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USACO 历年题目（按难度分类，同难度按时间由近到远）
🟡 普及
lg14974 [USACO26JAN1] Chip Exchange B
lg14976 [USACO26JAN1] Photoshoot B
lg15256 [USACO26JAN2] Purchasing Milk B
lg15570 [USACO26FEB] Make All Distinct B
lg15571 [USACO26FEB] Strange Function B
lg15572 [USACO26FEB] Swap to Win B
lg11668 [USACO25JAN] It's Mooin' Time II B
lg11669 [USACO25JAN] Cow Checkups B
lg11841 [USACO25FEB] Transforming Pairs S
lg10133 [USACO24JAN] Balancing Bacteria B
lg10135 [USACO24JAN] Potion Farming S
lg10275 [USACO24OPEN] Walking Along a Fence B
lg10276 [USACO24OPEN] Farmer John's Favorite Permutation B
lg11449 [USACO24DEC] Roundabount Rounding B
lg11451 [USACO24DEC] It's Mooin' Time B
lg11452 [USACO24DEC] Cake Game S
lg9014 [USACO23JAN] Following Directions S
lg9015 [USACO23JAN] Moo Route S
lg9125 [USACO23FEB] Cow-libi S
lg9974 [USACO23DEC] Candy Cane Feast B
lg9975 [USACO23DEC] Cowntact Tracing 2 B
lg9976 [USACO23DEC] Farmer John Actually Farms B
lg9978 [USACO23DEC] Cycle Correspondence S
lg8092 [USACO22JAN] Drought B
lg8094 [USACO22JAN] Cow Frisbee S
lg8183 [USACO22FEB] Sleeping in Class B
lg8268 [USACO22OPEN] Alchemy B
lg8898 [USACO22DEC] Feeding the Cows B
lg8899 [USACO22DEC] Reverse Engineering B
lg7300 [USACO21JAN] No Time to Paint S
lg7412 [USACO21FEB] Year of the Cow S
lg7556 [USACO21OPEN] Do You Know Your ABCs? S
lg7557 [USACO21OPEN] Acowdemia S
lg7992 [USACO21DEC] Convoluted Intervals S
lg7994 [USACO21DEC] Air Cownditioning B
lg7995 [USACO21DEC] Walking Home B
lg9939 [USACO21OPEN] Acowdemia III B
lg6002 [USACO20JAN] Berry Picking S
lg6145 [USACO20FEB] Timeline G
lg6281 [USACO20OPEN] Social Distancing S
lg6282 [USACO20OPEN] Cereal S
lg7148 [USACO20DEC] Cowntagion S
lg9948 [USACO20JAN] Race B
lg9951 [USACO20FEB] Swapity Swap B
lg9952 [USACO20OPEN] Social Distancing I B
lg9954 [USACO20OPEN] Cowntact Tracing B
lg9957 [USACO20DEC] Stuck in a Rut B
lg1694 [USACO19FEB] The Great Revegetation B
lg1701 [USACO19OPEN] Cow Evolution B
lg5197 [USACO19JAN] Grass Planting S
lg5198 [USACO19JAN] Icy Perimeter S
lg5199 [USACO19JAN] Mountain View S
lg5429 [USACO19OPEN] Fence Planning S
lg5541 [USACO19FEB] Sleepy Cow Herding S
lg5542 [USACO19FEB] Painting The Barn S
lg5836 [USACO19DEC] Milk Visits S
🟢 普及+/提高−
lg14975 [USACO26JAN1] COW Splits B
lg14977 [USACO26JAN1] Lineup Queries S
lg14979 [USACO26JAN1] Sliding Window Summation S
lg15255 [USACO26JAN2] Moo Hunt B
lg15257 [USACO26JAN2] Cow-libi 2 S
lg15258 [USACO26JAN2] Declining Invitations S
lg15259 [USACO26JAN2] Farmer John Loves Rotations S
lg15573 [USACO26FEB] Clash! S
lg15577 [USACO26FEB] Picking Flowers G
lg11667 [USACO25JAN] Astral Superposition B
lg11670 [USACO25JAN] Cow Checkups S
lg11671 [USACO25JAN] Farmer John's Favorite Operation S
lg11674 [USACO25JAN] Reachable Pairs G
lg11838 [USACO25FEB] Printing Sequences B
lg11839 [USACO25FEB] The Best Lineup S
lg11840 [USACO25FEB] Vocabulary Quiz S
lg12024 [USACO25OPEN] It's Mooin' Time III B
lg12026 [USACO25OPEN] Compatible Pairs S
lg12027 [USACO25OPEN] Ski Slope S
lg12028 [USACO25OPEN] Moo Decomposition G
lg10139 [USACO24JAN] Nap Sort G
lg10188 [USACO24FEB] Milk Exchange B
lg10190 [USACO24FEB] Target Practice II S
lg10192 [USACO24FEB] Moorbles S
lg10195 [USACO24FEB] Quantum Moochanics G
lg10274 [USACO24OPEN] Logical Moos B
lg10277 [USACO24OPEN] Bessie's Interview S
lg11453 [USACO24DEC] Deforestation S
