| #11901 | MinesPetrozavodsk Winter 2018 Day 9 | |
| #11902 | BallsPetrozavodsk Winter 2018 Day 9 | |
| #11903 | Flip a coinPetrozavodsk Winter 2018 Day 9 | |
| #11904 | OctagonsPetrozavodsk Winter 2018 Day 9 | |
| #11905 | Tree PathsPetrozavodsk Winter 2018 Day 9 | |
| #11906 | Very New YorkPetrozavodsk Winter 2018 Day 9 | |
| #11907 | SheepPetrozavodsk Winter 2018 Day 9 | |
| #11908 | Bin PackingPetrozavodsk Winter 2018 Day 9 | |
| #11909 | StatisticsPetrozavodsk Winter 2018 Day 9 | |
| #11910 | ZigzagPetrozavodsk Winter 2018 Day 9 | |
| #11911 | KnapsackPetrozavodsk Winter 2018 Day 9 | |
| #11912 | Battle in Two Pairs of HeroesQingdao Regional 2017 | |
| #11913 | Chenchen, Tangtang and ZengZengQingdao Regional 2017 | |
| #11914 | Collecting CentsQingdao Regional 2017 | |
| #11915 | Enclosure of Land and WaterQingdao Regional 2017 | |
| #11916 | Floppy CubeQingdao Regional 2017 | |
| #11917 | Hex GameQingdao Regional 2017 | |
| #11918 | Pythagoras, One More TimeQingdao Regional 2017 | |
| #11919 | SpacecraftQingdao Regional 2017 | |
| #11920 | The Squared Mosquito CoilQingdao Regional 2017 | |
| #11921 | SuffixQingdao Regional 2017 | |
| #11922 | Our Journey of Xian EndsQingdao Regional 2017 | |
| #11923 | BBP FormulaShenyang Regional 2017 | |
| #11924 | BridgeShenyang Regional 2017 | |
| #11925 | Empty Convex PolygonsShenyang Regional 2017 | |
| #11926 | Defense of the AncientsShenyang Regional 2017 | |
| #11927 | Five-round Show HandShenyang Regional 2017 | |
| #11928 | Heron and His TriangleShenyang Regional 2017 | |
| #11929 | Infinite Fraction PathShenyang Regional 2017 | |
| #11930 | Legends of the Three KingdomsShenyang Regional 2017 | |
| #11931 | Little BoxesShenyang Regional 2017 | |
| #11932 | New Self-describing SequenceShenyang Regional 2017 | |
| #11933 | RabbitsShenyang Regional 2017 | |
| #11934 | TreeShenyang Regional 2017 | |
| #11935 | Wandering RobotsShenyang Regional 2017 | |