USACO Contest

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USA Computing Olympiad Monthly Competition

2012-2013

US Open 2013

• Bronze
  • Bovine Ballet(ballet)(题解)
  • Blink(blink)(题解)
  • Photo(photo)(题解)
  • Haywire(haywire)(题解)
• Silver
  • What's Up With Gravity(gravity)(题解)
  • Fuel Economy(fuel)(题解)
  • Luxury River Cruise(cruise)(题解)
• Gold
  • Photo(photo)(题解)
  • Yin and Yang(yinyang)(题解)
  • Figure Eight(eight)(题解)

March

• Gold
  • The Cow Run(cowrun)(题解)
  • Hill Walk(hillwalk)(题解)
  • Necklace(necklace)(题解)
• Silver
  • Poker Hands(poker)(题解)
  • Farm Painting(painting)(题解)
  • The Cow Run(cowrun)(题解)
• Bronze
  • Cow Race(cowrace)(题解)
  • Breed Proximity(proximity)(题解)
  • Breed Assignment(assign)(题解)

2011-2012

US Open 2012

• Bronze
  • Cows in a Row(cowrow)(题解)
  • Three Lines(3lines)(题解)
  • Islands(islands)(题解)
  • Unlocking Blocks(unlock)(题解)
• Silver
  • Unlocking Blocks(Silver)(unlock)(题解)
  • Bookshelf(Silver)(bookshelf)(题解)
  • Running Laps(running)(题解)
• Gold
  • Tied Down(tied)(题解)
  • Bookshelf(bookshelf)(题解)
  • Balanced Cow Subsets(subsets)(题解)

March

• Bronze
  • Times 17(times17)(题解)
  • Connect the Cows(connect)(题解)
  • Wrong Directions(wrongdir)(题解)
• Silver
  • Tractor(tractor)(题解)
  • Flowerpot(fpot)(题解)
  • Landscaping(landscape)(题解)
• Gold
  • Large Banner(banner)(题解)
  • Haybale Restacking(restack)(题解)
  • Cows in a Skyscraper(skyscraper)(题解)

February

• Bronze
  • Rope Folding(folding)(题解)
  • Overplanting (Bronze)(planting_bronze)(题解)
  • Moo(moo)(题解)
• Silver
  • Overplanting (Silver)(planting_silver)(题解)
  • Cow IDs(cowids)(题解)
  • Relocation(relocate)(题解)
• Gold
  • Cow Coupons(coupons)(题解)
  • Symmetry(symmetry)(题解)
  • Nearby Cows(skyscraper)(题解)

January

• Bronze
  • Gifts(gifts)(题解)
  • Haybale Stacking(stacking)(题解)
  • Grazing Patterns(grazing)(题解)
• Silver
  • Delivery Route(delivery)(题解)
  • Bale Share(baleshare)(题解)
  • Mountain Climbing(climb)(题解)
• Gold
  • Video Game(combos)(题解)
  • Cow Run(cowrun)(题解)
  • Bovine Alliance(alliance)(题解)

2010-2011

US Open 2010

• Bronze
  • 牛友(cowpals)(题解)
  • 山峰暸望(mount)(题解)
  • 接力赛跑(relayrace)(题解)
  • 奶牛打字(typing)(题解)
• Silver
  • Cows in Trees(cowtree)(题解)
  • 山峰暸望(smount)(题解)
  • 时间旅行(ttravel)(题解)
• Gold
  • 奶牛的跳格子游戏(hop)(题解)
  • 冲浪(slide)(题解)
  • 数三角形(tricount)(题解)

March

• Bronze
  • Need For Speed(boost)(题解)
  • Hexadecimal Conversion(hex)(题解)
  • MasterMind(mmind)(题解)
  • Longest Contiguous Subsequence(sub)(题解)
• Silver
  • 石头木头(rocks)(题解)
  • Test Taking(teststr)(题解)
  • Need For Speed(sboost)(题解)
• Gold
  • 奶牛大集会(gather)(题解)
  • 农场分配(balloc)(题解)
  • 星际争霸(starc)(题解)

February

• Bronze
  • Scavenger Hunt(scavhunt)(题解)
  • Feeding Time(feedtime)(题解)
  • Toy Shopping(toyshop)(题解)
• Silver
  • 买巧克力(cbuying)(题解)
  • 送巧克力(cgiving)(题解)
  • 吃巧克力(ceating)(题解)
• Gold
  • 覆盖牛棚(corral)(题解)
  • 冰上(ice)(题解)
  • 慢慢走(slowdown)(题解)