lg9016 [USACO23JAN] Find and Replace G
lg9017 [USACO23JAN] Lights Off G
lg9018 [USACO23JAN] Moo Route G
lg9124 [USACO23FEB] Bakery S
lg9126 [USACO23FEB] Moo Route II S
lg9127 [USACO23FEB] Equal Sum Subarrays G
lg9183 [USACO23OPEN] FEB B
lg9184 [USACO23OPEN] Moo Language B
lg9185 [USACO23OPEN] Rotate and Shift B
lg9186 [USACO23OPEN] Milk Sum S
lg9187 [USACO23OPEN] Field Day S
lg9188 [USACO23OPEN] Pareidolia S
lg9977 [USACO23DEC] Bovine Acrobatics S
lg9979 [USACO23DEC] Target Practice S
lg9980 [USACO23DEC] Flight Routes G
lg9982 [USACO23DEC] Haybale Distribution G
lg8093 [USACO22JAN] Searching for Soulmates S
lg8097 [USACO22JAN] Farm Updates G
lg8186 [USACO22FEB] Redistributing Gifts S
lg8188 [USACO22FEB] Email Filing S
lg8191 [USACO22FEB] Moo Network G
lg8266 [USACO22OPEN] Photoshoot B
lg8269 [USACO22OPEN] Visits S
lg8271 [USACO22OPEN] COW Operations S
lg8900 [USACO22DEC] Barn Tree S
lg8901 [USACO22DEC] Circular Barn S
lg8902 [USACO22DEC] Range Reconstruction S
lg7299 [USACO21JAN] Dance Mooves S
lg7301 [USACO21JAN] Spaced Out S
lg7410 [USACO21FEB] Just Green Enough S
lg7411 [USACO21FEB] Comfortable Cows S
lg7555 [USACO21OPEN] Maze Tac Toe S
lg7989 [USACO21DEC] Bracelet Crossings G
lg7991 [USACO21DEC] Connecting Two Barns S
lg6004 [USACO20JAN] Wormhole Sort S
lg6005 [USACO20JAN] Time is Mooney G
lg6146 [USACO20FEB] Help Yourself G
lg6148 [USACO20FEB] Swapity Swapity Swap S
lg6149 [USACO20FEB] Triangles S
lg6150 [USACO20FEB] Clock Tree S
lg6278 [USACO20OPEN] Haircut G
lg7149 [USACO20DEC] Rectangular Pasture S
lg7150 [USACO20DEC] Stuck in a Rut S
lg5196 [USACO19JAN] Cow Poetry G
lg5200 [USACO19JAN] Sleepy Cow Sorting G
lg5201 [USACO19JAN] Shortcut G
lg5202 [USACO19JAN] Redistricting P
lg5424 [USACO19OPEN] Snakes G
lg5425 [USACO19OPEN] I Would Walk 500 Miles G
lg5427 [USACO19OPEN] Left Out S
lg5543 [USACO19FEB] The Great Revegetation S
lg5837 [USACO19DEC] Milk Pumping G
lg6099 [USACO19FEB] Dishwashing G
🩵 提高
lg14978 [USACO26JAN1] Mooclear Reactor S
lg14980 [USACO26JAN1] COW Traversals G
lg14981 [USACO26JAN1] Milk Buckets G
lg14982 [USACO26JAN1] Supervision G
lg15260 [USACO26JAN2] Balancing the Barns G
lg15261 [USACO26JAN2] Lexicographically Smallest Path G
lg15262 [USACO26JAN2] The Chase G
lg15574 [USACO26FEB] Milk Buckets S
lg15575 [USACO26FEB] Point Elimination S
lg15576 [USACO26FEB] Good Cyclic Shifts G
lg15578 [USACO26FEB] Random Tree Generation G
lg11672 [USACO25JAN] Table Recovery S
lg11673 [USACO25JAN] Median Heap G
lg11842 [USACO25FEB] Bessie's Function G
lg12025 [USACO25OPEN] Sequence Construction S
lg12029 [USACO25OPEN] Election Queries G
lg12030 [USACO25OPEN] OohMoo Milk G
lg10134 [USACO24JAN] Cowmpetency S
lg10136 [USACO24JAN] Cowlendar S
lg10137 [USACO24JAN] Walking in Manhattan G
lg10191 [USACO24FEB] Test Tubes S
lg10193 [USACO24FEB] Bessla Motors G
lg10194 [USACO24FEB] Milk Exchange G
lg10278 [USACO24OPEN] Painting Fence Posts S
lg10279 [USACO24OPEN] The 'Winning' Gene S
lg10280 [USACO24OPEN] Cowreography G
lg10282 [USACO24OPEN] Smaller Averages G
lg11454 [USACO24DEC] 2D Conveyer Belt S
lg11455 [USACO24DEC] Cowdepenence G
lg11456 [USACO24DEC] Interstellar Intervals G
lg9013 [USACO23JAN] Find and Replace S
lg9189 [USACO23OPEN] Custodial Cleanup G
lg9190 [USACO23OPEN] Pareidolia G
lg9191 [USACO23OPEN] Tree Merging G
lg9981 [USACO23DEC] Minimum Longest Trip G
lg8095 [USACO22JAN] Cereal 2 S
lg8096 [USACO22JAN] Drought G
