| ID | Problem Show tags Hide tags | AC / Tried | Difficulty | |
|---|---|---|---|---|
| 820 | 820 特殊的四位数 | 0 / 0 | (None) | |
| 821 | 821 区间求数 | 0 / 0 | (None) | |
| 822 | 822 求一个数 | 0 / 0 | (None) | |
| 826 | 826 有趣的自然数 | 0 / 0 | (None) | |
| 839 | 839 求一个5位数 | 0 / 0 | (None) | |
| 840 | 840 数学问题:计算1 | 0 / 0 | (None) |
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