January

• Bronze
  • DNA Sequencing(dna)(题解)
  • Theater Seating(tseat)(题解)
  • Word Morph(wmorph)(题解)
• Silver
  • 茶会(ttime)(题解)
  • 购买饲料II(feed2)(题解)
  • 起司塔(cheese)(题解)
• Gold
  • Taking Turns(hayturn)(题解)
  • Shipping Around an Island(island)(题解)
  • 奶牛电话(telephone)(题解)

Holiday 2010 Bonus Competition

• Gold
  • 奶牛政坛(cowpol)(题解)
  • 石头木头(rocks)(题解)
  • 驱逐猪猡(dotp)(题解)
  • 奶牛战争(cowwar)(题解)

2009-2010

December

• Gold
  • 头晕的奶牛(dizzy)(题解)
  • 过路费(toll)(题解)
  • 电视游戏问题(vidgame)(题解)

• Silver
  • Bobsledding(bobsled)(题解)
  • Music Notes(mnotes)(题解)
  • Self Grazing(sgraze)(题解)

October(Qualification)

• Gold
  • 奇数还是偶数(evenodd)(题解)
  • 犁田机器人(rplow)(题解)
  • 牛棚回声(echo)(题解)
  • 木瓜林(papaya)(题解)
  • 悠闲漫步(stroll)(题解)
  • 乳草的入侵(milkweed)(题解)
  • 零用钱(allow)(题解)
  • Bessie的体重问题(diet)(题解)
  • 热浪(heatwv)(题解)

April

• Bronze
  • Time Cards(timecards)(题解)
  • O Those Fads(fads)(题解)
  • Good Grass(goodgrs)(题解)

March

• Bronze
  • 池塘管道(plumb)(题解)
  • Pay Back(Uing)(题解)

Febrary

• Silver
  • Cruel Math Teacher, I(cruel1)(题解)
  • Cruel Math Teacher, II (cruel2)(题解)
  • 公牛和奶牛(bullcow)(题解)

2008-2009

December

• Bronze
  • Checkers(chkr)(题解)
  • Bad Grass(badgras)(题解)
  • Hay Expenses(hayexp)(题解)

November

• Gold
  • Mixed Up Cows(mixup2)(题解)
  • Cheering up the Cows(cheer)(题解)
  • Light Switching(lites)(题解)
  • Toys(toy)(题解)

October(Qualification)

• Gold
  • Bovine Bones(bones)(题解)
  • Building A Fence(quad)(题解)
  • Watering Hole(water)(题解)
  • Pasture Walking(pwalk)(题解)
  • Wheel Rotation(rotation)(题解)
  • Power Failure(pwrfail)(题解)

2007-2008

February

• Gold
  • Making the Grade(grading)(题解)
  • Cow Game(cgame)(题解)
  • Hotel(hotel)(题解)
• Silver
  • Game of Lines(lines)(题解)
  • Meteor Shower(meteor)(题解)
  • Eating Together(egroup)(题解)
• Bronze
  • Dining Cows(diningb)(题解)
  • Long Distance Racing(racing)(题解)
  • Cow Multiplication(cowmult)(题解)

January

• Gold
  • Haybale Guessing(bales)(题解)
  • Artificial Lake(alake)(题解)
  • Cell Phone Network(tower)(题解)
• Silver
  • Cow Contest(contest)(题解)
  • Running(cowrun)(题解)
  • Telephone Lines(phoneline)(题解)
• Bronze
  • Costume Party(costume)(题解)
  • Election Time(elect)(题解)
  • iCow(icow)(题解)

November

• Gold
  • Telephone Wire(telewire)
  • Cow Relays(relays)
  • Sunscreen(tanning)
• Silver
  • Cow Hurdles(hurdles)
  • Milking Time(milkprod)
  • Best Cow Line(bcl)
• Bronze
  • Exploration(explore)
  • Speed Reading(read)
  • Avoid The Lakes(lake)

December

• Gold
  • Sightseeing Cows(sightsee)
  • Gourmet Grazers(gourmet)
  • Best Cow Line(bclgold)
• Silver
  • Charm Bracelet(charm)
  • Building Roads(roads)
  • Mud Puddles(mud)
• Bronze
  • Bookshelf(shelf)
  • Bookshelf 2(shelf2)
  • Card Stacking(cheat)