lg8187 [USACO22FEB] Robot Instructions S
lg8190 [USACO22FEB] Cow Camp G
lg8270 [USACO22OPEN] Subset Equality S
lg8272 [USACO22OPEN] Apple Catching G
lg8273 [USACO22OPEN] Pair Programming G
lg8274 [USACO22OPEN] Balancing a Tree G
lg8903 [USACO22DEC] Bribing Friends G
lg8904 [USACO22DEC] Mountains G
lg8905 [USACO22DEC] Strongest Friendship Group G
lg8907 [USACO22DEC] Making Friends P
lg7296 [USACO21JAN] Uddered but not Herd G
lg7297 [USACO21JAN] Telephone G
lg7413 [USACO21FEB] Stone Game G
lg7416 [USACO21FEB] No Time to Dry P
lg7527 [USACO21OPEN] United Cows of Farmer John G
lg7528 [USACO21OPEN] Portals G
lg7530 [USACO21OPEN] United Cows of Farmer John P
lg7987 [USACO21DEC] Paired Up G
lg7988 [USACO21DEC] HILO G
lg7990 [USACO21DEC] Closest Cow Wins S
lg6003 [USACO20JAN] Loan Repayment S
lg6006 [USACO20JAN] Farmer John Solves 3SUM G
lg6007 [USACO20JAN] Springboards G
lg6142 [USACO20FEB] Delegation P
lg6143 [USACO20FEB] Equilateral Triangles P
lg6147 [USACO20FEB] Delegation G
lg6275 [USACO20OPEN] Sprinklers 2: Return of the Alfalfa P
lg6279 [USACO20OPEN] Favorite Colors G
lg6280 [USACO20OPEN] Exercise G
lg6283 [USACO20OPEN] The Moo Particle S
lg7151 [USACO20DEC] Replication G
lg5426 [USACO19OPEN] Balancing Inversions G
lg5428 [USACO19OPEN] Cow Steeplechase II S
lg5835 [USACO19DEC] Meetings S
lg5839 [USACO19DEC] Moortal Cowmbat G
lg5851 [USACO19DEC] Greedy Pie Eaters P
lg5852 [USACO19DEC] Bessie's Snow Cow P
lg6100 [USACO19FEB] Painting the Barn G
🔵 提高+/省选−
lg11843 [USACO25FEB] The Best Subsequence G
lg10138 [USACO24JAN] Cowmpetency G
lg9019 [USACO23JAN] Tractor Paths P
lg9128 [USACO23FEB] Fertilizing Pastures G
lg9130 [USACO23FEB] Hungry Cow P
lg9984 [USACO23DEC] A Graph Problem P
lg8906 [USACO22DEC] Breakdown P
lg7293 [USACO21JAN] Sum of Distances P
lg7298 [USACO21JAN] Dance Mooves G
lg7414 [USACO21FEB] Modern Art 3 G
lg7415 [USACO21FEB] Count the Cows G
lg6008 [USACO20JAN] Cave Paintings P
lg7152 [USACO20DEC] Bovine Genetics G
lg7154 [USACO20DEC] Sleeping Cows P
lg5242 [USACO19FEB] Cow Dating P
lg5838 [USACO19DEC] Milk Visits G
lg6098 [USACO19FEB] Cow Land G
🟣 省选/NOI−
lg14983 [USACO26JAN1] Hoof, Paper, Scissors Triples P
lg14984 [USACO26JAN1] Lineup Counting Queries P
lg15263 [USACO26JAN2] Circle of Cows P
lg15579 [USACO26FEB] All Pairs Shortest Paths P
lg15581 [USACO26FEB] Min Max Subarrays II P
lg16572 [USACO26OPEN] Arranging Cows
lg16573 [USACO26OPEN] Haybale Stacks
lg16574 [USACO26OPEN] Perfect Binary Trees
lg11675 [USACO25JAN] Photo Op G
lg11844 [USACO25FEB] Friendship Editing G
lg11845 [USACO25FEB] Min Max Subarrays P
lg11847 [USACO25FEB] True or False Test P
lg12031 [USACO25OPEN] Forklift Certified P
lg12032 [USACO25OPEN] Lazy Sort P
lg10141 [USACO24JAN] Merging Cells P
lg10142 [USACO24JAN] Mooball Teams III P
lg10196 [USACO24FEB] Lazy Cow P
lg10281 [USACO24OPEN] Grass Segments G
lg10283 [USACO24OPEN] Identity Theft P
lg10284 [USACO24OPEN] Splitting Haybales P
lg10285 [USACO24OPEN] Activating Robots P
lg11457 [USACO24DEC] Job Completion G
lg11458 [USACO24DEC] All Pairs Similarity P
lg11459 [USACO24DEC] It's Mooin' Time P
lg9020 [USACO23JAN] Mana Collection P
lg9021 [USACO23JAN] Subtree Activation P
lg9129 [USACO23FEB] Piling Papers G
lg9131 [USACO23FEB] Problem Setting P
lg9132 [USACO23FEB] Watching Cowflix P
lg9192 [USACO23OPEN] Pareidolia P
lg9193 [USACO23OPEN] Good Bitstrings P
lg9985 [USACO23DEC] Train Scheduling P
