
PrincessTwilightwenttoCelestiaandLuna'soldcastletoresearchthechestfromtheElementsofHarmony.Asequenceofpositiveintegers bi isharmonyifandonlyifforeverytwoelementsofthesequencetheirgreatestcommondivisorequals1.Accordingtoanancientbook,thekeyofthechestisaharmonysequence bi whichminimizesthefollowingexpression:Youaregivensequence ai,helpPrincessTwilighttofindthekey.InputThefirstlinec...
![「BZOJ2101」[Usaco2010 Dec] Treasure Chest 藏宝箱](http://hzwer.com/wp-content/themes/ly/image/image_post/F18B283D-78F3-453D-A196-15532E644324.png)
DescriptionBessieandBonniehavefoundatreasurechestfullofmarvelousgoldcoins!Beingcows,though,theycan'tjustwalkintoastoreandbuystuff,soinsteadtheydecidetohavesomefunwiththecoins.TheN(1<=N<=5,000)coins,eachwithsomevalueC_i(1<=C_i<=5,000)areplacedinastraightline.BessieandBonnietaketurns,andforeachcow'sturn,shetakesexactlyonecoinoffofeithertheleftendortherightendoftheline.Thegame...
![「BZOJ1672」[Usaco2005 Dec] Cleaning Shifts 清理牛棚](http://hzwer.com/wp-content/themes/ly/image/image_post/2014-12-10_12-58-48.jpg)
DescriptionFarmerJohn'scows,pamperedsincebirth,havereachednewheightsoffastidiousness.Theynowrequiretheirbarntobeimmaculate.FarmerJohn,themostobligingoffarmers,hasnochoicebuthiresomeofthecowstocleanthebarn.FarmerJohnhasN(1<=N<=10,000)cowswhoarewillingtodosomecleaning.Becausedustfallscontinuously,thecowsrequirethatthefarmbecontinuouslycleanedduringtheworkday,whichrunsfromsecondnumbe...
![「BZOJ1664」[Usaco2006 Open] County Fair Events 参加节日庆祝](http://hzwer.com/wp-content/themes/ly/image/image_post/2014-12-05_10-02-53.jpg)
DescriptionFarmerJohnhasreturnedtotheCountyFairsohecanattendthespecialevents(concerts,rodeos,cookingshows,etc.).HewantstoattendasmanyoftheN(1<=N<=10,000)specialeventsashepossiblycan.He'srentedabicyclesohecanspeedfromoneeventtothenextinabsolutelynotimeatall(0timeunitstogofromoneeventtothenext!).GivenalistoftheeventsthatFJmightwishtoattend,withtheirstarttimes(1<=T<=100,000)a...

Youhave k piecesoflaundry,eachofwhichyouwanttowash,dryandfold.Youareatalaundromatthathas n1 washingmachines,n2 dryingmachinesand n3 foldingmachines.Eachmachinecanprocessonlyonepieceoflaundryatatime.Youcan'tdryapieceoflaundrybeforeitiswashed,andyoucan'tfolditbeforeitisdried.Moreover,afterapieceoflaundryiswashed,itneedstobeimmediatelymovedintoadryingmachine,andafteritisdried,itneedstobei...
![「BZOJ1649」[Usaco2006 Dec] Cow Roller Coaster](http://hzwer.com/wp-content/themes/ly/image/image_post/2014-12-10_12-37-19.jpg)
DescriptionThecowsarebuildingarollercoaster!Theywantyourhelptodesignasfunarollercoasteraspossible,whilekeepingtothebudget.TherollercoasterwillbebuiltonalonglinearstretchoflandoflengthL(1<=L<=1,000).TherollercoastercomprisesacollectionofsomeoftheN(1<=N<=10,000)differentinterchangablecomponents.EachcomponentihasafixedlengthWi(1<=Wi<=L).Duetovaryingterrain,eachcomponen...
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