| ID | Problem Show tags Hide tags | AC / Tried | Difficulty | |
|---|---|---|---|---|
| 415 | ecnu20191C 和 | 7 / 14 | 2 | |
| 457 | ecnu20201A 钥匙 | 4 / 20 | 2 | |
| 458 | ecnu20201B 上古计算机 | 5 / 34 | 2 |
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