lg8098 [USACO22JAN] Tests for Haybales G
lg8099 [USACO22JAN] Minimizing Haybales P
lg8100 [USACO22JAN] Counting Haybales P
lg8101 [USACO22JAN] Multiple Choice Test P
lg8193 [USACO22FEB] Sleeping in Class P
lg8277 [USACO22OPEN] Up Down Subsequence P
lg8908 [USACO22DEC] Palindromes P
lg7295 [USACO21JAN] Paint by Letters P
lg7529 [USACO21OPEN] Permutation G
lg7532 [USACO21OPEN] Balanced Subsets P
lg7984 [USACO21DEC] Tickets P
lg7985 [USACO21DEC] Paired Up P
lg7986 [USACO21DEC] HILO P
lg6009 [USACO20JAN] Non-Decreasing Subsequences P
lg6010 [USACO20JAN] Falling Portals P
lg6144 [USACO20FEB] Help Yourself P
lg7153 [USACO20DEC] Square Pasture G
lg5203 [USACO19JAN] Exercise Route P
lg5204 [USACO19JAN] Train Tracking 2 P
lg5243 [USACO19FEB] Moorio Kart P
章节 3. 普及
开放
| 题目 | 尝试 | AC | 难度 |
|---|---|---|---|
| lg14974 [USACO26JAN1] Chip Exchange B | 31 | 12 | 6 |
| lg14976 [USACO26JAN1] Photoshoot B | 27 | 12 | 6 |
| lg15256 [USACO26JAN2] Purchasing Milk B | 29 | 8 | 7 |
| lg15570 [USACO26FEB] Make All Distinct B | 22 | 9 | 7 |
| lg15571 [USACO26FEB] Strange Function B | 16 | 8 | 8 |
| lg15572 [USACO26FEB] Swap to Win B | 16 | 8 | 8 |
| lg11668 *【思维】哞哞叫Ⅱ [USACO25JAN] It's Mooin' Time II B | 58 | 15 | 7 |
| lg11669 *【模拟】序列翻转匹配[USACO25JAN] Cow Checkups B | 23 | 9 | 7 |
| lg11841 *【思维+类gcd】ab变成cd的最少步数[USACO25FEB] Transforming Pairs S | 158 | 34 | 7 |
| lg10133 [USACO24JAN] Balancing Bacteria B【思维】 | 68 | 11 | 8 |
| lg10135 [USACO24JAN] Potion Farming S | 65 | 20 | 6 |
| lg10275 *【模拟】多边形周长上两点距离[USACO24OPEN] Walking Along a Fence B | 62 | 13 | 7 |
| lg10276 *【思维细节】还原序列[USACO24OPEN] Farmer John's Favorite Permutation B | 38 | 14 | 6 |
| lg11449 *【模拟】链式舍入[USACO24DEC] Roundabount Rounding B | 139 | 25 | 8 |
| lg11451 *【模拟】哞哞叫[USACO24DEC] It's Mooin' Time B | 22 | 9 | 7 |
| lg11452 [USACO24DEC] Cake Game S | 78 | 22 | 6 |
| lg9014 [USACO23JAN] Following Directions S | 9 | 5 | 9 |
| lg9015 [USACO23JAN] Moo Route S | 16 | 7 | 8 |
| lg9125 [USACO23FEB] Cow-libi S | 34 | 7 | 8 |
| lg9974 [USACO23DEC] Candy Cane Feast B*【模拟】 | 43 | 12 | 7 |
| lg9975 [USACO23DEC] Cowntact Tracing 2 B | 42 | 8 | 8 |
| lg9976 [USACO23DEC] Farmer John Actually Farms B | 25 | 6 | 8 |
| lg9978 [USACO23DEC] Cycle Correspondence S | 63 | 21 | 6 |
| lg8092 [USACO22JAN] Drought B | 8 | 6 | 9 |
| lg8094 [USACO22JAN] Cow Frisbee S | 14 | 7 | 8 |
| lg8183 [USACO22FEB] Sleeping in Class B | 11 | 5 | 9 |
| lg8268 [USACO22OPEN] Alchemy B | 4 | 4 | 10 |
| lg8898 [USACO22DEC] Feeding the Cows B | 8 | 5 | 10 |
| lg8899 [USACO22DEC] Reverse Engineering B | 13 | 5 | 9 |
| lg7300 [USACO21JAN] No Time to Paint S | 95 | 11 | 8 |
| lg7412 [USACO21FEB] Year of the Cow S | 153 | 10 | 9 |
| lg7556 [USACO21OPEN] Do You Know Your ABCs? S | 25 | 7 | 7 |
| lg7557 [USACO21OPEN] Acowdemia S | 116 | 12 | 9 |
| lg7992 [USACO21DEC] Convoluted Intervals S | 61 | 17 | 6 |
| lg7994 [USACO21DEC] Air Cownditioning B | 10 | 5 | 9 |
| lg7995 [USACO21DEC] Walking Home B | 10 | 5 | 9 |
| lg9939 [USACO21OPEN] Acowdemia III B | 29 | 9 | 7 |
| lg6002 [USACO20JAN] Berry Picking S | 1 | 1 | 10 |
| lg6145 【差分约束】[USACO20FEB] Timeline G | 173 | 21 | 8 |
| lg6281 [USACO20OPEN] Social Distancing S | 13 | 3 | 9 |
| lg6282 [USACO20OPEN] Cereal S | 1 | 1 | 10 |
| lg7148 [USACO20DEC] Cowntagion S | 93 | 14 | 8 |
| lg9948 [USACO20JAN] Race B | 24 | 10 | 6 |
| lg9951 [USACO20FEB] Swapity Swap B | 45 | 15 | 6 |
| lg9952 [USACO20OPEN] Social Distancing I B | 2 | 2 | 10 |
