| #21201 | Space ExplorationUSACO 2011 January Bronze | |
| #21202 | Crop CirclesUSACO 2011 January Bronze | |
| #21203 | ProfitsUSACO 2011 January Silver | |
| #21204 | Dividing the GoldUSACO 2011 January Silver | |
| #21205 | Traffic LightsUSACO 2011 January Silver | |
| #21206 | BottleneckUSACO 2011 January Gold | |
| #21207 | The Continental CowngressUSACO 2011 January Gold | |
| #21208 | Roads and PlanesUSACO 2011 January Gold | |
| #21209 | Cow CotillionUSACO 2011 February Bronze | |
| #21210 | Cow TreatsUSACO 2011 February Bronze | |
| #21211 | Hexagonal Pasture NetworkUSACO 2011 February Bronze | |
| #21212 | Cow LineUSACO 2011 February Silver | |
| #21213 | Best ParenthesisUSACO 2011 February Silver | |
| #21214 | The TriangleUSACO 2011 February Silver | |
| #21215 | CowlphabetUSACO 2011 February Gold | |
| #21216 | The Lost CowsUSACO 2011 February Gold | |
| #21217 | Generic Cow ProtestsUSACO 2011 February Gold | |
| #21218 | Lucky CharmsUSACO 2011 March Bronze | |
| #21219 | PathfindingUSACO 2011 March Bronze | |
| #21220 | A spiral walkUSACO 2011 March Bronze | |
| #21221 | Meeting PlaceUSACO 2011 March Silver | |
| #21222 | Package DeliveryUSACO 2011 March Silver | |
| #21223 | Bovine Bridge BattleUSACO 2011 March Silver | |
| #21224 | Brownie SlicingUSACO 2011 March Gold | |
| #21225 | Graph DiscoveryUSACO 2011 March Gold | |
| #21226 | Tree DecorationUSACO 2011 March Gold | |
| #21227 | The Bovine Fire DrillUSACO 2011 US Open Bronze | |
| #21228 | Skewed SortingUSACO 2011 US Open Bronze | |
| #21229 | 3D Space ExplorationUSACO 2011 US Open Bronze | |
| #21230 | String Function EncodingUSACO 2011 US Open Bronze | |
| #21231 | Corn MazeUSACO 2011 US Open Silver | |
| #21232 | Cow CheckersUSACO 2011 US Open Silver | |
| #21233 | Forgotten PasswordUSACO 2011 US Open Silver | |
| #21234 | Learning LanguagesUSACO 2011 US Open Silver | |
| #21235 | Mowing the LawnUSACO 2011 US Open Gold | |
| #21236 | Odd degreesUSACO 2011 US Open Gold | |
| #21237 | SolderingUSACO 2011 US Open Gold | |
| #21238 | Contest TimingUSACO 2011 November Bronze | |
| #21239 | Awkward DigitsUSACO 2011 November Bronze | |
| #21240 | Moo SickUSACO 2011 November Bronze | |
| #21241 | Cow Beauty Pageant (Bronze Level)USACO 2011 November Bronze | |
| #21242 | Cow Beauty Pageant (Silver Level)USACO 2011 November Silver | |
| #21243 | Cow LineupUSACO 2011 November Silver | |
| #21244 | Tile ExchangingUSACO 2011 November Silver | |
| #21245 | Above the MedianUSACO 2011 November Gold | |
| #21246 | Binary SudokuUSACO 2011 November Gold | |
| #21247 | Cow SteeplechaseUSACO 2011 November Gold | |
| #21248 | Hay BalesUSACO 2011 December Bronze | |
| #21249 | Cow Photography (Bronze Level)USACO 2011 December Bronze | |
| #21250 | Escaping the FarmUSACO 2011 December Bronze | |
| #21251 | Cow PhotographyUSACO 2011 December Silver | |
| #21252 | RoadblockUSACO 2011 December Silver | |
| #21253 | Umbrellas for CowsUSACO 2011 December Silver | |
| #21254 | Cow PhotographyUSACO 2011 December Gold | |
| #21255 | Simplifying the FarmUSACO 2011 December Gold | |
| #21256 | Grass PlantingUSACO 2011 December Gold | |
| #21257 | GiftsUSACO 2012 January Bronze | |
| #21258 | Haybale StackingUSACO 2012 January Bronze | |
| #21259 | Grazing PatternsUSACO 2012 January Bronze | |
| #21260 | Delivery RouteUSACO 2012 January Silver | |
| #21261 | Bale ShareUSACO 2012 January Silver | |
| #21262 | Mountain ClimbingUSACO 2012 January Silver | |
| #21263 | Video Game CombosUSACO 2012 January Gold | |
| #21264 | Cow RunUSACO 2012 January Gold | |
| #21265 | Bovine AllianceUSACO 2012 January Gold | |
| #21266 | Rope FoldingUSACO 2012 February Bronze | |
| #21267 | Overplanting (Bronze)USACO 2012 February Bronze | |
| #21268 | MooUSACO 2012 February Bronze | |
| #21269 | Overplanting (Silver)USACO 2012 February Silver | |
| #21270 | Cow IDsUSACO 2012 February Silver | |
| #21271 | RelocationUSACO 2012 February Silver | |
| #21272 | Cow CouponsUSACO 2012 February Gold | |
| #21273 | SymmetryUSACO 2012 February Gold | |
| #21274 | Nearby CowsUSACO 2012 February Gold | |
| #21275 | Times 17USACO 2012 March Bronze | |
| #21276 | Connect the CowsUSACO 2012 March Bronze | |
| #21277 | Wrong DirectionsUSACO 2012 March Bronze | |
| #21278 | TractorUSACO 2012 March Silver | |
| #21279 | FlowerpotUSACO 2012 March Silver | |
| #21280 | LandscapingUSACO 2012 March Silver | |
| #21281 | Large BannerUSACO 2012 March Gold | |
| #21282 | Haybale RestackingUSACO 2012 March Gold | |
| #21283 | Cows in a SkyscraperUSACO 2012 March Gold | |
| #21284 | Cows in a RowUSACO 2012 US Open Bronze | |
| #21285 | Three LinesUSACO 2012 US Open Bronze | |
| #21286 | IslandsUSACO 2012 US Open Bronze | |
| #21287 | Unlocking BlocksUSACO 2012 US Open Bronze | |
| #21288 | Unlocking Blocks (Silver)USACO 2012 US Open Silver | |
| #21289 | Bookshelf (Silver)USACO 2012 US Open Silver | |
| #21290 | Running LapsUSACO 2012 US Open Silver | |
| #21291 | Tied DownUSACO 2012 US Open Gold | |
| #21292 | BookshelfUSACO 2012 US Open Gold | |
| #21293 | Balanced Cow SubsetsUSACO 2012 US Open Gold | |
| #21294 | Find the Cow!USACO 2012 November Bronze | |
| #21295 | TypoUSACO 2012 November Bronze | |
| #21296 | HorseshoesUSACO 2012 November Bronze | |
| #21297 | Clumsy CowsUSACO 2012 November Silver | |
| #21298 | Distant PasturesUSACO 2012 November Silver | |
| #21299 | Balanced Cow BreedsUSACO 2012 November Silver | |
| #21300 | Balanced Cow BreedsUSACO 2012 November Gold | |