DescriptionGordistrainingforamarathon.Behindhishouseisaparkwithalargenetworkofjoggingtrailsconnectingwaterstations.Gordwantstofindtheshortestjoggingroutethattravelsalongeverytrailatleastonce.InputInputconsistsofseveraltestcases.Thefirstlineofinputforeachcasecontainstwopositiveintegers:n<=15,thenumberofwaterstations,andm<1000,thenumberoftrails.Foreachtrail,thereisonesubsequentlineofin...
Afterthesuccessof2ndanniversary(takealookatproblemFTOURformoredetails),this3rdyear,TravelAgentSPOJgoesonwithanotherdiscounttour.ThetourwillbeheldonICPCisland,amiraculousoneonthePacificOcean.WelistNplaces(indexedfrom1toN)wherethevisitorscanhaveatrip.Eachroadconnectingthemhasaninterestvalue,andthisvaluecanbenegative(ifthereisnothinginterestingtoviewthere).Simply,theseNplaces...
假定n<m\[\sum_{isprime(p)}\sum_{a=1}^n\sum_{b=1}^mgcd(a,b)==p\]\[\sum_{isprime(p)}\sum_{a=1}^{\left\lfloor\frac{n}{p}\right\rfloor}\sum_{b=1}^{\left\lfloor\frac{m}{p}\right\rfloor}gcd(a,b)==1\]\[\sum_{isprime(p)}\sum_{a=1}^{\left\lfloor\frac{n}{p}\right\rfloor}\sum_{b=1}^{\left\lfloor\frac{m}{p}\right\rfloor}\sum_{d|a\&d|b}\mu(d)\]\[\sum_{isprime(p)}\sum_{d=1}^{\left\lfloor\frac{n}{p}\right...
Celebratingthenewyear,manypeoplepostvideosoffallingdominoes;Here'salistofthem:https://www.youtube.com/results?search_query=New+Years+DominosUserainta,wholivesina2Dworld,isgoingtopostavideoaswell.Therearendominoesona2DCartesianplane.i-thdomino(1 ≤ i ≤ n)canberepresentedasalinesegmentwhichisparalleltothey-axisandwhoselengthisli.Thelowerpointofthedominoisonthex-axis.Let'sdenotethex-...
Useraintahasapermutationp1, p2, ..., pn.AstheNewYeariscoming,hewantstomakehispermutationasprettyaspossible.Permutationa1, a2, ..., anisprettierthanpermutationb1, b2, ..., bn,ifandonlyifthereexistsanintegerk(1 ≤ k ≤ n)wherea1 = b1, a2 = b2, ..., ak - 1 = bk - 1andak < bkallholds.Asknown,permutationpissosensitivethatitcouldbeonlymodifiedbyswappingtwodistinctele...
1.首先安装mactex http://blog.csdn.net/wdkirchhoff/article/details/41704027,俩个多G,下个迅雷formac慢慢载吧2.下个auctex的安装包 http://www.gnu.org/software/auctex/然后用终端进入其解压后的文件夹运行[crayon-67b98a0b43e26689982818/]运行[crayon-67b98a0b43e2e776295367/]将以下内容加入.emacs[crayon-67b98a0b43e31437531472/]然后就完成了。。。噢对了要说下中文的问题建议进入TeXShop->Preferences->...
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