| #22801 | Cow DominoesUSACO 2001 Fall Open Green | |
| #22802 | Cow PlumbingUSACO 2001 Fall Open Green | |
| #22803 | Dinner TimeUSACO 2001 Fall Open Green | |
| #22804 | CoweseUSACO 2001 Fall Open Green | |
| #22805 | Dictionary NumbersUSACO 2001 Fall Open Orange | |
| #22806 | Hungry CowsUSACO 2001 Fall Open Orange | |
| #22807 | Cow RelaysUSACO 2001 US Open Green | |
| #22808 | EarthquakeUSACO 2001 US Open Green | |
| #22809 | Fiber CommunicationsUSACO 2002 February Green | |
| #22810 | Rebuilding RoadsUSACO 2002 February Green | |
| #22811 | Triangular PasturesUSACO 2002 February Green | |
| #22812 | BUY LOW, BUY LOWERUSACO 2002 February Orange | |
| #22813 | Cow ShuffleUSACO 2001 Fall Open Orange | |
| #22814 | Cow CyclingUSACO 2002 February Green | |
| #22815 | Power Hungry CowsUSACO 2002 February Green | |
| #22816 | Negative Number BasesUSACO 2000 Fall Open Orange | |
| #22817 | Crossword Puzzle WordsUSACO 2000 Fall Open Orange | |
| #22818 | Cows on ParadeUSACO 2000 Fall Open Orange | |
| #22819 | KrunchUSACO 2001 Spring Open Orange | |
| #22820 | Square DesignsUSACO 2001 Spring Open Orange | |
| #22821 | Runaround NumbersUSACO 2001 Spring Open Orange | |
| #22822 | Score InflationUSACO 2001 Spring Open Orange | |
| #22823 | Ice CreamUSACO 2001 Spring Open Orange | |
| #22824 | CowfixUSACO 2001 Spring Open Green | |
| #22825 | Cattle SpottingUSACO 2001 Spring Open Green | |
| #22826 | The Milk RouteUSACO 2001 Spring Open Green | |
| #22827 | Traveling CowsUSACO 2001 Spring Open Green | |
| #22828 | AquaHo Chi Minh City Regional 2022 | |
| #22829 | Binary AssignmentHo Chi Minh City Regional 2022 | |
| #22830 | Changing SeatsHo Chi Minh City Regional 2022 | |
| #22831 | Date, date & date!Ho Chi Minh City Regional 2022 | |
| #22832 | Emotional DamageHo Chi Minh City Regional 2022 | |
| #22833 | Fabulous ActivityHo Chi Minh City Regional 2022 | |
| #22834 | Goal-line TechnologyHo Chi Minh City Regional 2022 | |
| #22835 | Hardest ProblemHo Chi Minh City Regional 2022 | |
| #22836 | InversionHo Chi Minh City Regional 2022 | |
| #22837 | Joining LettersHo Chi Minh City Regional 2022 | |
| #22838 | K PathsHo Chi Minh City Regional 2022 | |
| #22839 | Lexicographically MinimumHo Chi Minh City Regional 2022 | |
| #22840 | Median of Xor Sequence — Easy VersionHo Chi Minh City Regional 2022 | |
| #22841 | Maximum Diameter | |
| #22842 | XOR Cycle | |
| #22843 | Neighbour or Opposite | |
| #22844 | CPK! Remix | |
| #22845 | JAG City Marathon I | |
| #22846 | Professor JAG's Language | |
| #22847 | Find Iotas | |
| #22848 | Longest Symmetry | |
| #22849 | Capybara Petting Club | |
| #22850 | Sliding Puzzle on Tree | |
| #22851 | Group Strength | |
| #22852 | Rabbit, Rabbit, Rabbit | |
| #22853 | Brace for Impact! | |
| #22854 | Deque Bracket Optimization | |
| #22855 | Two Greedy Customers | |
| #22856 | Robot Damage | |
| #22857 | Vibe Coding | |
| #22858 | Tree + 1 | |
| #22859 | Longest Path on DAGInteractive | |
| #22860 | Warp | |
| #22861 | Buttons | |
| #22862 | Take Many ABA | |
| #22863 | Empty Intersection | |
| #22864 | Edge Exchanges | |
| #22865 | Ants Sort | |
| #22866 | ABbreviation | |
| #22867 | Line Up! | |
| #22868 | Self-Destruct Sequence | |
| #22869 | Box Tower II | |
| #22870 | vs Hydra | |
| #22871 | Guess PalindromeInteractive | |
| #22872 | Noise Cancelling | |
| #22873 | JAG City Marathon II | |
| #22874 | Forbidden Word | |
| #22875 | Two Friend Groups | |
| #22876 | Treasure Hunting | |
| #22877 | Best Contest DirectorThe 4th Universal Cup Semifinals | |
| #22878 | Call You With Your Name 4The 4th Universal Cup Semifinals | |
| #22879 | Strange Sorting 3The 4th Universal Cup Semifinals | |
| #22880 | Guess the GraphThe 4th Universal Cup SemifinalsInteractive | |
| #22881 | Subset SumsThe 4th Universal Cup Semifinals | |
| #22882 | ModeThe 4th Universal Cup Semifinals | |
| #22883 | TeleportThe 4th Universal Cup Semifinals | |
| #22884 | Idols and FansThe 4th Universal Cup Semifinals | |
| #22885 | Graph GameThe 4th Universal Cup SemifinalsInteractive | |
| #22886 | Merge SequenceThe 4th Universal Cup Semifinals | |
| #22887 | Iridescent Universe 3The 4th Universal Cup Semifinals | |
| #22888 | White Night 3The 4th Universal Cup Semifinals | |
| #22889 | Queue Editor 2The 4th Universal Cup Semifinals | |
| #22890 | CantoneseThe 4th Universal Cup Semifinals Warm up | |
| #22891 | Counting Sequence 2The 4th Universal Cup Semifinals Warm up | |
| #22892 | Random NumbersThe 4th Universal Cup Semifinals Warm up | |
| #22893 | Puzzle: PentominousThe 4th Universal Cup Semifinals Warm up | |
| #22894 | Light UpThe 4th Universal Cup Semifinals Warm up | |
| #22895 | Coprime MatrixOutput OnlyThe 4th Universal Cup Semifinals Warm up | |
| #22896 | DS Team Selection 3The 4th Universal Cup Semifinals Warm up | |
| #22897 | The easiest “Guess the Number” Task in the Universal CupInteractiveThe 4th Universal Cup Semifinals Warm up | |
| #22898 | Football TournamentMexican OI 2025 Day 1 | |
| #22899 | WizardsMexican OI 2025 Day 1 | |
| #22900 | MatrixMexican OI 2025 Day 1 | |