| #401 | 因子统计 (Ex) | |
| #402 | MatryoshkaJOISC 2016 Day 1 | |
| #403 | Memory2JOISC 2016 Day 1Interactive | |
| #404 | SolitaireJOISC 2016 Day 1 | |
| #405 | EmploymentJOISC 2016 Day 2 | |
| #406 | SandwichJOISC 2016 Day 2 | |
| #407 | ToiletsJOISC 2016 Day 2 | |
| #408 | Dungeon 2JOISC 2016 Day 3Interactive | |
| #409 | SushiJOISC 2016 Day 3 | |
| #410 | TelegraphJOISC 2016 Day 3 | |
| #411 | Dangerous SkatingJOISC 2016 Day 4 | |
| #412 | Snowy RoadsJOISC 2016 Day 4Communication | |
| #413 | Worst Reporter 2JOISC 2016 Day 4 | |
| #414 | 一般难度的推式子题 | |
| #415 | 王的象棋世界 | |
| #416 | Additive ClassPetrozavodsk Summer 2014 Day 1 | |
| #417 | Board BlitzPetrozavodsk Summer 2014 Day 1 | |
| #418 | Divisor CountPetrozavodsk Summer 2014 Day 1 | |
| #419 | Domino TilingPetrozavodsk Summer 2014 Day 1 | |
| #420 | HourglassPetrozavodsk Summer 2014 Day 1 | |
| #421 | k-th MeanderPetrozavodsk Summer 2014 Day 1 | |
| #422 | Records and CyclesPetrozavodsk Summer 2014 Day 1 | |
| #423 | Rock-Paper-Scissors on a PlanePetrozavodsk Summer 2014 Day 1 | |
| #424 | Set OperationsPetrozavodsk Summer 2014 Day 1 | |
| #425 | 字符串ZJOI 2020 Day 1 | |
| #426 | 传统艺能ZJOI 2020 Day 1 | |
| #427 | 序列ZJOI 2020 Day 1 | |
| #429 | Nordic CampingNordic Olympiad in Informatics 2018 | |
| #430 | French FriesNordic Olympiad in Informatics 2018 | |
| #431 | Mysterious ArrayNordic Olympiad in Informatics 2018 | |
| #432 | 染色游戏ZJOI 2020 Day 2 | |
| #433 | 抽卡ZJOI 2020 Day 2 | |
| #434 | 密码ZJOI 2020 Day 2 | |
| #435 | Painting WallsAPIO 2020 | |
| #436 | Swapping CitiesAPIO 2020 | |
| #437 | Fun TourAPIO 2020Interactive | |
| #438 | 美食家NOI 2020 Day 1 (China) | |
| #439 | 命运NOI 2020 Day 1 (China) | |
| #440 | 时代的眼泪NOI 2020 Day 1 (China) | |
| #441 | 制作菜品NOI 2020 Day 2 (China) | |
| #442 | 超现实树NOI 2020 Day 2 (China) | |
| #443 | 翻修道路NOI 2020 Day 2 (China) | |
| #444 | 算术表达式省选 | |
| #445 | A Place For My HeadPetrozavodsk Summer 2017 Day 5 | |
| #446 | New DividePetrozavodsk Summer 2017 Day 5 | |
| #447 | Lying From YouPetrozavodsk Summer 2017 Day 5 | |
| #448 | Don't StayPetrozavodsk Summer 2017 Day 5 | |
| #449 | In The EndPetrozavodsk Summer 2017 Day 5 | |
| #450 | From The InsidePetrozavodsk Summer 2017 Day 5 | |
| #451 | NumbPetrozavodsk Summer 2017 Day 5 | |
| #452 | One Step CloserPetrozavodsk Summer 2017 Day 5 | |
| #453 | InvisiblePetrozavodsk Summer 2017 Day 5Interactive | |
| #454 | Leave Out All The RestPetrozavodsk Summer 2017 Day 5 | |
| #455 | FaintPetrozavodsk Summer 2017 Day 5 | |
| #460 | Colored Graph | |
| #464 | 前缀函数 / KMPKMP模板题 | |
| #495 | 特征多项式模板题 | |
| #499 | 树 Hash模板题 | |