| lg9954 [USACO20OPEN] Cowntact Tracing B | 14 | 6 | 8 |
| lg9957 [USACO20DEC] Stuck in a Rut B | 2 | 2 | 10 |
| lg1694 [USACO19FEB] The Great Revegetation B | 14 | 3 | 9 |
| lg1701 [USACO19OPEN] Cow Evolution B | 50 | 7 | 8 |
| lg5197 [USACO19JAN] Grass Planting S | 2 | 2 | 10 |
| lg5198 [USACO19JAN] Icy Perimeter S | 2 | 2 | 10 |
| lg5199 [USACO19JAN] Mountain View S | 2 | 2 | 10 |
| lg5429 [USACO19OPEN] Fence Planning S | 1 | 1 | 10 |
| lg5541 [USACO19FEB] Sleepy Cow Herding S | 1 | 1 | 10 |
| lg5542 [USACO19FEB] Painting The Barn S | 7 | 2 | 10 |
| lg5836 [USACO19DEC] Milk Visits S | 5 | 2 | 10 |
章节 4. 普及+/提高−
开放
| 题目 | 尝试 | AC | 难度 |
|---|---|---|---|
| lg14975 [USACO26JAN1] COW Splits B | 3 | 1 | 10 |
| lg14977 [USACO26JAN1] Lineup Queries S | 70 | 12 | 8 |
| lg14979 [USACO26JAN1] Sliding Window Summation S | 15 | 9 | 7 |
| lg15255 [USACO26JAN2] Moo Hunt B | 2 | 1 | 10 |
| lg15257 [USACO26JAN2] Cow-libi 2 S | 78 | 10 | 8 |
| lg15258 [USACO26JAN2] Declining Invitations S | 12 | 6 | 9 |
| lg15259 [USACO26JAN2] Farmer John Loves Rotations S | 24 | 6 | 8 |
| lg15573 [USACO26FEB] Clash! S | 35 | 5 | 8 |
| lg15577 [USACO26FEB] Picking Flowers G | 67 | 8 | 8 |
| lg11667 *【模拟】图形重叠分析[USACO25JAN] Astral Superposition B | 67 | 10 | 8 |
| lg11670 [USACO25JAN] Cow Checkups S | 198 | 25 | 8 |
| lg11671 [USACO25JAN] Farmer John's Favorite Operation S | 200 | 23 | 9 |
| lg11674 [USACO25JAN] Reachable Pairs G | 93 | 11 | 8 |
| lg11838 *【动态规划：区间中间推】打印语句最少[USACO25FEB] Printing Sequences B | 13 | 5 | 9 |
| lg11839 [USACO25FEB] The Best Lineup S | 210 | 27 | 8 |
| lg11840 *【树上模拟】确定学生编号[USACO25FEB] Vocabulary Quiz S | 124 | 30 | 7 |
| lg12024 [USACO25OPEN] It's Mooin' Time III B | 3 | 1 | 10 |
| lg12026 *【贪心】配对[USACO25OPEN] Compatible Pairs S | 76 | 25 | 6 |
| lg12027 [USACO25OPEN] Ski Slope S | 34 | 16 | 5 |
| lg12028 *【组合数：综合计算】M OO…O的方案数[USACO25OPEN] Moo Decomposition G | 39 | 20 | 4 |
| lg10139 [USACO24JAN] Nap Sort G | 36 | 7 | 8 |
| lg10188 【思维细节】交换牛奶[USACO24FEB] Milk Exchange B | 83 | 15 | 8 |
| lg10190 [USACO24FEB] Target Practice II S | 41 | 6 | 8 |
| lg10192 [USACO24FEB] Moorbles S | 86 | 11 | 8 |
| lg10195 [USACO24FEB] Quantum Moochanics G | 15 | 4 | 9 |
| lg10274 *【思维细节】布尔语句替换[USACO24OPEN] Logical Moos B | 42 | 9 | 7 |
| lg10277 [USACO24OPEN] Bessie's Interview S | 70 | 24 | 6 |
| lg11453 *【差分约束】[USACO24DEC] Deforestation S | 94 | 7 | 9 |
| lg9016 [USACO23JAN] Find and Replace G | 19 | 9 | 7 |
| lg9017 [USACO23JAN] Lights Off G | 39 | 10 | 7 |
| lg9018 [USACO23JAN] Moo Route G | 17 | 10 | 6 |
| lg9124 [USACO23FEB] Bakery S | 32 | 7 | 8 |
| lg9126 [USACO23FEB] Moo Route II S | 26 | 9 | 7 |
| lg9127 [USACO23FEB] Equal Sum Subarrays G | 19 | 9 | 7 |
| lg9183 [USACO23OPEN] FEB B | 12 | 6 | 9 |
| lg9184 [USACO23OPEN] Moo Language B | 26 | 3 | 9 |
| lg9185 [USACO23OPEN] Rotate and Shift B | 10 | 4 | 9 |
| lg9186 [USACO23OPEN] Milk Sum S | 20 | 8 | 7 |
| lg9187 [USACO23OPEN] Field Day S | 17 | 8 | 7 |
| lg9188 [USACO23OPEN] Pareidolia S | 18 | 5 | 8 |
| lg9977 [USACO23DEC] Bovine Acrobatics S | 58 | 19 | 6 |
| lg9979 [USACO23DEC] Target Practice S | 100 | 11 | 9 |
| lg9980 [USACO23DEC] Flight Routes G | 17 | 7 | 8 |
| lg9982 [USACO23DEC] Haybale Distribution G | 27 | 5 | 8 |
| lg8093 [USACO22JAN] Searching for Soulmates S | 13 | 7 | 8 |
| lg8097 [USACO22JAN] Farm Updates G | 17 | 6 | 8 |
