| 题目ID | 标题 | 来源 | 正确数 | 通过率 |
|---|---|---|---|---|
| 1017-HDU | A Mathematical Curiosity | East Central North America 1999, Practice | 340 | 72.3% |
| 1370-HDU | Biorhythms | East Central North America 1999; Pacific Northwest 1999 | 214 | 77.5% |
| 1526-HDU | A Plug for UNIX | East Central North America 1999 | 179 | 72.8% |