Special 2007 Chinese Competition

• Gold
  • Summing Sums(sumsums)
  • The Bovine Accordion and Banjo Orchestra(baabo)
  • Treasure(treasure)

2006-2007

April(Open)

• Gold
  • Cheapest Palindrome(cheappal)
  • Dining(dining)
  • Connect(connect)
• Silver
  • City Horizon(horizon)
  • Catch That Cow(catchcow)
  • Fliptile(fliptile)
• Bronze
  • Cow Solitaire(solitair)
  • The Flower Garden(flowers)
  • Cow Counting(count)
  • Bronze Cow Party(bparty)

March

• Gold
  • Gold Balanced Lineup(lineup)
  • Ranking the Cows(ranking)
  • Face The Right Way(cowturn)
• Silver
  • Cow Traffic(traffic)
  • Balanced lineup(balance)
  • Monthly Expense(expense)
• Bronze
  • Fireworks Show(fireshow)
  • Bovine Latin(latin)
  • Cows Of The Round Table(round)

February

• Gold
  • Building A New Barn(newbarn)
  • Cow Sorting(csort)(题解)
  • Lilypad Pond(lilypad)
• Silver
  • The Cow Lexicon(lexicon)
  • Silver Lilypad Pond(silvlily)
  • Silver Cow Party(sparty)
• Bronze
  • Cow Yahtzee(cowyotz)
  • Bronze Lilypad Pond(bronlily)
  • Buy One Get One Free(buyfree)

January

• Gold
  • Balanced Lineup(lineupg)
  • Problem Solving(psolve)
  • Cow School(schul)
• Silver
  • Protecting the Flowers(flowers)
  • Tallest Cow(tallest)
  • Balanced Lineup(lineup)
• Bronze
  • Qualified Primes(qprime)
  • Making Change(change)
  • The Bale Tower(btwr)

December

• Gold
  • Wormholes(wormhole)
  • The Fewest Coins(fewcoins)
  • Milk Patterns(patterns)
• Silver
  • Cow Picnic(picnic)
  • Cow Roller Coaster(coaster)
  • River Hopscotch(jump)
• Bronze
  • Wonderprime Brands(wpb)
  • The Eating Puzzle(eatpuz)
  • Dream Counting(dream)

November

• Gold
  • Fence Repair(plank)(题解)
  • Corn Fields(cowfood)(题解)
  • Roadblocks(block)(题解)
• Silver
  • Bad Hair Day(badhair)(题解)
  • Big Square(bigsq)(题解)
  • Round Numbers(rndnum)(题解)
• Bronze
  • New Cow Brands(brand3)(题解)
  • Word Games(scrbl)(题解)
  • Serious Cow Tag(cowtag)(题解)

October(Qualification)

• Gold
  • Another Cow Number Game(acng)(题解)
  • Guess My Number(guess)(题解)
  • Cows on Skates(skate)(题解)
  • Cow Pie Treasures(pie1)(题解)
  • Hungry Cows(lineup)(题解)
  • Building the Moat(moat)(题解)

2005-2006

April(Open)

• Gold
  • The County Fair(cfair)
  • The Milk Queue(mqueue)
  • Two-Headed Cows(twohead)
• Silver
  • The County Fair(counfr)
  • County Fair Events(events)
  • The Climbing Wall(wall)
• Bronze
  • Bedtime Reading, I(br1)
  • Eenie Meenie Miney Moe(eenie)
  • Cow Pizza(pizza)
  • Bedtime Reading, II(br2)
  • Cows on a Leash(leash)

March

• Gold
  • Ski Lift(skilift)
  • Milk Team Select(tselect)
  • Mooo(mooo)
• Silver
  • Mooo(moooo)
  • Water Slides(slides)
  • Lights Out(xlite)
• Bronze
  • Evening Stroll(stroll)
  • RADAR Brands(radar)
  • Magic Cow Shoe(mcs)

Feberary

• Gold
  • Treats for the Cows(trt)
  • Backward Digit Sums(bdsum)
  • Cellphones(cell)
  • Steady Cow Assignment(stead)
• Silver
  • Stall Reservations(reserve)
  • Treats for the Cows(treat)
  • Backward Digit Sums(bdsum)
• Bronze
  • The Moronic Cowmpouter(neg2)
  • DNA Assembly(dna)
  • Cow Phrasebook(phrase)

