| Color Revolution | 1000 | Solve |
| Coloring Rectangles | 1000 | Solve |
| Combination Lock | 1000 | Solve |
| Commentary Boxes | 1000 | Solve |
| Competitive Programmer | 1000 | Solve |
| Consecutive Points Segment | 1000 | Solve |
| Contest Start | 1000 | Solve |
| Conveyor Belts | 1000 | Solve |
| Copying Homework | 1000 | Solve |
| Cormen --- The Best Friend Of a Man | 1000 | Solve |
| Count the Number of Pairs | 1000 | Solve |
| Cows and Poker Game | 1000 | Solve |
| Crafting | 1000 | Solve |
| Crossword solving | 1000 | Solve |
| Currency System in Geraldion | 1000 | Solve |
| DZY Loves Strings | 1000 | Solve |
| Dasha and Stairs | 1000 | Solve |
| Deadly Laser | 1000 | Solve |
| Deck of Cards | 1000 | Solve |
| Destruction of the Dandelion Fields | 1000 | Solve |
| Detective Book | 1000 | Solve |
| Dice Tower | 1000 | Solve |
| Different Differences | 1000 | Solve |