| lg8186 [USACO22FEB] Redistributing Gifts S | 36 | 13 | 6 |
| lg8188 [USACO22FEB] Email Filing S | 208 | 5 | 10 |
| lg8191 D136 【最小生成树】[USACO22FEB] Moo Network G | 35 | 4 | 9 |
| lg8266 [USACO22OPEN] Photoshoot B | 11 | 5 | 9 |
| lg8269 [USACO22OPEN] Visits S | 13 | 5 | 9 |
| lg8271 [USACO22OPEN] COW Operations S | 5 | 3 | 10 |
| lg8900 [USACO22DEC] Barn Tree S | 29 | 7 | 7 |
| lg8901 [USACO22DEC] Circular Barn S | 13 | 6 | 8 |
| lg8902 [USACO22DEC] Range Reconstruction S | 17 | 4 | 9 |
| lg7299 [USACO21JAN] Dance Mooves S | 97 | 11 | 9 |
| lg7301 [USACO21JAN] Spaced Out S | 20 | 7 | 8 |
| lg7410 [USACO21FEB] Just Green Enough S | 101 | 8 | 9 |
| lg7411 [USACO21FEB] Comfortable Cows S | 90 | 7 | 9 |
| lg7555 [USACO21OPEN] Maze Tac Toe S | 25 | 9 | 7 |
| lg7989 [USACO21DEC] Bracelet Crossings G | 6 | 4 | 10 |
| lg7991 [USACO21DEC] Connecting Two Barns S | 16 | 4 | 9 |
| lg6004 [USACO20JAN] Wormhole Sort S | 1 | 1 | 10 |
| lg6005 [USACO20JAN] Time is Mooney G | 4 | 3 | 10 |
| lg6146 [USACO20FEB] Help Yourself G | 2 | 2 | 10 |
| lg6148 [USACO20FEB] Swapity Swapity Swap S | 2 | 2 | 10 |
| lg6149 [USACO20FEB] Triangles S | 3 | 2 | 10 |
| lg6150 [USACO20FEB] Clock Tree S | 45 | 12 | 7 |
| lg6278 [USACO20OPEN] Haircut G | 4 | 3 | 10 |
| lg7149 [USACO20DEC] Rectangular Pasture S | 57 | 9 | 8 |
| lg7150 [USACO20DEC] Stuck in a Rut S | 29 | 12 | 6 |
| lg5196 [USACO19JAN] Cow Poetry G | 1 | 1 | 10 |
| lg5200 [USACO19JAN] Sleepy Cow Sorting G | 1 | 1 | 10 |
| lg5201 [USACO19JAN] Shortcut G | 1 | 1 | 10 |
| lg5202 [USACO19JAN] Redistricting P | 1 | 1 | 10 |
| lg5424 [USACO19OPEN] Snakes G | 19 | 11 | 6 |
| lg5425 D135 最小生成树 Prim 算法[USACO19OPEN] I Would Walk 500 Miles G | 74 | 12 | 8 |
| lg5427 [USACO19OPEN] Left Out S | 1 | 1 | 10 |
| lg5543 [USACO19FEB] The Great Revegetation S | 4 | 2 | 10 |
| lg5837 [USACO19DEC] Milk Pumping G | 1 | 1 | 10 |
| lg6099 [USACO19FEB] Dishwashing G | 57 | 11 | 8 |
章节 5. 提高
开放
| 题目 | 尝试 | AC | 难度 |
|---|---|---|---|
| lg14978 [USACO26JAN1] Mooclear Reactor S | 37 | 8 | 7 |
| lg14980 [USACO26JAN1] COW Traversals G | 15 | 4 | 9 |
| lg14981 [USACO26JAN1] Milk Buckets G | 15 | 5 | 8 |
| lg14982 [USACO26JAN1] Supervision G | 6 | 3 | 10 |
| lg15260 [USACO26JAN2] Balancing the Barns G | 40 | 4 | 9 |
| lg15261 [USACO26JAN2] Lexicographically Smallest Path G | 30 | 2 | 9 |
| lg15262 [USACO26JAN2] The Chase G | 13 | 3 | 9 |
| lg15574 [USACO26FEB] Milk Buckets S | 25 | 5 | 8 |
| lg15575 [USACO26FEB] Point Elimination S | 29 | 5 | 8 |
| lg15576 [USACO26FEB] Good Cyclic Shifts G | 50 | 7 | 8 |
| lg15578 [USACO26FEB] Random Tree Generation G | 10 | 6 | 9 |
| lg11672 [USACO25JAN] Table Recovery S | 99 | 18 | 8 |
| lg11673 [USACO25JAN] Median Heap G | 22 | 6 | 8 |
| lg11842 *【树形DP：相邻点兼容】基环树森林最小点权和[USACO25FEB] Bessie's Function G | 279 | 30 | 9 |
| lg12025 [USACO25OPEN] Sequence Construction S | 51 | 16 | 6 |
| lg12029 [USACO25OPEN] Election Queries G | 37 | 6 | 8 |
| lg12030 [USACO25OPEN] OohMoo Milk G | 17 | 3 | 9 |
| lg10134 [USACO24JAN] Cowmpetency S | 27 | 7 | 7 |
| lg10136 [USACO24JAN] Cowlendar S | 48 | 14 | 6 |
| lg10137 [USACO24JAN] Walking in Manhattan G | 19 | 4 | 9 |
| lg10191 [USACO24FEB] Test Tubes S(spj) | 43 | 2 | 9 |
| lg10193 [USACO24FEB] Bessla Motors G | 10 | 4 | 9 |
| lg10194 [USACO24FEB] Milk Exchange G | 14 | 6 | 8 |
| lg10278 [USACO24OPEN] Painting Fence Posts S | 44 | 8 | 8 |
| lg10279 [USACO24OPEN] The 'Winning' Gene S | 53 | 12 | 7 |
