| #11701 | StairwaysPetrozavodsk Winter 2018 Day 4 | |
| #11702 | Hiding a TreePetrozavodsk Winter 2018 Day 4 | |
| #11703 | DonutPetrozavodsk Winter 2018 Day 5 | |
| #11704 | Circular ArrangementPetrozavodsk Winter 2018 Day 5 | |
| #11705 | EarthquakePetrozavodsk Winter 2018 Day 5 | |
| #11706 | Dynamic Input ToolPetrozavodsk Winter 2018 Day 5 | |
| #11707 | Central LakePetrozavodsk Winter 2018 Day 5 | |
| #11708 | Computing MDSSTPetrozavodsk Winter 2018 Day 5 | |
| #11709 | MST with metropolisPetrozavodsk Winter 2018 Day 5 | |
| #11710 | Number of cyclesPetrozavodsk Winter 2018 Day 5 | |
| #11711 | Square sum of the occurrence countsPetrozavodsk Winter 2018 Day 5 | |
| #11712 | Game of SortingPetrozavodsk Winter 2018 Day 5 | |
| #11713 | Subsequence QueriesPetrozavodsk Winter 2018 Day 5 | |
| #11714 | XOR transformation Petrozavodsk Winter 2018 Day 5 | |
| #11715 | AftermathPetrozavodsk Winter 2018 Day 6 | |
| #11716 | BelieverPetrozavodsk Winter 2018 Day 6 | |
| #11717 | Chalk OutlinePetrozavodsk Winter 2018 Day 6 | |
| #11718 | Do I Wanna Know?Petrozavodsk Winter 2018 Day 6 | |
| #11719 | Exit SongPetrozavodsk Winter 2018 Day 6 | |
| #11720 | Forever and AlwaysPetrozavodsk Winter 2018 Day 6 | |
| #11721 | Gate 21Petrozavodsk Winter 2018 Day 6 | |
| #11722 | HamiltonPetrozavodsk Winter 2018 Day 6 | |
| #11723 | I've Got FriendsPetrozavodsk Winter 2018 Day 6 | |
| #11724 | JokePetrozavodsk Winter 2018 Day 6 | |
| #11725 | Kids Aren't AlrightPetrozavodsk Winter 2018 Day 6 | |
| #11726 | SwapPetrozavodsk Winter 2018 Day 7 | |
| #11727 | Conic SectionPetrozavodsk Winter 2018 Day 7 | |
| #11728 | Connected SubgraphPetrozavodsk Winter 2018 Day 7 | |
| #11729 | HanoiPetrozavodsk Winter 2018 Day 7 | |
| #11730 | Binary StringPetrozavodsk Winter 2018 Day 7 | |
| #11731 | Pattern MatchingPetrozavodsk Winter 2018 Day 7 | |
| #11732 | Interval TreePetrozavodsk Winter 2018 Day 7 | |
| #11733 | Longest Increasing SubsequencePetrozavodsk Winter 2018 Day 7 | |
| #11734 | MedianPetrozavodsk Winter 2018 Day 7 | |
| #11735 | DogsPetrozavodsk Winter 2018 Day 7 | |
| #11736 | Three ArraysPetrozavodsk Winter 2018 Day 8 | |
| #11737 | Expected ShoppingPetrozavodsk Winter 2018 Day 8 | |
| #11738 | Cover the PathsPetrozavodsk Winter 2018 Day 8 | |
| #11739 | ElevatorPetrozavodsk Winter 2018 Day 8 | |
| #11740 | Code-Cola PlantsPetrozavodsk Winter 2018 Day 8 | |
| #11741 | GCDPetrozavodsk Winter 2018 Day 8 | |
| #11742 | Berland PostPetrozavodsk Winter 2018 Day 8 | |
| #11743 | Compressed Spanning SubtreesPetrozavodsk Winter 2018 Day 8Interactive | |
| #11744 | Prefix-free quieriesPetrozavodsk Winter 2018 Day 8 | |
| #11745 | Subsequence Sum QueriesPetrozavodsk Winter 2018 Day 8 | |