January

• Gold
  • Redundant Paths(rpaths)
  • Roping the Field(roping)
  • Corral the Cows(corral)
• Silver
  • The Cow Prom(prom)
  • Dollar Dayz(ddayz)
  • The Grove(grove)
• Bronze
  • Stump Removal(stumps)
  • Finicky Grazers(graze1)
  • The Water Bowls(bowls)

November

• Gold
  • Asteroids(asteroid)
  • Grazing on the Run(ontherun)
  • Walk the Talk(twalk)
• Silver
  • City skyline(skyline)
  • Cow Acrobats(acrobat)
  • Ant Counting(ants)
• Bronze
  • Securing the Barn(passwd)
  • Hopscotch(numgrid)
  • Satellite Photographs(satpix)

October

• Gold
  • Skiing(cowski)
  • Flying Right(flight)
• Silver
  • Close Encounter(nearfr)
  • Allowance(allow)
• Bronze
  • Bovine Birthday(bday)
  • Max Factor(bigfact)

2004-2005

April(Open)

• Gold
  • Lazy Cows(lazy)
  • Expedition(exp)
  • Around the world(around)
  • Landscaping(peaks)

• Silver
  • Waves(waves)
  • Navigating the City(navcit)
  • Disease Manangement(disease)
  • Muddy roads(mud)

• Bronze
  • Countable Numbers(cnums)
  • Long Division(ldiv)
  • Boggled Cows(boggle)
  • Acrophobic cows(accow)

March

• Gold
  • Ombrophobic Bovines(ombro)
  • Space Elevator(elevator)
  • Yogurt factory(yogfac)

• Silver
  • Yogurt factory(yogurt)
  • Checking an Alibi(alibi)
  • Out of Hay(outofhay)

• Bronze
  • DNA strings(dna)
  • Palindromes(pal)
  • Negative Powers of Two(nptwo)

February

• Gold
  • Jersey Politics(jpol)
  • Secret Milking Machine(secret)
  • Aggressive cows(aggr)

• Silver
  • Part Acquisition(acquire)
  • Rigging the Bovine Election(cowrig)
  • Feed Accounting(fcount)

• Bronze
  • Powers of Two(ptwo)
  • Cow Similarity(likecow)
  • Linear Sequences(lseq)
  • No Linear Sequences(nls)

January

• Gold
  • Muddy Fields(cover)
  • The Wedding Juicer(juice)
  • Naptime(naptime)

• Silver
  • Sumsets(sumset)
  • Watchcow(watchcow)
  • Moo Volume(volume)

• Bronze
  • Binary Numbers(binnum)
  • Bank Balance(bankbal)
  • Satellite Photo(satel)
  • Plate Stacking(plates)

December

• Gold
• the Path(divide)
  • Fence Obstacle Course(obstacle)
  • Cow Ski Area(skiarea)

• Silver
  • Cleaning Shifts(cleaning)
  • Bad Cowtractors(cowtract)
  • Tree Cutting(treecut)

• Bronze
  • Long Multiplication(mpy)
  • Crossword Puzzles(xword)
  • Physics Phlunkie(scino)
  • Money(money)

November(Qualification)

• Gold
  • Apple Catching(bcatch)
  • Lake Counting(lkcount)
  • Til the Cows Come Home(cowhome)
  • Who's in the Middle(middle)
  • Bull Math(bullmath)
  • Bank Interest(bankint)

2003-2004

April(Open)

• Green
  • Cube Stacking(cubes)
  • The Cow Lineup(lineup)
  • MooFest(moofest)
  • Turning in Homework(turnin)

• Orange
  • Cave Cows 1(cavecow1)
  • Cave Cows 2(cavecow2)
  • Cave Cows 3(cavecow3)
  • Cave Cows 4(cavecow4)

• Blue
  • Barrels of Feed(barrels)
  • Elimination Game(elimgame)
  • Fence Enclosures(enclosures)
  • Line Up the Cows(line)

March

• Green
  • Moo University - Team Tryouts(tryout)
  • Moo University - Emergency Pizza Order(pizza)
  • Moo University -- Financial Aid(finance)

• Orange
  • Lying Livestock(liecow)
  • Special Serial Numbers(serial)
  • Paranoid Cows(paranoid)