| lg10280 [USACO24OPEN] Cowreography G | 19 | 8 | 7 |
| lg10282 [USACO24OPEN] Smaller Averages G | 14 | 7 | 8 |
| lg11454 [USACO24DEC] 2D Conveyer Belt S | 29 | 8 | 7 |
| lg11455 [USACO24DEC] Cowdepenence G | 13 | 4 | 9 |
| lg11456 [USACO24DEC] Interstellar Intervals G | 20 | 3 | 9 |
| lg9013 [USACO23JAN] Find and Replace S | 37 | 7 | 8 |
| lg9189 [USACO23OPEN] Custodial Cleanup G | 12 | 5 | 9 |
| lg9190 [USACO23OPEN] Pareidolia G | 24 | 14 | 5 |
| lg9191 [USACO23OPEN] Tree Merging G | 3 | 1 | 10 |
| lg9981 [USACO23DEC] Minimum Longest Trip G | 27 | 5 | 8 |
| lg8095 [USACO22JAN] Cereal 2 S | 8 | 3 | 10 |
| lg8096 [USACO22JAN] Drought G | 7 | 6 | 9 |
| lg8187 [USACO22FEB] Robot Instructions S | 11 | 3 | 9 |
| lg8190 [USACO22FEB] Cow Camp G | 19 | 3 | 9 |
| lg8270 [USACO22OPEN] Subset Equality S | 8 | 4 | 10 |
| lg8272 [USACO22OPEN] Apple Catching G | 9 | 5 | 9 |
| lg8273 [USACO22OPEN] Pair Programming G | 9 | 2 | 10 |
| lg8274 [USACO22OPEN] Balancing a Tree G | 9 | 2 | 10 |
| lg8903 [USACO22DEC] Bribing Friends G | 23 | 7 | 7 |
| lg8904 *【STL：set】[USACO22DEC] Mountains G | 52 | 13 | 7 |
| lg8905 [USACO22DEC] Strongest Friendship Group G | 15 | 6 | 8 |
| lg8907 [USACO22DEC] Making Friends P | 21 | 6 | 8 |
| lg7296 [USACO21JAN] Uddered but not Herd G | 1 | 1 | 10 |
| lg7297 [USACO21JAN] Telephone G | 8 | 6 | 9 |
| lg7413 [USACO21FEB] Stone Game G | 1 | 1 | 10 |
| lg7416 [USACO21FEB] No Time to Dry P | 28 | 8 | 7 |
| lg7527 [USACO21OPEN] United Cows of Farmer John G | 11 | 7 | 8 |
| lg7528 D143 最小生成树 Kruskal 算法 [USACO21OPEN] Portals G | 5 | 3 | 10 |
| lg7530 [USACO21OPEN] United Cows of Farmer John P | 77 | 10 | 8 |
| lg7987 [USACO21DEC] Paired Up G | 9 | 3 | 10 |
| lg7988 [USACO21DEC] HILO G | 3 | 3 | 10 |
| lg7990 [USACO21DEC] Closest Cow Wins S | 4 | 2 | 10 |
| lg6003 [USACO20JAN] Loan Repayment S | 1 | 1 | 10 |
| lg6006 [USACO20JAN] Farmer John Solves 3SUM G | 1 | 1 | 10 |
| lg6007 [USACO20JAN] Springboards G | 2 | 1 | 10 |
| lg6142 [USACO20FEB] Delegation P | 32 | 10 | 7 |
| lg6143 [USACO20FEB] Equilateral Triangles P | 33 | 9 | 7 |
| lg6147 [USACO20FEB] Delegation G | 33 | 11 | 6 |
| lg6275 [USACO20OPEN] Sprinklers 2: Return of the Alfalfa P | 24 | 10 | 6 |
| lg6279 [USACO20OPEN] Favorite Colors G | 9 | 8 | 9 |
| lg6280 [USACO20OPEN] Exercise G | 36 | 12 | 6 |
| lg6283 [USACO20OPEN] The Moo Particle S | 48 | 13 | 7 |
| lg7151 [USACO20DEC] Replication G | 1 | 1 | 10 |
| lg5426 [USACO19OPEN] Balancing Inversions G | 36 | 7 | 8 |
| lg5428 [USACO19OPEN] Cow Steeplechase II S | 1 | 1 | 10 |
| lg5835 [USACO19DEC] Meetings S | 26 | 6 | 8 |
| lg5839 [USACO19DEC] Moortal Cowmbat G | 2 | 1 | 10 |
| lg5851 [USACO19DEC] Greedy Pie Eaters P | 2 | 2 | 10 |
| lg5852 [USACO19DEC] Bessie's Snow Cow P | 1 | 1 | 10 |
| lg6100 [USACO19FEB] Painting the Barn G | 63 | 8 | 8 |
章节 6. 提高+/省选−
开放
| 题目 | 尝试 | AC | 难度 |
|---|---|---|---|
| lg11843 [USACO25FEB] The Best Subsequence G | 42 | 5 | 9 |
| lg10138 [USACO24JAN] Cowmpetency G | 32 | 8 | 7 |
| lg9019 [USACO23JAN] Tractor Paths P | 20 | 7 | 8 |
| lg9128 [USACO23FEB] Fertilizing Pastures G | 35 | 7 | 8 |
| lg9130 [USACO23FEB] Hungry Cow P | 21 | 6 | 8 |
| lg9984 [USACO23DEC] A Graph Problem P | 7 | 3 | 10 |
| lg8906 [USACO22DEC] Breakdown P | 18 | 6 | 8 |
| lg7293 [USACO21JAN] Sum of Distances P | 29 | 5 | 8 |
| lg7298 [USACO21JAN] Dance Mooves G | 2 | 1 | 10 |
