| 1553 | XOR网络省选 | 0 |
| 1554 | 新的词典序省选 | 0 |
| 1555 | KD之死省选 | 0 |
| 1556 | 墓地秘密省选 | 0 |
| 1557 | GC转移省选 | 0 |
| 1558 | [JSOI2009]等差数列省选 | 0 |
| 1559 | [JSOI2009]密码省选 | 0 |
| 1560 | [JSOI2009]火星藏宝图省选 | 0 |
| 1561 | [JSOI2009]去括号省选 | 0 |
| 1562 | [NOI2009]变换序列省选 | 0 |
| 1563 | [NOI2009]诗人小G省选 | 1 |
| 1564 | [NOI2009]二叉查找树省选 | 1 |
| 1565 | [NOI2009]植物大战僵尸省选 | 1 |
| 1566 | [NOI2009]管道取珠省选 | 0 |
| 1567 | [JSOI2008]Blue Mary的战役地图
省选 | 0 |
| 1568 | [JSOI2008]Blue Mary开公司省选 | 1 |
| 1569 | [JSOI2008]Blue Mary的职员分配省选 | 0 |
| 1570 | [JSOI2008]Blue Mary的旅行省选 | 1 |
| 1571 | [Usaco2009 Open]滑雪课Ski省选 | 0 |
| 1572 | [Usaco2009 Open]工作安排Job省选 | 2 |
| 1573 | [Usaco2009 Open]牛绣花cowemb省选 | 0 |
| 1574 | [Usaco2009 Jan]地震损坏Damage省选 | 0 |
| 1575 | [Usaco2009 Jan]气象牛Baric省选 | 0 |
| 1576 | [Usaco2009 Jan]安全路经Travel省选 | 0 |
| 1577 | [Usaco2009 Feb]庙会捷运Fair Shuttle省选 | 0 |
| 1578 | [Usaco2009 Feb]Stock Market 股票市场省选 | 1 |
| 1579 | [Usaco2009 Feb]Revamping Trails 道路升级省选 | 2 |
| 1580 | [Usaco2009 Hol]Cattle Bruisers 杀手游戏省选 | 1 |
| 1581 | [Usaco2009 Hol]Transmission Delay 传输谍延时省选 | 0 |
| 1582 | [Usaco2009 Hol]Holiday Painting 节日画画省选 | 0 |
| 1583 | [Usaco2009 Mar]Moon Mooing 哞哞叫省选 | 0 |
| 1584 | [Usaco2009 Mar]Cleaning Up 打扫卫生省选 | 1 |
| 1585 | [Usaco2009 Mar]Earthquake Damage 2 地震伤害省选 | 1 |
| 1586 | 路径统计path省选 | 0 |
| 1587 | 叶子合并leaves
省选 | 0 |
| 1588 | [HNOI2002]营业额统计省选 | 2 |
| 1589 | [Usaco2008 Dec]Trick or Treat on the Farm 采集糖果省选 | 0 |
| 1590 | [Usaco2008 Dec]Secret Message 秘密信息省选 | 0 |
| 1591 | [Usaco2008 Dec]Largest Fence 最大的围栏省选 | 0 |
| 1592 | [Usaco2008 Feb]Making the Grade 路面修整省选 | 1 |
| 1593 | [Usaco2008 Feb]Hotel 旅馆省选 | 0 |
| 1594 | [Usaco2008 Jan]猜数游戏省选 | 0 |
| 1595 | [Usaco2008 Jan]人工湖省选 | 0 |
| 1596 | [Usaco2008 Jan]电话网络省选 | 2 |
| 1597 | [Usaco2008 Mar]土地购买省选 | 0 |
| 1598 | [Usaco2008 Mar]牛跑步省选 | 0 |
| 1599 | [Usaco2008 Oct]笨重的石子省选 | 0 |
| 1600 | [Usaco2008 Oct]建造栅栏省选 | 0 |
| 1601 | [Usaco2008 Oct]灌水省选 | 1 |
| 1602 | [Usaco2008 Oct]牧场行走省选 | 0 |