February

• Green
  • Navigation Nightmare(navigate)
  • Cow Marathon(marathon)
  • Distance Queries(dquery)
  • Distance Statistics(dstats)

• Orange
  • Breeding(breeding)
  • The Big Game(thegame)
  • Farmer John's View(fjview)
  • Pesky Parentheses(parens)

• Blue
  • Cow Word Games(wordgame)
  • Bovine Ballroom Dancing(ballroom)
  • Automatic Fence Gate(gate)
  • The Middle Squares(midsq)

December

• Green
  • Rain Cover(cover)
  • Elite Eating(elite)
  • Spring Vacation(sprbrk)
  • Cow Queueing(cowq)

November

• Green
  • Cow Exhibition(smrtfun)
  • Milking Grid(mgrid)
  • Popular Cows(popular)
  • Beauty Contest(msworld)

2002-2003

April(Open)

• Green
  • Cowpals(cowpal)
  • Mountain Walking(mtwalk)
  • Millenium Leapcow(leap2)
  • Optimal Milking(milking)
• Orange
  • Bale Figures(bales2)
  • Jumping Cows Harry Wiggins(jumpcow)
  • Lost Cows(lost)
  • Bovine Math Geniuses(icecrm)

March

• Green
  • TwoFour(twofour)
  • Best Cow Fences(cowfnc)
  • Cornfields(cornfld)

• Orange
  • Six Degrees of Cowvin Bacon(bacon)
  • Herd Sums(hsums)
  • Message Decowding(decode)

February

• Green
  • Cow Math(cowmath)
  • Cow Imposters(impster)
  • Traffic Lights(traffic)
  • Farm Tour(tour)

• Orange
  • Vertical Histogram(vhist)
  • Number Triangles(numtri)
  • Cowties(cowties)
  • Travel Games(travgm)

December

• Orange
  • The Collatz Code(collatz)
  • Cow Fibonacci Numbers(cowfib)
  • Shopping Spree(shop)

April(Open)

• Green
  • Mountain Majesties(majesty)
  • Secret Milk Pipes(secret)
  • Circus Tickets(tix)
  • Life Cycle(life)

• Orange
  • Wiggle Numbers(wiggle)
  • Life Cycle(life2)
  • Superwords(suword)
  • Cow Words(words)
  • Cow Brainiacs(brain)

March

• Green
  • Hypnotic Milk Improvement(hypno)
  • Happy Cows(happy)
  • Unary Cow Counting(ucc)

• Orange
  • Dairy Route(route)
  • Calf Numbers(calfnum)
  • Hide and Seek(hdseek)

February

• Green
  • Fiber Communications(fiber)(题解)
  • Power Hungry Cows(power)(题解)
  • Cow Cycling(cycling)
  • Rebuilding Roads(roads)
  • Triangular Pastures(pasture)

• Orange
  • Chores(chores)
  • Dessert(dessert)
  • Extra Krunch(krunch)
  • BUY LOW, BUY LOWER(buylow)

January(Winter)

• Green
  • Pasture Fences(pasture)
  • New Years Party(party)
  • Strolling Cows(stroll)
  • Grazing Sets(grazeset)

• Orange
  • Factorial Power(fact)
  • Friday the Thirteenth(friday)
  • Beef McNuggets(nuggets)
  • Calf Flac(calfflac)

November(Fall)

• Green
  • Cow Dominoes(cowdom)
  • Cow Plumbing(plumb)
  • Dinner Time(dinner)
  • Cowese(prefix)

• Orange
  • power^{[需要证实]}(power)
  • Dictionary Numbers(dictnum)
  • Hungry Cows(hunger)
  • Cow Shuffle(shuffle)
  • Negative Powers(neg)

2001-2002

April(Open)

• Green
  • Cow Relays(relay)
  • Earthquake(quake)
  • Cow Sorting(sort)
  • Cow Signs(sign)
  • Trapped in the Well(well)

外部链接

• http://infoman.musala.com/usaco/main.html，部分英文题目。
• USACO官方网站，可以找到部分旧的题目。
• USACO Contest官方网站
• USACO每次竞赛的成绩及数据、题解会发布在ace.delos.com，USACO不会在网页上公布过去的竞赛的具体地址，但是命名是有规律的，例如2004年2月的竞赛相关内容就在http://ace.delos.com/FEB04