《USACO》铂金组（优质题源）

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USACO Platinum 历年真题（按提供顺序）

-loj5595 「USACO 2026 First Platinum」Hoof, Paper, Scissors Triples
-loj5596 「USACO 2026 First Platinum」Lineup Counting Queries
-loj5597 「USACO 2026 First Platinum」Pluses and Minuses
-loj5598 「USACO 2026 Second Platinum」Circle of Cows
-loj5599 「USACO 2026 Second Platinum」Cow Circle
-loj5600 「USACO 2026 Second Platinum」Dynamic Instability
-loj5631 「USACO 2026 Third Platinum」All Pairs Shortest Paths
-loj5632 「USACO 2026 Third Platinum」Blast Damage
-loj5633 「USACO 2026 Third Platinum」Min Max Subarrays II

-loj4882 「USACO 2025 US Open Platinum」Forklift Certified
-loj4883 「USACO 2025 US Open Platinum」Lazy Sort
-loj4884 「USACO 2025 US Open Platinum」Package Pickup
-loj4811 「USACO 2025.2 Platinum」Min Max Subarrays
-loj4812 「USACO 2025.2 Platinum」Transforming Pairs
-loj4813 「USACO 2025.2 Platinum」True or False Test
-loj4778 「USACO 2025.1 Platinum」DFS Order
-loj4779 「USACO 2025.1 Platinum」Shock Wave
-loj4780 「USACO 2025.1 Platinum」Watering the Plants
-loj4762 「USACO 2024.12 Platinum」All Pairs Similarity
-loj4763 「USACO 2024.12 Platinum」It's Mooin' Time
-loj4764 「USACO 2024.12 Platinum」Maximize Minimum Difference
-loj4120 「USACO 2024 US Open Platinum」Identity Theft
-loj4121 「USACO 2024 US Open Platinum」Splitting Haybales
-loj4122 「USACO 2024 US Open Platinum」Activating Robots
-loj4097 「USACO 2024.2 Platinum」Lazy Cow
-loj4098 「USACO 2024.2 Platinum」Minimum Sum of Maximums
-loj4099 「USACO 2024.2 Platinum」Infinite Adventure
-loj4086 「USACO 2024.1 Platinum」Island Vacation
-loj4087 「USACO 2024.1 Platinum」Merging Cells
-loj4088 「USACO 2024.1 Platinum」Mooball Teams III
-loj4008 「USACO 2023.12 Platinum」Cowntact Tracing
-loj4009 「USACO 2023.12 Platinum」A Graph Problem
-loj4010 「USACO 2023.12 Platinum」Train Scheduling
-loj3961 「USACO 2023 US Open Platinum」Pareidolia
-loj3962 「USACO 2023 US Open Platinum」Good Bitstrings
-loj3963 「USACO 2023 US Open Platinum」Triples of Cows
-loj3949 「USACO 2023.2 Platinum」Hungry Cow
-loj3950 「USACO 2023.2 Platinum」Problem Setting
-loj3951 「USACO 2023.2 Platinum」Watching Cowflix
-loj3934 「USACO 2023.1 Platinum」Tractor Paths
-loj3935 「USACO 2023.1 Platinum」Mana Collection
-loj3936 「USACO 2023.1 Platinum」Subtree Activation
-loj3922 「USACO 2022.12 Platinum」Breakdown
-loj3923 「USACO 2022.12 Platinum」Making Friends
-loj3924 「USACO 2022.12 Platinum」Palindromes
-loj3697 「USACO 2022 US Open Platinum」262144 Revisited
-loj3698 「USACO 2022 US Open Platinum」Hoof and Brain
-loj3699 「USACO 2022 US Open Platinum」Up Down Subsequence
-loj3667 「USACO 2022.2 Platinum」Paint by Rectangles
-loj3668 「USACO 2022.2 Platinum」Sleeping in Class
-loj3669 「USACO 2022.2 Platinum」Phone Numbers
-loj3623 「USACO 2022.1 Platinum」Minimizing Haybales
-loj3624 「USACO 2022.1 Platinum」Counting Haybales
-loj3625 「USACO 2022.1 Platinum」Multiple Choice Test
-loj3574 「USACO 2021.12 Platinum」Tickets
-loj3575 「USACO 2021.12 Platinum」Paired Up
-loj3576 「USACO 2021.12 Platinum」HILO
-loj3511 「USACO 2021 US Open Platinum」United Cows of Farmer John
-loj3512 「USACO 2021 US Open Platinum」Routing Schemes
-loj3513 「USACO 2021 US Open Platinum」Balanced Subsets
