| #6501 | Graph PartitioningCCPC Final 2022 | |
| #6502 | Disjoint Set UnionCCPC Final 2022 | |
| #6503 | DFS Order 3CCPC Final 2022 | |
| #6504 | Flower's Land 2CCPC Final 2022 | |
| #6505 | CCPC StringCCPC Final 2022 | |
| #6506 | Chase Game 3CCPC Final 2022 | |
| #6507 | Recover the StringCCPC Final 2022 | |
| #6508 | This is not an Abnormal Team!CCPC Final 2022 | |
| #6509 | Not Another Range Query ProblemCCPC Final 2022 | |
| #6510 | Best Carry Player 3CCPC Final 2022 | |
| #6511 | Balancing SequencesCCPC Final 2022 | |
| #6512 | Completely Multiplicative FunctionCCPC Final 2022 | |
| #6513 | Expression 3CCPC Final 2022 | |
| #6514 | Is it well known in Poland?Universal Cup | |
| #6515 | Path PlanningUniversal CupGuangdong Provincial 2023 | |
| #6516 | New but Nostalgic ProblemUniversal CupGuangdong Provincial 2023 | |
| #6517 | Computational GeometryUniversal CupGuangdong Provincial 2023 | |
| #6518 | Not Another Linear Algebra ProblemUniversal Cup | |
| #6519 | X Equals YUniversal CupGuangdong Provincial 2023 | |
| #6520 | Classic ProblemUniversal CupGuangdong Provincial 2023 | |
| #6521 | Swapping OperationUniversal CupGuangdong Provincial 2023 | |
| #6522 | Digit ModeShaanxi Provincial 2019 | |
| #6523 | Escape PlanShaanxi Provincial 2019 | |
| #6524 | Final Defense LineUniversal CupZhejiang Provincial 2017 | |
| #6525 | New HousesUniversal CupGuangdong Provincial 2023 | |
| #6526 | CanvasUniversal CupGuangdong Provincial 2023 | |
| #6527 | CyberlandAPIO 2023 | |
| #6528 | SequenceAPIO 2023 | |
| #6529 | Alice, Bob and CircuitAPIO 2023Communication | |
| #6530 | Programming ContestGuangdong Provincial 2023 | |
| #6531 | Base Station ConstructionGuangdong Provincial 2023 | |
| #6532 | TradingGuangdong Provincial 2023 | |
| #6533 | Traveling in CellsGuangdong Provincial 2023 | |
| #6534 | Peg SolitaireGuangdong Provincial 2023 | |
| #6535 | ReversingPetrozavodsk Winter 2023 Day 2 | |
| #6536 | LawyersPetrozavodsk Winter 2023 Day 2 | |
| #6537 | One, Two, ThreePetrozavodsk Winter 2023 Day 2 | |
| #6538 | Lonely KingPetrozavodsk Winter 2023 Day 2 | |
| #6539 | Treasure BoxPetrozavodsk Winter 2023 Day 2 | |
| #6540 | Beautiful SequencePetrozavodsk Winter 2023 Day 2 | |
| #6541 | Make Everything WhitePetrozavodsk Winter 2023 Day 2 | |
| #6542 | Optimal Quadratic FunctionPetrozavodsk Winter 2023 Day 2 | |
| #6543 | Visiting FriendPetrozavodsk Winter 2023 Day 2 | |
| #6544 | Cooperation GamePetrozavodsk Winter 2023 Day 2 | |
| #6545 | Connect the DotsPetrozavodsk Winter 2023 Day 2 | |
| #6546 | Greedy Bipartite MatchingPetrozavodsk Winter 2023 Day 5 | |
| #6547 | BansheePetrozavodsk Winter 2023 Day 5 | |
| #6548 | CoursesPetrozavodsk Winter 2023 Day 5 | |
| #6549 | Two Missing NumbersPetrozavodsk Winter 2023 Day 5Communication | |
| #6550 | Elimination RacePetrozavodsk Winter 2023 Day 5 | |
| #6551 | Forever YoungPetrozavodsk Winter 2023 Day 5 | |
| #6552 | Good and Lucky MatricesPetrozavodsk Winter 2023 Day 5Communication | |
| #6553 | Shared Memory SwitchPetrozavodsk Winter 2023 Day 5 | |
| #6554 | Endless RoadPetrozavodsk Winter 2023 Day 5 | |
| #6555 | Sets May Be GoodPetrozavodsk Winter 2023 Day 5 | |
| #6556 | Text EditorPetrozavodsk Winter 2023 Day 5Communication | |
| #6557 | LCSLCSLCSPetrozavodsk Winter 2023 Day 5 | |
| #6558 | Allergen TestingNAC 2023 | |
| #6559 | A Tree and Two EdgesNAC 2023 | |
| #6560 | Broken Minimum Spanning TreeNAC 2023 | |
| #6561 | Fail FastNAC 2023 | |
| #6562 | First LastNAC 2023 | |
| #6563 | Four SquareNAC 2023 | |
| #6564 | Frequent FlierNAC 2023 | |
| #6565 | Game Show EliminationNAC 2023 | |
| #6566 | Power of DivisorsNAC 2023 | |
| #6567 | Repetitive String InventionNAC 2023 | |
| #6568 | Space AlignmentNAC 2023 | |
| #6569 | Splitting PairsNAC 2023 | |
| #6570 | Who Watches the Watchmen?NAC 2023 | |
| #6599 | The Grand TournamentShenyang Regional 2020 | |
| #6600 | Whispers of the Old GodsShenyang Regional 2020 | |