| #21301 | Concurrently Balanced StringsUSACO 2012 November Gold | |
| #21302 | Balanced TreesUSACO 2012 November Gold | |
| #21313 | Reserved | |
| #21314 | Reserved | |
| #21315 | Meet and GreetUSACO 2012 December Bronze | |
| #21316 | Scrambled LettersUSACO 2012 December Bronze | |
| #21317 | Crazy FencesUSACO 2012 December Bronze | |
| #21318 | Crazy FencesUSACO 2012 December Silver | |
| #21319 | Wifi SetupUSACO 2012 December Silver | |
| #21320 | Milk RoutingUSACO 2012 December Silver | |
| #21321 | Gangs of Instanbull/CowstantinopleUSACO 2012 December Gold | |
| #21322 | First!USACO 2012 December Gold | |
| #21323 | Running Away From the BarnUSACO 2012 December Gold | |
| #21324 | MirrorsUSACO 2013 January Bronze | |
| #21325 | Painting the Fence (Bronze)USACO 2013 January Bronze | |
| #21326 | Liars and Truth TellersUSACO 2013 January Bronze | |
| #21327 | Painting the FenceUSACO 2013 January Silver | |
| #21328 | Square OverlapUSACO 2013 January Silver | |
| #21329 | Party InvitationsUSACO 2013 January Silver | |
| #21330 | Cow LineupUSACO 2013 January Gold | |
| #21331 | Island TravelsUSACO 2013 January Gold | |
| #21332 | SeatingUSACO 2013 January Gold | |
| #21333 | Message RelayUSACO 2013 February Bronze | |
| #21334 | Cow CrossingsUSACO 2013 February Bronze | |
| #21335 | PerimeterUSACO 2013 February Bronze | |
| #21336 | PerimeterUSACO 2013 February Silver | |
| #21337 | TractorUSACO 2013 February Silver | |
| #21338 | Milk SchedulingUSACO 2013 February Silver | |
| #21339 | Partitioning the FarmUSACO 2013 February Gold | |
| #21340 | TaxiUSACO 2013 February Gold | |
| #21341 | Route DesigningUSACO 2013 February Gold | |
| #21342 | Cow RaceUSACO 2013 March Bronze | |
| #21343 | Breed ProximityUSACO 2013 March Bronze | |
| #21344 | Breed AssignmentUSACO 2013 March Bronze | |
| #21345 | Poker HandsUSACO 2013 March Silver | |
| #21346 | Farm PaintingUSACO 2013 March Silver | |
| #21347 | The Cow RunUSACO 2013 March Silver | |
| #21348 | The Cow RunUSACO 2013 March Gold | |
| #21349 | Hill WalkUSACO 2013 March Gold | |
| #21350 | NecklaceUSACO 2013 March Gold | |
| #21351 | Bovine BalletUSACO 2013 US Open Bronze | |
| #21352 | BlinkUSACO 2013 US Open Bronze | |
| #21353 | PhotoUSACO 2013 US Open Bronze | |
| #21354 | HaywireUSACO 2013 US Open Bronze | |
| #21355 | What's Up With Gravity?USACO 2013 US Open Silver | |
| #21356 | Fuel EconomyUSACO 2013 US Open Silver | |
| #21357 | Luxury River CruiseUSACO 2013 US Open Silver | |
| #21358 | PhotoUSACO 2013 US Open Gold | |
| #21359 | Yin and YangUSACO 2013 US Open Gold | |
| #21360 | Figure EightUSACO 2013 US Open Gold | |
| #21361 | Combination LockUSACO 2013 November Bronze | |
| #21362 | Goldilocks and the N CowsUSACO 2013 November Bronze | |
| #21363 | Farmer John has no Large Brown CowUSACO 2013 November Bronze | |
| #21364 | Farmer John has no Large Brown CowUSACO 2013 November Silver | |
| #21365 | Crowded CowsUSACO 2013 November Silver | |
| #21366 | Pogo-CowUSACO 2013 November Silver | |
| #21367 | Empty StallsUSACO 2013 November Gold | |
| #21368 | Line of SightUSACO 2013 November Gold | |
| #21369 | No ChangeUSACO 2013 November Gold | |
| #21370 | Record KeepingUSACO 2013 December Bronze | |
| #21371 | Cow BaseballUSACO 2013 December Bronze | |
| #21372 | WormholesUSACO 2013 December Bronze | |
| #21373 | Milk SchedulingUSACO 2013 December Silver | |
| #21374 | Vacation PlanningUSACO 2013 December Silver | |
| #21375 | The Bessie ShuffleUSACO 2013 December Silver | |
| #21376 | Vacation Planning (gold)USACO 2013 December Gold | |
| #21377 | Optimal MilkingUSACO 2013 December Gold | |
| #21378 | The Bessie Shuffle (gold)USACO 2013 December Gold | |
| #21379 | Best Trades Again | |
| #21380 | Harmonizing Charges | |
| #21381 | Killer Die | |
| #21382 | Delete and Backspace中国科学技术大学 2026 年新生赛 | |
| #21383 | Vanishing Inversions中国科学技术大学 2026 年新生赛 | |
| #21384 | Range Minimization中国科学技术大学 2026 年新生赛 | |
| #21385 | Corridor Tuning中国科学技术大学 2026 年新生赛 | |
| #21386 | Punctured Neighborhood中国科学技术大学 2026 年新生赛 | |
| #21387 | A Simple Construction Problem中国科学技术大学 2026 年新生赛 | |
| #21388 | Nailoong vs. Bombloong 3.1中国科学技术大学 2026 年新生赛 | |
| #21389 | Nailoong vs. Bombloong 3.2中国科学技术大学 2026 年新生赛 | |
| #21390 | Same Frequency Echo中国科学技术大学 2026 年新生赛 | |
| #21391 | Emordnilap中国科学技术大学 2026 年新生赛 | |
| #21392 | Card Packs中国科学技术大学 2026 年新生赛 | |
| #21393 | AC Automaton中国科学技术大学 2026 年新生赛 | |
| #21394 | Iterated Fixed Points中国科学技术大学 2026 年新生赛 | |