| Segment Sum | 2300 | Solve |
| Selling Souvenirs | 2300 | Solve |
| Sereja and Squares | 2300 | Solve |
| Sereja and Two Sequences | 2300 | Solve |
| Set of Points | 2300 | Solve |
| Shaass the Great | 2300 | Solve |
| Sheet Music | 2300 | Solve |
| Shortest Path Problem? | 2300 | Solve |
| Side Transmutations | 2300 | Solve |
| Similar Sets | 2300 | Solve |
| Similar Words | 2300 | Solve |
| Ski Base | 2300 | Solve |
| Sliding Tiles | 2300 | Solve |
| Sliding Tree | 2300 | Solve |
| Sonya and Informatics | 2300 | Solve |
| Sonya and Matrix | 2300 | Solve |
| Sonya and Problem Wihtout a Legend | 2300 | Solve |
| Sorting Pancakes | 2300 | Solve |
| Spring cleaning | 2300 | Solve |
| Square Equation Roots | 2300 | Solve |
| Square Tiling | 2300 | Solve |
| Stars | 2300 | Solve |
| Steps to One | 2300 | Solve |