| lg7414 [USACO21FEB] Modern Art 3 G | 1 | 1 | 10 |
| lg7415 [USACO21FEB] Count the Cows G | 1 | 1 | 10 |
| lg6008 [USACO20JAN] Cave Paintings P | 30 | 10 | 6 |
| lg7152 [USACO20DEC] Bovine Genetics G | 3 | 1 | 10 |
| lg7154 [USACO20DEC] Sleeping Cows P | 40 | 9 | 7 |
| lg5242 [USACO19FEB] Cow Dating P | 5 | 2 | 10 |
| lg5838 [USACO19DEC] Milk Visits G | 1 | 1 | 10 |
| lg6098 [USACO19FEB] Cow Land G | 1 | 1 | 10 |
章节 7. 省选/NOI−
开放
| 题目 | 尝试 | AC | 难度 |
|---|---|---|---|
| lg14983 [USACO26JAN1] Hoof, Paper, Scissors Triples P | 3 | 1 | 10 |
| lg14984 [USACO26JAN1] Lineup Counting Queries P | 3 | 1 | 10 |
| lg15263 [USACO26JAN2] Circle of Cows P | 2 | 1 | 10 |
| lg15579 [USACO26FEB] All Pairs Shortest Paths P | 1 | 1 | 10 |
| lg15581 [USACO26FEB] Min Max Subarrays II P | 1 | 1 | 10 |
| lg16572 [USACO26OPEN] Arranging Cows | 1 | 1 | 10 |
| lg16573 [USACO26OPEN] Haybale Stacks | 4 | 1 | 10 |
| lg16574 [USACO26OPEN] Perfect Binary Trees | 11 | 1 | 10 |
| lg11675 [USACO25JAN] Photo Op G | 15 | 4 | 9 |
| lg11844 [USACO25FEB] Friendship Editing G | 15 | 8 | 7 |
| lg11845 [USACO25FEB] Min Max Subarrays P | 16 | 3 | 9 |
| lg11847 [USACO25FEB] True or False Test P | 9 | 2 | 10 |
| lg12031 [USACO25OPEN] Forklift Certified P | 18 | 3 | 9 |
| lg12032 [USACO25OPEN] Lazy Sort P | 25 | 2 | 9 |
| lg10141 [USACO24JAN] Merging Cells P | 13 | 3 | 9 |
| lg10142 [USACO24JAN] Mooball Teams III P | 24 | 6 | 8 |
| lg10196 [USACO24FEB] Lazy Cow P | 38 | 4 | 9 |
| lg10281 [USACO24OPEN] Grass Segments G | 20 | 7 | 8 |
| lg10283 [USACO24OPEN] Identity Theft P | 24 | 6 | 8 |
| lg10284 [USACO24OPEN] Splitting Haybales P | 22 | 5 | 8 |
| lg10285 [USACO24OPEN] Activating Robots P | 39 | 3 | 9 |
| lg11457 *【反悔贪心】[USACO24DEC] Job Completion G | 380 | 52 | 8 |
| lg11458 [USACO24DEC] All Pairs Similarity P | 12 | 3 | 9 |
| lg11459 [USACO24DEC] It's Mooin' Time P | 10 | 3 | 10 |
| lg9020 [USACO23JAN] Mana Collection P | 33 | 6 | 8 |
| lg9021 [USACO23JAN] Subtree Activation P | 52 | 9 | 8 |
| lg9129 [USACO23FEB] Piling Papers G | 15 | 7 | 8 |
| lg9131 [USACO23FEB] Problem Setting P | 16 | 5 | 8 |
| lg9132 [USACO23FEB] Watching Cowflix P | 19 | 4 | 9 |
| lg9192 [USACO23OPEN] Pareidolia P | 10 | 4 | 9 |
| lg9193 [USACO23OPEN] Good Bitstrings P | 5 | 5 | 10 |
| lg9985 [USACO23DEC] Train Scheduling P | 10 | 3 | 10 |
| lg8098 [USACO22JAN] Tests for Haybales G | 12 | 3 | 9 |
| lg8099 [USACO22JAN] Minimizing Haybales P | 12 | 5 | 9 |
| lg8100 [USACO22JAN] Counting Haybales P | 12 | 10 | 8 |
| lg8101 [USACO22JAN] Multiple Choice Test P | 19 | 6 | 8 |
| lg8193 [USACO22FEB] Sleeping in Class P | 158 | 7 | 9 |
| lg8277 [USACO22OPEN] Up Down Subsequence P | 10 | 4 | 9 |
| lg8908 [USACO22DEC] Palindromes P | 23 | 6 | 8 |
| lg7295 [USACO21JAN] Paint by Letters P | 12 | 2 | 10 |
| lg7529 [USACO21OPEN] Permutation G | 1 | 1 | 10 |
| lg7532 [USACO21OPEN] Balanced Subsets P | 46 | 8 | 8 |
| lg7984 [USACO21DEC] Tickets P | 4 | 3 | 10 |
| lg7985 [USACO21DEC] Paired Up P | 4 | 3 | 10 |
| lg7986 [USACO21DEC] HILO P | 4 | 2 | 10 |
| lg6009 [USACO20JAN] Non-Decreasing Subsequences P | 35 | 8 | 7 |
| lg6010 [USACO20JAN] Falling Portals P | 59 | 8 | 8 |
| lg6144 [USACO20FEB] Help Yourself P | 46 | 8 | 8 |
| lg7153 [USACO20DEC] Square Pasture G | 1 | 1 | 10 |
| lg5203 [USACO19JAN] Exercise Route P | 13 | 6 | 8 |
| lg5204 [USACO19JAN] Train Tracking 2 P | 3 | 2 | 10 |
| lg5243 [USACO19FEB] Moorio Kart P | 6 | 2 | 10 |