| #11746 | Consistent OccurrencesPetrozavodsk Winter 2018 Day 8 | |
| #11747 | Increasing CostsPetrozavodsk Winter 2018 Day 8 | |
| #11748 | Another FizzBuzz TaskPetrozavodsk Summer 2018 Day 9 | |
| #11749 | BingoPetrozavodsk Summer 2018 Day 9 | |
| #11750 | Communication Between RobotsPetrozavodsk Summer 2018 Day 9 | |
| #11751 | DoublindromesPetrozavodsk Summer 2018 Day 9 | |
| #11752 | Exact ArithmeticPetrozavodsk Summer 2018 Day 9 | |
| #11753 | Form the Maximal SetPetrozavodsk Summer 2018 Day 9 | |
| #11754 | Game With TrianglesPetrozavodsk Summer 2018 Day 9 | |
| #11755 | Hokusai ArtworksPetrozavodsk Summer 2018 Day 9 | |
| #11756 | Internet Contents Providing CompanyPetrozavodsk Summer 2018 Day 9 | |
| #11757 | Japanese FoodPetrozavodsk Summer 2018 Day 9 | |
| #11758 | KnightsPetrozavodsk Summer 2018 Day 9 | |
| #11759 | Labeled PointsPetrozavodsk Summer 2018 Day 9 | |
| #11760 | Thomas | |
| #11761 | Stone Jump | |
| #11762 | Maxwell's Tiles | |
| #11763 | Distributive Property | |
| #11764 | 1D Super Checkers Solitaire | |
| #11765 | Walkable Strings | |
| #11766 | K-Regular Array | |
| #11767 | Cubist Painting | |
| #11768 | Unfair Game | |
| #11769 | Another Expected Value Problem | |
| #11770 | Pointers | |
| #11771 | Permutation Recovery | |
| #11772 | Subsequence MEX | |
| #11773 | Ramen Packs | |
| #11774 | Fermat's Optimization ProblemHong Kong Regional 2017 | |
| #11775 | Black and WhiteHong Kong Regional 2017 | |
| #11776 | Equivalence of SudokuHong Kong Regional 2017 | |
| #11777 | Card collectionHong Kong Regional 2017 | |
| #11778 | Base Station SitesHong Kong Regional 2017 | |
| #11779 | Nearby BicyclesHong Kong Regional 2017 | |
| #11780 | Optimal Coin ChangeHong Kong Regional 2017 | |
| #11781 | SetsHong Kong Regional 2017 | |
| #11782 | Count the Even IntegersHong Kong Regional 2017 | |
| #11783 | TriangleHong Kong Regional 2017 | |
| #11784 | MarineHong Kong Regional 2017 | |
| #11785 | Archery TournamentNERC 2017NEERC 2017 | |
| #11786 | BoxNERC 2017NEERC 2017 | |
| #11787 | ConnectionsNERC 2017NEERC 2017 | |
| #11788 | Designing the ToyNERC 2017NEERC 2017 | |
| #11789 | Easy QuestNERC 2017NEERC 2017 | |
| #11790 | The Final LevelNERC 2017NEERC 2017 | |
| #11791 | The Great WallNERC 2017NEERC 2017 | |
| #11792 | HackNERC 2017NEERC 2017Interactive | |
| #11793 | Interactive SortNERC 2017NEERC 2017Interactive | |
| #11794 | Journey from Petersburg to MoscowNERC 2017NEERC 2017 | |
| #11795 | Knapsack CryptosystemNERC 2017NEERC 2017 | |
| #11796 | Laminar FamilyNERC 2017NEERC 2017 | |
| #11797 | AIPetrozavodsk Summer 2019 Day 7 | |
| #11798 | Bitwise AutomatonPetrozavodsk Summer 2019 Day 7 | |
| #11799 | ChallengePetrozavodsk Summer 2019 Day 7 | |
| #11800 | Game of HexPetrozavodsk Summer 2019 Day 7 | |