| ID | Problem Show tags Hide tags | AC / Tried | Difficulty | |
|---|---|---|---|---|
| 1874 | P1312 [NOIP2011 提高组] Mayan 游戏 | 0 / 1 | 10 | |
| 2786 | P2786 [NOIP2011 提高组] 铺地毯 | 2 / 13 | 9 | |
| 2809 | P2809 [COCI2011-2012#5] EKO / 砍树 | 17 / 66 | 7 | |
| 3148 | P3148 USACO2011修剪草坪 | 2 / 5 | 10 |
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