| #1629 | 刻录光盘 |
| #1630 | 畅通工程 |
| #1631 | [USACO16DEC]Moocast(gold)奶牛广播-金 |
| #1632 | LJJ算数 |
| #1633 | [USACO16DEC]Cow Checklist奶牛确认单 |
| #1634 | 等式 |
| #1635 | [USACO06DEC]最少的硬币The Fewest Coins |
| #1636 | [USACO06DEC]牛奶模式Milk Patterns |
| #1637 | [USACO06DEC]牛的野餐Cow Picnic |
| #1638 | [USACO06DEC]牛的过山车Cow Roller Coaster |
| #1640 | [USACO06FEB]稳定奶牛分配Steady Cow Assignment |
| #1641 | [USACO06FEB]奶牛零食Treats for the Cows |
| #1642 | [USACO06FEB]摊位预订Stall Reservations |
| #1643 | [USACO06JAN]冗余路径Redundant Paths |
| #1644 | [USACO06JAN]把牛Corral the Cows |
| #1645 | [USACO06JAN]牛的舞会The Cow Prom |
| #1646 | [USACO06JAN]树林The Grove |
| #1647 | [USACO06NOV]路障Roadblocks |
| #1648 | [USACO06NOV]糟糕的一天Bad Hair Day |
| #1649 | [USACO06NOV]大广场Big Square |
| #1650 | [USACO07DEC]观光奶牛Sightseeing Cows |
| #1651 | [USACO07DEC]美食的食草动物Gourmet Grazers |
| #1652 | [USACO07DEC]道路建设Building Roads |
| #1653 | [USACO07FEB]新牛棚Building A New Barn |
| #1654 | [USACO07FEB]牛的词汇The Cow Lexicon |
| #1656 | [USACO07JAN]区间统计Tallest Cow |
| #1657 | [USACO07JAN]平衡的阵容Balanced Lineup |
| #1658 | [USACO07MAR]排名的牛Ranking the Cows |
| #1659 | [USACO07MAR]面对正确的方式Face The Right Way |
| #1660 | [USACO07MAR]每月的费用Monthly Expense |
| #1661 | [USACO07NOV]电话线Telephone Wire |
| #1662 | [USACO07NOV]牛继电器Cow Relays |
| #1663 | [USACO07NOV]防晒霜Sunscreen |
| #1664 | [USACO07NOV]牛栏Cow Hurdles |
| #1665 | 挤牛奶 |
| #1666 | [USACO07OPEN]便宜的回文Cheapest Palindrome |
| #1667 | [USACO07OPEN]吃饭Dining |
| #1668 | [USACO07OPEN]Fliptile |
| #1669 | [USACO08FEB]修路Making the Grade |
| #1670 | [USACO08FEB]酒店Hotel |
| #1671 | [USACO08FEB]流星雨Meteor Shower |
| #1672 | [USACO08FEB]一起吃饭Eating Together |
| #1673 | [USACO08JAN]人工湖Artificial Lake |
| #1674 | [USACO08JAN]haybale猜测Haybale Guessing |
| #1675 | [USACO08MAR]土地征用Land Acquisition |
| #1676 | [USACO08MAR]牛慢跑Cow Jogging |
| #1678 | [USACO08MAR]麻烦的干草打包机The Loathesome Hay Baler |
| #1679 | [USACO08MAR]跨河River Crossing |
| #1680 | [USACO08OPEN]农场危机Crisis on the Farm |
| #1681 | [USACO08OPEN]牛的街区Cow Neighborhoods |
| #1682 | [USACO08OCT]牧场散步Pasture Walking |
| #1683 | [USACO08OCT]车轮旋转Wheel Rotation |
| #1684 | [USACO08NOV]奶牛混合起来Mixed Up Cows |
| #1685 | [USACO08NOV]为母牛欢呼Cheering up the C… |
| #1686 | [USACO08NOV]玩具Toys |
| #1688 | [USACO08NOV]守护农场Guarding the Farm |
| #1689 | [USACO08NOV]时间管理Time Management |
| #1690 | [USACO08DEC]在农场万圣节Trick or Treat on the Farm |
| #1692 | 赏桃 |
| #1693 | [USACO09HOL]牛的打手Cattle Bruisers |
| #1694 | [USACO09HOL]传输延迟Transmission Delay |
| #1695 | [USACO09HOL]假期绘画Holiday Painting |
| #1696 | [USACO09JAN]地震造成的破坏Earthquake Damage |
| #1697 | [USACO09JAN]气象测量The Baric Bovine |
| #1698 | [USACO09JAN]安全出行Safe Travel |
| #1699 | [USACO09JAN]最好的地方Best Spot |
| #1700 | [USACO09JAN]全流Total Flow |
| #1701 | [USACO09JAN]激光电话Laserphones |
| #1702 | [USACO09FEB]股票市场Stock Market |
| #1703 | [USACO09FEB]改造路Revamping Trails |
| #1704 | [USACO09FEB]音乐妖精The Leprechaun |
| #1705 | [USACO09MAR]Moon哞哞叫Moon Mooing |
| #1706 | [USACO09MAR]清理Cleaning Up |
| #1707 | [USACO09MAR]地震损失2Earthquake Damage 2 |
| #1708 | [USACO09MAR]牛飞盘队Cow Frisbee Team |
| #1709 | [USACO09MAR]向右看齐Look Up |
| #1710 | [USACO09OPEN]滑雪课Ski Lessons |
| #1711 | [USACO09OPEN]工作调度Work Scheduling |
| #1712 | [USACO09OPEN]牛绣Bovine Embroidery |
| #1713 | [USACO09OPEN]捉迷藏Hide and Seek |
| #1714 | [USACO09OPEN]移动牛棚Grazing2 |
| #1716 | [USACO09NOV]灯Lights |
| #1718 | [USACO09NOV]硬币的游戏A Coin Game |
| #1719 | [USACO09DEC]牛收费路径Cow Toll Paths |
| #1720 | [USACO09DEC]视频游戏的麻烦Video Game Troubles |
| #1721 | [USACO09DEC]雪橇Bobsledding |
| #1722 | 养牛 |
| #1723 | [USACO10HOL]牛的政治Cow Politics |
| #1724 | [USACO10JAN]轮流Taking Turns |
| #1725 | [USACO10JAN]船舶周围的一个岛屿Shipping Around an Island |
| #1728 | [USACO10FEB]慢下来Slowing down |
| #1729 | 园长的糖果 |
| #1730 | [USACO10FEB]给巧克力Chocolate Giving |
| #1732 | [USACO10MAR]伟大的奶牛聚集Great Cow Gat… |
| #1734 | [USACO10MAR]对速度的需要Need For Speed |
| #1735 | [USACO10OPEN]牛跳房子Cow Hopscotch |
| #1736 | [USACO10OPEN]水滑梯Water Slides |
| #1737 | [USACO10OPEN]三角形计数Triangle Counting |
| #1738 | [USACO10NOV]拜访奶牛Visiting Cows |
| #1739 | [USACO10NOV]巧克力牛奶Chocolate Milk |
HelloWorld信息学奥赛题库