-loj3481 「USACO 2021.2 Platinum」No Time to Dry
-loj3482 「USACO 2021.2 Platinum」Minimizing Edges
-loj3483 「USACO 2021.2 Platinum」Counting Graphs
-loj3459 「USACO 2021.1 Platinum」Sum of Distances
-loj3460 「USACO 2021.1 Platinum」Minimum Cost Paths
-loj3461 「USACO 2021.1 Platinum」Paint by Letters
-loj3450 「USACO 2020.12 Platinum」Sleeping Cows
-loj3451 「USACO 2020.12 Platinum」Spaceship
-loj3452 「USACO 2020.12 Platinum」Cowmistry
-loj3283 「USACO 2020 US Open Platinum」Sprinklers 2: Return of the Alfalfa
-loj3284 「USACO 2020 US Open Platinum」Exercise
-loj3285 「USACO 2020 US Open Platinum」Circus
-loj3265 「USACO 2020.2 Platinum」Delegation
-loj3266 「USACO 2020.2 Platinum」Equilateral Triangles
-loj3267 「USACO 2020.2 Platinum」Help Yourself
-loj3246 「USACO 2020.1 Platinum」Cave Paintings
-loj3247 「USACO 2020.1 Platinum」Non-Decreasing Subsequences
-loj3248 「USACO 2020.1 Platinum」Falling Portals
-loj3226 「USACO 2019.12 Platinum」Greedy Pie Eaters
-loj3227 「USACO 2019.12 Platinum」Bessie's Snow Cow
-loj3228 「USACO 2019.12 Platinum」Tree Depth
-loj3769 「USACO 2019 US Open Platinum」Compound Escape
-loj3770 「USACO 2019 US Open Platinum」Valleys
-loj3765 「USACO 2019.2 Platinum」Cow Dating
-loj3766 「USACO 2019.2 Platinum」Moorio Kart
-loj3767 「USACO 2019.2 Platinum」Mowing Mischief
-loj3168 「USACO 2019.1 Platinum」Redistricting
-loj3169 「USACO 2019.1 Platinum」Exercise Route
-loj3170 「USACO 2019.1 Platinum」Train Tracking 2
-loj2282 「USACO 2018.12 Platinum」Balance Beam
-loj2283 「USACO 2018.12 Platinum」Sort It Out
-loj2284 「USACO 2018.12 Platinum」The Cow Gathering
-loj2869 「USACO 2018 US Open Platinum」Out of Sorts
-loj2870 「USACO 2018 US Open Platinum」Train Tracking
-loj2871 「USACO 2018 US Open Platinum」Disruption
-loj3589 「USACO 2018.02 Platinum」Slingshot
-loj3590 「USACO 2018.02 Platinum」New Barns
-loj3591 「USACO 2018.02 Platinum」Cow Gymnasts
-loj2385 「USACO 2018.01 Platinum」Lifeguards
-loj2386 「USACO 2018.01 Platinum」Cow at Large
-loj2387 「USACO 2018.01 Platinum」Sprinklers
-loj2388 「USACO 2017.12 Platinum」Standing Out from the Herd
-loj2376 「USACO 2017.12 Platinum」Push a Box
-loj2337 「USACO 2017.12 Platinum」Greedy Gift Takers
-P7169 [USACO17OPEN] Modern Art P
-P7170 [USACO17OPEN] Switch Grass P
-P7171 [USACO17OPEN] COWBASIC P
-P7178 *【树状数组】最少交叉[USACO17FEB] Why Did the Cow Cross the Road I P
-P7179 [USACO17FEB] Why Did the Cow Cross the Road II P
-P7180 [USACO17FEB] Why Did the Cow Cross the Road III P
-P6756 C87*【树状数组+DFS】统计子树i中点权比wi大的点数[USACO17JAN] Promotion Counting P
-P7188 [USACO17JAN] Building a Tall Barn P
-P7189 [USACO17JAN] Subsequence Reversal P
-P7196 [USACO16DEC] Lots of Triangles P
-P7197 [USACO16DEC] Team Building P
-P7198 [USACO16DEC] Robotic Cow Herd P
-loj2417 「USACO 2016 US Open, Platinum」262144
-loj2418 「USACO 2016 US Open, Platinum」Bull in a China Shop
-loj2419 「USACO 2016 US Open, Platinum」Landscaping
-P7025 [USACO16FEB] Load Balancing P
-P7026 [USACO16FEB] Fenced In P
-P7027 [USACO16FEB] Circular Barn P
-P7034 *【动态规划：区间一维一边推】最大子矩阵2️⃣[USACO16JAN] Fort Moo P
-P7035 [USACO16JAN] Mowing the Field P
-P7036 [USACO16JAN] Lights Out P
-P6390 A11*【树上点差分】树上路径修改和点查询1[USACO15DEC] Max Flow P
