
KitaharaHarukihasbought n applesforToumaKazusaandOgisoSetsuna.Nowhewantstodividealltheapplesbetweenthefriends.Eachappleweights100gramsor200grams.OfcourseKitaharaHarukidoesn'twanttooffendanyofhisfriend.ThereforethetotalweightoftheapplesgiventoToumaKazusamustbeequaltothetotalweightoftheapplesgiventoOgisoSetsuna.ButunfortunatelyKitaharaHarukidoesn'thaveakniferightnow,sohecannotsp...

KuriyamaMiraihaskilledmanymonstersandgotmany(namely n)stones.Shenumbersthestonesfrom 1 to n.Thecostofthe i-thstoneis vi.KuriyamaMiraiwantstoknowsomethingaboutthesestonessoshewillaskyoutwokindsofquestions:Shewilltellyoutwonumbers, l and r (1 ≤ l ≤ r ≤ n),andyoushouldtellher .Let ui bethecostofthe i-thcheapeststone(thecostthatwillbeonthe i-thplaceifwearrangealltheston...
![「BZOJ1629」[Usaco2007 Demo] Cow Acrobats](http://hzwer.com/wp-content/themes/ly/image/image_post/2014-12-10_12-26-49.jpg)
DescriptionFarmerJohn'sN(1<=N<=50,000)cows(numbered1..N)areplanningtorunawayandjointhecircus.Theirhoofedfeetpreventthemfromtightropewalkingandswingingfromthetrapeze(andtheirlastattemptatfiringacowoutofacannonmetwithadismalfailure).Thus,theyhavedecidedtopracticeperformingacrobaticstunts.Thecowsaren'tterriblycreativeandhaveonlycomeupwithoneacrobaticstunt:standingontopofeachothertoform...

Manystudentsliveinadormitory.Adormitoryisawholenewworldoffunnyamusementsandpossibilitiesbutitdoeshaveitsdrawbacks.Thereisonlyoneshowerandtherearemultiplestudentswhowishtohaveashowerinthemorning.That'swhyeverymorningthereisalineoffivepeopleinfrontofthedormitoryshowerdoor.Assoonastheshoweropens,thefirstpersonfromthelineenterstheshower.Afterawhilethefirstpersonleavestheshowerandthenextpersonent...

Quiterecently,averysmartstudentnamedJurydecidedthatlecturesareboring,sohedownloadedagamecalled"BlackSquare"onhissupercooltouchscreenphone.Inthisgame,thephone'sscreenisdividedintofourverticalstrips.Eachsecond,ablacksquareappearsonsomeofthestrips.Accordingtotherulesofthegame,Jurymustusethissecondtotouchthecorrespondingstriptomakethesquaregoaway.AsJuryisbothsmartandlazy,hecountedthathewaste...

Youhaveanarray a[1], a[2], ..., a[n],containingdistinctintegersfrom 1 to n.Yourtaskistosortthisarrayinincreasingorderwiththefollowingoperation(youmayneedtoapplyitmultipletimes):choosetwoindexes, i and j (1 ≤ i < j ≤ n; (j - i + 1) isaprimenumber);swaptheelementsonpositions i and j;inotherwords,youareallowedtoapplythefollowingsequenceofassignments: tmp = a[i], a...
![「BZOJ1755」[Usaco2005 qua] Bank Interest](http://hzwer.com/wp-content/themes/ly/image/image_post/8C273BCA-E7E5-49EB-AF51-EB60001677B1.png)
DescriptionFarmerJohnmadeaprofitlastyear!Hewouldliketoinvestitwellbutwondershowmuchmoneyhewillmake.HeknowstheinterestrateR(anintegerbetween0and20)thatiscompoundedannuallyathisbank.HehasanintegeramountofmoneyMintherange100..1,000,000.HeknowshowmanyyearsY(range:0..400)heintendstoinvestthemoneyinthebank.Helphimlearnhowmuchmoneyhewillhaveinthefuturebycompoundingtheinterestforeachyearhesaves...
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