| ID | 题目 显示标签 隐藏标签 | AC / 尝试 | 难度 | |
|---|---|---|---|---|
| 505 | P1504 Adding Reversed Numbers | 0 / 0 | (无) | |
| 506 | P1505 Copying Books | 0 / 0 | (无) | |
| 507 | P1506 Substitution Cipher | 0 / 0 | (无) | |
| 508 | P1507 Commedia dell' arte | 0 / 0 | (无) | |
| 509 | P1508 Skyscraper Floors | 0 / 0 | (无) | |
| 510 | P1509 Glass Beads | 0 / 0 | (无) | |
| 511 | P1510 Hares and Foxes | 0 / 0 | (无) | |
| 512 | P1511 Invitation Cards | 0 / 0 | (无) |