Cowpatibility | USACO 2018 December Gold | 0 | 0 | |
 4086 | Teamwork | USACO 2018 December Gold | 3 | 8 | 37.50% |
| Silver 3문제 expand_more |
| 4087 | Convention | USACO 2018 December Silver | 0 | 0 | |
 4088 | Convention II | USACO 2018 December Silver | 1 | 1 | 100.00% |
| 4089 | Mooyo Mooyo | USACO 2018 December Silver | 0 | 0 | |
| Bronze 3문제 expand_more |
| 4090 | Mixing Milk | USACO 2018 December Bronze | 1 | 1 | 100.00% |
| 4091 | The Bucket List | USACO 2018 December Bronze | 1 | 1 | 100.00% |
| 4092 | Back and Forth | USACO 2018 December Bronze | 0 | 0 | |