-P7044 *【模拟+set】[USACO15DEC] High Card Low Card P
-P7045 C02*【线段树】一维区间修改+区间询问[USACO15DEC] Counting Haybale P

章节 1. USACO Platinum 历年真题（按提供顺序）

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
lg14985   [USACO26JAN1] Pluses and Minuses P 5 2 10
lg15263   [USACO26JAN2] Circle of Cows P 2 1 10
lg15264   [USACO26JAN2] Cow Circle P 3 1 10
lg15265   [USACO26JAN2] Dynamic Instability P 3 1 10
lg15579   [USACO26FEB] All Pairs Shortest Paths P 1 1 10
lg15580   [USACO26FEB] Blast Damage P 1 1 10
lg15581   [USACO26FEB] Min Max Subarrays II P 1 1 10
lg12031   [USACO25OPEN] Forklift Certified P 18 3 9
lg12032   [USACO25OPEN] Lazy Sort P 25 2 9
lg12033   [USACO25OPEN] Package Pickup P 5 1 10
lg11845   [USACO25FEB] Min Max Subarrays P 16 3 9
lg11846   [USACO25FEB] Transforming Pairs P 5 1 10
lg11847   [USACO25FEB] True or False Test P 9 2 10
lg11676   [USACO25JAN] DFS Order P 8 3 10
lg11677   [USACO25JAN] Shock Wave P 1 1 10
lg11678   [USACO25JAN] Watering the Plants P 4 1 10
lg11458   [USACO24DEC] All Pairs Similarity P 12 3 9
lg11459   [USACO24DEC] It's Mooin' Time P 10 3 10
lg11460   [USACO24DEC] Maximize Minimum Difference P 8 1 10
lg10283   [USACO24OPEN] Identity Theft P 24 6 8
lg10284   [USACO24OPEN] Splitting Haybales P 22 5 8
lg10285   [USACO24OPEN] Activating Robots P 39 3 9
lg10196   [USACO24FEB] Lazy Cow P 38 4 9
lg10197   [USACO24FEB] Minimum Sum of Maximums P 13 2 9
lg10198   [USACO24FEB] Infinite Adventure P 4 2 10
lg10140   [USACO24JAN] Island Vacation P 14 2 9
lg10141   [USACO24JAN] Merging Cells P 13 3 9
lg10142   [USACO24JAN] Mooball Teams III P 24 6 8
lg9983   [USACO23DEC] Cowntact Tracing P 5 2 10
lg9984   [USACO23DEC] A Graph Problem P 7 3 10
lg9985   [USACO23DEC] Train Scheduling P 10 3 10
lg9192   [USACO23OPEN] Pareidolia P 10 4 9
lg9193   [USACO23OPEN] Good Bitstrings P 5 5 10
lg9194   [USACO23OPEN] Triples of Cows P 5 3 10
lg9130   [USACO23FEB] Hungry Cow P 21 6 8
lg9131   [USACO23FEB] Problem Setting P 16 5 8
lg9132   [USACO23FEB] Watching Cowflix P 19 4 9
lg9019   [USACO23JAN] Tractor Paths P 20 7 8
lg9020   [USACO23JAN] Mana Collection P 33 6 8
lg9021   [USACO23JAN] Subtree Activation P 52 9 8
lg8906   [USACO22DEC] Breakdown P 18 6 8
lg8907   [USACO22DEC] Making Friends P 21 6 8
lg8908   [USACO22DEC] Palindromes P 23 6 8
lg8275   [USACO22OPEN] 262144 Revisited P 21 2 9
lg8276   [USACO22OPEN] Hoof and Brain P 10 5 9
lg8277   [USACO22OPEN] Up Down Subsequence P 10 4 9
lg8192   [USACO22FEB] Paint by Rectangles P 56 6 9
lg8193   [USACO22FEB] Sleeping in Class P 158 7 9
lg8194   [USACO22FEB] Phone Numbers P 44 4 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
lg7984   [USACO21DEC] Tickets P 4 3 10
lg7985   [USACO21DEC] Paired Up P 4 3 10
lg7986   [USACO21DEC] HILO P 4 2 10
lg7530   [USACO21OPEN] United Cows of Farmer John P 77 10 8
lg7531   [USACO21OPEN] Routing Schemes P 23 4 8
lg7532   [USACO21OPEN] Balanced Subsets P 46 8 8
lg7416   [USACO21FEB] No Time to Dry P 28 8 7
lg7417   [USACO21FEB] Minimizing Edges P 19 4 9
lg7418   [USACO21FEB] Counting Graphs P 12 3 9
lg7293   [USACO21JAN] Sum of Distances P 29 5 8
lg7294   [USACO21JAN] Minimum Cost Paths P 62 4 9
