| ID | 题目 显示标签 隐藏标签 | AC / 尝试 | 难度 | |
|---|---|---|---|---|
| 514 | P1504 Adding Reversed Numbers | 0 / 0 | (无) | |
| 515 | P1505 Copying Books | 0 / 0 | (无) | |
| 516 | P1506 Substitution Cipher | 0 / 0 | (无) | |
| 517 | P1507 Commedia dell' arte | 0 / 0 | (无) | |
| 518 | P1508 Skyscraper Floors | 0 / 0 | (无) | |
| 519 | P1509 Glass Beads | 0 / 0 | (无) | |
| 520 | P1510 Hares and Foxes | 0 / 0 | (无) | |
| 521 | P1511 Invitation Cards | 0 / 0 | (无) |