| #4501 | GREAT + SWERC = PORTOSWERC 2014 | |
| #4502 | Flowery TrailsSWERC 2014 | |
| #4503 | Golf BotSWERC 2014 | |
| #4504 | Book ClubSWERC 2014 | |
| #4505 | Ricochet RobotsSWERC 2014 | |
| #4506 | City ParkSWERC 2014 | |
| #4507 | Playing with GeometrySWERC 2014 | |
| #4508 | Money TransfersSWERC 2014 | |
| #4509 | The Safe SecretSWERC 2014 | |
| #4510 | The Big PaintingSWERC 2014 | |
| #4511 | Wonderland ChaseCode Jam 2022 World Finals | |
| #4512 | Goose, Goose, Ducks?Code Jam 2022 World Finals | |
| #4513 | Slide ParadeCode Jam 2022 World Finals | |
| #4514 | Schrödinger and PavlovCode Jam 2022 World Finals | |
| #4515 | TrianglesCode Jam 2022 World Finals | |
| #4516 | Aerial Archeology / Gregor's VacationsCTU Open Contest 2016Moscow International Workshops 2016 Day 5 | |
| #4517 | Hot Air Ballooning / JumpsCTU Open Contest 2016Moscow International Workshops 2016 Day 5 | |
| #4518 | Cable Connection / Industrial BuildingsCTU Open Contest 2016Moscow International Workshops 2016 Day 5 | |
| #4519 | Rotating Display / Barbara's RobotCTU Open Contest 2016Moscow International Workshops 2016 Day 5 | |
| #4520 | Fence / Fox and GooseCTU Open Contest 2016Moscow International Workshops 2016 Day 5 | |
| #4521 | Tree Stands / ElvesCTU Open Contest 2016Moscow International Workshops 2016 Day 5 | |
| #4522 | Orchard Division / Divide and SellCTU Open Contest 2016Moscow International Workshops 2016 Day 5 | |
| #4523 | It's Raining, Man / Ancient CardsCTU Open Contest 2016Moscow International Workshops 2016 Day 5 | |
| #4524 | Suspicious Samples / HydrologyCTU Open Contest 2016Moscow International Workshops 2016 Day 5 | |
| #4525 | Colorful Tribune / Colors on a StadiumCTU Open Contest 2016Moscow International Workshops 2016 Day 5 | |
| #4526 | 遥远的星系清华集训 2015 Day 1CTT 2015 Day 1 | |
| #4527 | 恐怖的奴隶主清华集训 2015 Day 1CTT 2015 Day 1 | |
| #4528 | 小Q与找茬清华集训 2015 Day 1CTT 2015 Day 1Interactive | |
| #4529 | 静态仙人掌清华集训 2015 Day 2CTT 2015 Day 2 | |
| #4530 | 多边形下海清华集训 2015 Day 2CTT 2015 Day 2 | |
| #4531 | 斗地主清华集训 2015 Day 2CTT 2015 Day 2Output Only | |
| #4532 | 园子里清华集训 2015 Day 3CTT 2015 Day 3 | |
| #4533 | 灯泡测试清华集训 2015 Day 3CTT 2015 Day 3 | |
| #4534 | 新式计算机清华集训 2015 Day 3CTT 2015 Day 3Output Only | |
| #4535 | V清华集训 2015 Day 4CTT 2015 Day 4 | |
| #4536 | Flea清华集训 2015 Day 4CTT 2015 Day 4Interactive | |
| #4537 | King清华集训 2015 Day 4CTT 2015 Day 4Interactive | |
| #4538 | Bowling2022 Multi-University Training Contest 7 | |
| #4539 | Independent Feedback Vertex Set2022 Multi-University Training Contest 7 | |
| #4540 | Counting Stickmen2022 Multi-University Training Contest 7 | |
| #4541 | Black Magic2022 Multi-University Training Contest 7 | |
| #4542 | Cyber Painter2022 Multi-University Training Contest 7 | |
| #4543 | Sumire2022 Multi-University Training Contest 7 | |
| #4544 | Weighted Beautiful Tree2022 Multi-University Training Contest 7 | |
| #4545 | Triangle Game2022 Multi-University Training Contest 7 | |
| #4546 | Counting Good Arrays2022 Multi-University Training Contest 7 | |