lg7295   [USACO21JAN] Paint by Letters P 12 2 10
lg7154   [USACO20DEC] Sleeping Cows P 40 9 7
lg7155   [USACO20DEC] Spaceship P 29 4 9
lg7156   [USACO20DEC] Cowmistry P 24 4 9
lg6275   [USACO20OPEN] Sprinklers 2: Return of the Alfalfa P 24 10 6
lg6276   [USACO20OPEN] Exercise P 21 6 8
lg6277   [USACO20OPEN] Circus P 21 6 8
lg6142   [USACO20FEB] Delegation P 32 10 7
lg6143   [USACO20FEB] Equilateral Triangles P 33 9 7
lg6144   [USACO20FEB] Help Yourself P 46 8 8
lg6008   [USACO20JAN] Cave Paintings P 30 10 6
lg6009   [USACO20JAN] Non-Decreasing Subsequences P 35 8 7
lg6010   [USACO20JAN] Falling Portals P 59 8 8
lg5851   [USACO19DEC] Greedy Pie Eaters P 2 2 10
lg5852   [USACO19DEC] Bessie's Snow Cow P 1 1 10
lg5853   [USACO19DEC] Tree Depth P 2 2 10
lg5422   [USACO19OPEN] Compound Escape P 1 1 10
lg5423   [USACO19OPEN] Valleys P 1 1 10
lg5242   [USACO19FEB] Cow Dating P 5 2 10
lg5243   [USACO19FEB] Moorio Kart P 6 2 10
lg5244   [USACO19FEB] Mowing Mischief P 1 1 10
lg5202   [USACO19JAN] Redistricting P 1 1 10
lg5203   [USACO19JAN] Exercise Route P 13 6 8
lg5204   [USACO19JAN] Train Tracking 2 P 3 2 10
lg5155   [USACO18DEC] Balance Beam P 1 1 10
lg5156   [USACO18DEC] Sort It Out P 7 3 10
lg5157   [USACO18DEC] The Cow Gathering P 1 1 10
lg4372   [USACO18OPEN] Out of Sorts P 1 1 10
lg4373   [USACO18OPEN] Train Tracking P 1 1 10
lg4374   [USACO18OPEN] Disruption P 1 1 10
lg4088   [USACO18FEB] Slingshot P 1 1 10
lg4271   D59 树的直径 树上前缀和[USACO18FEB] New Barns P 3 1 10
lg4270   [USACO18FEB] Cow Gymnasts P 1 1 10
lg4182   [USACO18JAN] Lifeguards P 4 3 10
lg4183   [USACO18JAN] Cow at Large P 1 1 10
lg4184   [USACO18JAN] Sprinklers P 1 1 10
lg4081   [USACO17DEC] Standing Out from the Herd P 9 2 10
lg4082   [USACO17DEC] Push a Box P 1 1 10
lg4090   A38 贪心算法 [USACO17DEC] Greedy Gift Takers P 132 29 7
lg3664   [USACO17OPEN] Modern Art P 1 1 10
lg3665   [USACO17OPEN] Switch Grass P 3 2 10
lg3666   [USACO17OPEN] COWBASIC P 1 1 10
lg3656   *【树状数组】最少交叉[USACO17FEB] Why Did the Cow Cross the Road I P 11 1 10
lg3657   [USACO17FEB] Why Did the Cow Cross the Road II P 2 1 10
lg3658   [USACO17FEB] Why Did the Cow Cross the Road III P 1 1 10
lg3605   C87【树状数组+DFS】统计子树i中点权比wi大的点数[USACO17JAN] Promotion Counting P 58 24 5
lg3606   [USACO17JAN] Building a Tall Barn P 1 1 10
lg3607   [USACO17JAN] Subsequence Reversal P. 1 1 10
lg1715   [USACO16DEC] Lots of Triangles P 1 1 10
lg2098   [USACO16DEC] Team Building P 1 1 10
lg2541   [USACO16DEC] Robotic Cow Herd P 1 1 10
lg3147   [USACO16OPEN] 262144 P 12 9 8
lg3148   [USACO16OPEN] Bull in a China Shop P 1 1 10
lg2748   [USACO16OPEN] Landscaping P 1 1 10
lg6172   [USACO16FEB] Load Balancing P 2 1 10
lg3141   D138 [USACO16FEB] Fenced In P 12 1 10
lg6173   [USACO16FEB] Circular Barn P 6 1 10
lg3135   【动态规划：区间一维一边推】最大子矩阵2️⃣[USACO16JAN] Fort Moo P 16 10 7
lg3136   [USACO16JAN] Mowing the Field P 3 1 10
lg6176   [USACO16JAN] Lights Out P 3 1 10
lg3128   A11*【树上点差分】树上路径修改和点查询1[USACO15DEC] Max Flow P 29 19 3
lg3129   *【模拟+set】[USACO15DEC] High Card Low Card P 7 4 10
lg3130   C02*【线段树】一维区间修改+区间询问[USACO15DEC] Counting Haybale P 278 40 8
 
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