| #67 | Two TransportationsJOISC 2019 Day 2Communication | |
| #111 | Amusement ParkJOI Open Contest 2017Communication | |
| #120 | Airline Route MapJOISC 2018 Day 3Communication | |
| #141 | 8 染色Communication | |
| #147 | FloppyRMI 2020Communication | |
| #295 | 编码干扰SDOI 2014 Round 2 Day 2Communication | |
| #364 | Broken DeviceJOISC 2017 Day 2Communication | |
| #370 | CityJOISC 2017 Day 4Communication | |
| #412 | Snowy RoadsJOISC 2016 Day 4Communication | |
| #503 | IP over Avian CarrierNordic OI 2017Communication | |
| #1139 | StationsIOI 2020 Day 2Communication | |
| #1212 | NavigationJOISC 2015 Day 3Communication | |
| #1407 | Kanji ShiritoriJOISC 2014 Day 4Communication | |
| #1419 | MessengerJOISC 2013 Day 4Communication | |
| #1505 | Last SupperIOI 2012 Day 2Communication | |
| #2006 | ParrotsIOI 2011 Day 2Communication | |
| #2348 | BijectionPetrozavodsk Winter 2020 Day 1Communication | |
| #2351 | Lost in TransferPetrozavodsk Winter 2020 Day 1Communication | |
| #2352 | Maze with a HintPetrozavodsk Winter 2020 Day 1Communication | |
| #2810 | SpeedrunRMI 2021 Day 1Communication | |
| #3097 | ShoppingJOISC 2021 Day 2Communication | |
| #3098 | Ancient MachineJOISC 2021 Day 3Communication | |
| #3102 | Navigation 2JOISC 2021 Day 4Communication | |
| #3505 | FlightsJOISC 2022 Day 2Communication | |
| #3507 | Broken Device 2JOISC 2022 Day 3Communication | |
| #3560 | Stray CatJOISC 2020 Day 3Communication | |
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| #4087 | 철도KOI TST 2021 Day 1Communication | |
| #4208 | Flight to the FordBaltic OI 2022 Day 2Communication | |
| #4250 | MarsAPIO 2022Communication | |
| #4664 | Broken ConnectionByteDance-Moscow Workshops Camp 2022 Shuffle ContestCommunication | |
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| #4824 | Bracket-and-bar SequencesPetrozavodsk Summer 2022 Day 4Communication | |
| #4825 | Even and Odd CombinationsPetrozavodsk Summer 2022 Day 4Communication | |
| #4826 | Find the PartsPetrozavodsk Summer 2022 Day 4Communication | |
| #4827 | Message Made of NoisePetrozavodsk Summer 2022 Day 4Communication | |
| #4828 | Four Plus FourPetrozavodsk Summer 2022 Day 4Communication | |
| #4829 | Mark on a GraphPetrozavodsk Summer 2022 Day 4Communication | |
| #4830 | Transfer of DutyPetrozavodsk Summer 2022 Day 4Communication | |
| #4831 | Eager SortingPetrozavodsk Summer 2022 Day 4Communication | |
| #4832 | TelepathyPetrozavodsk Summer 2022 Day 4Communication | |
| #4833 | Tetra-puzzlePetrozavodsk Summer 2022 Day 4Communication | |
| #4834 | TrijectionPetrozavodsk Summer 2022 Day 4Communication | |
| #4912 | WereYouLast集训队互测 2021 Round 8Communication | |
| #5018 | nth集训队互测 2022 Round 2Communication | |
| #5185 | Chika Wants to CheatEGOI 2022 Day 2Communication | |
| #5366 | 面国超算北大集训 2018 Day 4CTT 2018 Day 4CommunicationUnavailable | |
| #5447 | 鸽子CTS 2023 Day 1Communication | |
| #5533 | TrickCEOI 2016 Day 1Communication | |
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| #6529 | Alice, Bob and CircuitAPIO 2023Communication | |
| #6549 | Two Missing NumbersPetrozavodsk Winter 2023 Day 5Communication | |
| #6552 | Good and Lucky MatricesPetrozavodsk Winter 2023 Day 5Communication | |
| #6556 | Text EditorPetrozavodsk Winter 2023 Day 5Communication | |
| #6661 | 야유회KOI TST 2023 Day 1Communication | |
| #6669 | MapaIzborne Pripreme 2023 Day 2Communication | |
| #6985 | Card TrickeJOI 2020 Day 2Communication | |
| #7115 | Can You Guess My Sequence?Communication | |
| #7161 | Guessing GameEGOI 2023 Day 2Communication | |
| #7280 | The Ties That Guide UsCEOI 2023 Day 2Communication | |
| #7291 | Painting SquaresIOI 2020 PracticeCommunication | |
| #7643 | esreveR OrderUniversal CupCommunication | |
| #7723 | Hash ServerPetrozavodsk Summer 2023 Day 2Communication | |
| #8221 | 多方计算CTS 2024 Day 2Communication | |
| #8320 | 种树THUSC 2021 Day 1Communication | |
| #8373 | MissingCommunication | |
| #8378 | WaldoCommunication | |
| #8629 | 寻宝THUSC 2022 Day 1Communication | |
| #8642 | Spy 3JOISC 2024 Day 1JOIST 2024 Day 1Communication | |
| #8644 | Tricolor LightsJOISC 2024 Day 2JOIST 2024 Day 2Communication | |
| #8726 | Magic ShowAPIO 2024Communication | |
| #8794 | (Un)labeled graphsUniversal CupCommunication | |
| #8870 | Human ResourcesCERC 2023Communication | |
| #8903 | Тайное посланиеROI 2023 Day 1Communication | |
| #8969 | NovineIzborne Pripreme 2021 Day 2Communication | |
| #9138 | Marks SumUniversal CupCommunication | |
| #9185 | Garden DecorationsEGOI 2024 Day 1Communication | |
| #9237 | MessageIOI 2024 Day 1Communication | |
| #9688 | 通信CTS 2025 Day 2Communication | |
| #10097 | VortexCommunicationPetrozavodsk Winter 2025 Day 7 | |
| #10168 | Dota 322 for DroidsPetrozavodsk Winter 2024 Day 7Communication | |
| #10178 | 그리드 복원KOI TST 2025 Day 1Communication | |
| #10198 | AutomatizacijaCroatian OI 2025Communication | |
| #11402 | Fortune Telling 3JOISC 2025 Day 1JOIST 2025 Day 1Communication | |
| #11444 | Flash memoryBaltic OI 2019 Day 1Communication | |
| #12045 | TelepathyJOI Open Contest 2025Communication | |
| #12650 | SaveitIOI 2010 Day 2Communication | |
| #13172 | Laser StrikeEGOI 2025 Day 2Communication | |
| #13549 | TreasureIOI 2024 PracticeCommunication | |
| #13594 | MenszaCroatian OI 2022Communication | |
| #13613 | QuestionCEOI 2014 Day 1Communication | |
| #13651 | Magic TrickIOI 2025 PracticeCommunication | |
| #13794 | Data TransferIOI 2019 PracticeCommunication | |
| #13906 | MigrationsIOI 2025 Day 2Communication | |
| #14056 | TheseusCEOI 2025 Day 2Communication | |