| #4547 | Connectivity of Erdős–Rényi Graph2022 Multi-University Training Contest 7 | |
| #4548 | Rock Tree2022 Multi-University Training Contest 7 | |
| #4549 | Alice 和 Bob 又在玩游戏清华集训 2016 Day 1CTT 2016 Day 1 | |
| #4550 | 魔法小程序清华集训 2016 Day 1CTT 2016 Day 1 | |
| #4551 | 数据交互清华集训 2016 Day 1CTT 2016 Day 1 | |
| #4552 | 如何优雅地求和清华集训 2016 Day 2CTT 2016 Day 2 | |
| #4553 | 工厂清华集训 2016 Day 2CTT 2016 Day 2Output Only | |
| #4554 | 联通子树清华集训 2016 Day 2CTT 2016 Day 2 | |
| #4555 | 石家庄的工人阶级队伍比较坚强清华集训 2016 Day 3CTT 2016 Day 3 | |
| #4556 | 你的生命已如风中残烛清华集训 2016 Day 3CTT 2016 Day 3 | |
| #4557 | 温暖会指引我们前行清华集训 2016 Day 3CTT 2016 Day 3 | |
| #4558 | 组合数问题清华集训 2016 Day 4CTT 2016 Day 4 | |
| #4559 | 汽水清华集训 2016 Day 4CTT 2016 Day 4 | |
| #4560 | 定向越野清华集训 2016 Day 4CTT 2016 Day 4 | |
| #4561 | Catfish FarmIOI 2022 Day 1 | |
| #4562 | Prisoner ChallengeIOI 2022 Day 1 | |
| #4563 | Radio TowersIOI 2022 Day 1 | |
| #4564 | Digital CircuitIOI 2022 Day 2 | |
| #4565 | Rarest InsectsIOI 2022 Day 2Interactive | |
| #4566 | Thousands IslandsIOI 2022 Day 2 | |
| #4567 | Admissible MapNorthern Eurasia Finals 2021NERC 2021 | |
| #4568 | Budget DistributionNorthern Eurasia Finals 2021NERC 2021 | |
| #4569 | Connect the PointsNorthern Eurasia Finals 2021NERC 2021 | |
| #4570 | Deletive EditingNorthern Eurasia Finals 2021NERC 2021 | |
| #4571 | Even SplitNorthern Eurasia Finals 2021NERC 2021 | |
| #4572 | Fancy StackNorthern Eurasia Finals 2021NERC 2021 | |
| #4573 | Global WarmingNorthern Eurasia Finals 2021NERC 2021 | |
| #4574 | Heroes of MightNorthern Eurasia Finals 2021NERC 2021 | |
| #4575 | Interactive Treasure HuntNorthern Eurasia Finals 2021NERC 2021Interactive | |
| #4576 | Job LookupNorthern Eurasia Finals 2021NERC 2021 | |
| #4577 | Kingdom PartitionNorthern Eurasia Finals 2021NERC 2021 | |
| #4578 | LabyrinthNorthern Eurasia Finals 2021NERC 2021 | |
| #4579 | XOR PairsJakarta Regional 2021 | |
| #4580 | Bicycle TourJakarta Regional 2021 | |
| #4581 | Energy GenerationJakarta Regional 2021 | |
| #4582 | Uniform MakerJakarta Regional 2021 | |
| #4583 | Concerto de PandemicJakarta Regional 2021 | |
| #4584 | Not OneJakarta Regional 2021 | |
| #4585 | Greedy KnapsackJakarta Regional 2021 | |
| #4586 | Cell GameJakarta Regional 2021 | |
| #4587 | Stable Planetary SystemJakarta Regional 2021 | |
| #4588 | Feeder RobotJakarta Regional 2021 | |
| #4589 | White-Black TreeJakarta Regional 2021 | |
| #4590 | Happy TravellingJakarta Regional 2021 | |
| #4591 | Maxdifficent GroupJakarta Regional 2021 | |
| #4592 | Theramore2022 Multi-University Training Contest 8 | |
| #4593 | Darkmoon Faire2022 Multi-University Training Contest 8 | |
| #4594 | Undercity2022 Multi-University Training Contest 8 | |
| #4595 | Quel'Thalas2022 Multi-University Training Contest 8 | |
| #4596 | Ironforge2022 Multi-University Training Contest 8 | |
| #4597 | Thunder Bluf2022 Multi-University Training Contest 8 | |
| #4598 | Darnassus2022 Multi-University Training Contest 8 | |
| #4599 | Orgrimmar2022 Multi-University Training Contest 8 | |
| #4600 | Gilneas2022 Multi-University Training Contest 8 | |