| ID | Problem Show tags Hide tags | AC / Tried | Difficulty | |
|---|---|---|---|---|
| 315 | P1099 [NOIP2007 提高组] 树网的核 | 2 / 13 | 9 | |
| 421 | P2272 [ZJOI2007] 最大半连通子图 | 8 / 61 | 8 | |
| 267 | P2880 [USACO07JAN] Balanced Lineup G | 16 / 18 | 5 | |
| 385 | P4170 [CQOI2007] 涂色 | 8 / 24 | 7 | 
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