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「CF538X」Codeforces Round #300
A.CuttingBanner枚举切掉中间部分匹配[crayon-68037f741cbfe374914640/]B.QuasiBinary用最少的只包含01的数凑出n每次贪心在非0位上取1[crayon-68037f741cc07950715238/]C.Tourist'sNotes根据每俩个的时间及高度差可计算答案[crayon-68037f741cc0c899099571/]D.WeirdChess暴力暴力暴力[crayon-68037f741cc11781839981/]E.DemiurgesPlayAgain考虑进入某个根，最终会取得子树第几小的叶子[crayon-68037f741cc17272514...
「codechef」April Challenge 2015
BROKPHON模拟[crayon-68037f741d1ea328600254/]CHEFLCM所有约数和[crayon-68037f741d1f3901786956/]PIANO1暴力TT[crayon-68037f741d1f7517618304/]CSEQl~r之间每个数的使用次数当作一个变量。。那么就相当于求方程组sigma(xi)(l<=i<=r)=n的非负整数解数。。然后就是排列组合求和[crayon-68037f741d1fc442004532/]CARLOS先用并查集将能够相互转化的并在一起dpf(i,j)表示前i个末尾为j的最小改...
「CF526X」ZeptoLab Code Rush 2015
懒得开多篇了，深夜口胡TAT现在是凌晨4点。。。A：KingofThieves枚举起始点模拟[crayon-68037f741db20125404413/]B：OmNomandDarkPark算出最大值，从最高层开始贪心，能加尽量加[crayon-68037f741db29184526869/]C：OmNomandCandies设hb/wb为小于ha/wa即a的单位质量价值高分类讨论若wb很大，则可以枚举b取了多少个否则a取的数量一定与c/wa相差不超过wb分类暴力TAT[crayon-68037f741db2e220604313/]D： OmNom...
「CF529E」The Art of Dealing with ATM
ATMsofawell-knownbankofasmallcountryarearrangedsothattheycannotgiveanyamountofmoneyrequestedbytheuser.Duetothelimitedsizeofthebilldispenser(thedevicethatisdirectlygivingmoneyfromanATM)andsomepeculiaritiesoftheATMstructure,youcangetatmostkbillsfromit,andthebillsmaybeofatmosttwodistinctdenominations.Forexample,ifacountryusesbillswithdenominations10,50,100,500,1000and5000burles,thenatk = ...
「codechef」March Challenge 2015
只做了前6题弃疗了感觉codechef写题解也没啥人看……「codechefCNOTE」ChefandNotebooks纯模拟[crayon-68037f743920a081659746/]「codechefSIGNWAVE」SignWave听说此题打表可以找规律。。引用zld神犇的话吧。。。就是若干个余弦函数的零点均不同。。然后sin函数的分布就十分奇怪了。。比如s=3的时候就是312131213，忽略两端的情况。。就变成非常规则的1213121然后我们再考虑余弦函数当c=2的时候分布就是011101110...
「topcoder」Kodifica – Pratice Round 1
打了场莫名其妙的比赛150Youneedtoupdatethebalanceinyourcheckbook.Youknowyourstartingbalance,thetotalamountspentusingyourdebitcard,andthetotalvalueofchecksthathavebeenwritten.Returnyourendingbalance.a-b-c。。。[crayon-68037f7439979491958298/]500Preparinganationalbudgetinvolvessumsoflargenumbers.Thesenumbersshouldbeformattedinaniceway.Yourtaskis,givensomenicelyformattedcosts(inUSdollarsandcen...
「topcoder」Single Round Match 652 – Round 1 Div2
topcoder怎么会把客户端做成这样差评第一场只能打div2TAT250Youaregivenastringsconsistingoflowercaseletters.Weassigntheletters'a'to'z'valuesof1to26,respectively.WewilldenotethevalueassignedtotheletterXbyval[X].Forexample,val['a']=1andval['e']=5.Wedefinethevalueofthestringsasfollows.Foreachletters[i],letk[i]bethenumberoflettersinsthatarelessthanorequaltos[i],includings[i]itself.Then,thevalu...
「codechef」January Lunchtime 2015
Pieceofcake 统计每个字母出现次数，取最大值，判断其是否等于l/2[crayon-68037f743a6ee539179486/]Justmultiply 乘法快速乘即可，但乘方由于M过大。。使用欧拉函数降幂比较麻烦。。发现a^(10b+c)=(a^b)^10*a^c然后就能On算出表达式了^10可以看做常数[crayon-68037f743a6f7553962119/]Candidatewalk状压一下，转移显然[crayon-68037f743a6fc416364139/]Manybananas这一题比较有意思将宗族大小分为<=300和>300用数组统...
「CF519X」Codeforces Round #294 (Div. 2)
「cf519A」AandBandChess模拟[crayon-68037f743abec458756343/]「cf519B」AandBandCompilationErrors排序，双指针对比用个hash/map统计下元素出现次数[crayon-68037f743abf7627812281/]「cf519C」AandBandTeamTraining实际上答案是min(n,m,(m+n)/3)我分类讨论了TAT还是很好yy的[crayon-68037f743abfc675764538/]「cf519D」AandBandInterestingSubstringsa[i][j]表示前缀和为i，字母j为末尾的前缀数量每次查询...
「codechef」February Lunchtime 2015
懒得开多篇了LuckyFour 这题在逗我么[crayon-68037f743b428597489682/]TheWarehouse发现实际上把一个东西移动到一个位置相当于不断做代价为1的交换所以只要枚举给3种字母赋权，求逆序对最小值即可[crayon-68037f743b431392781913/]Heavy-lightDecompositions设f[i][j]表示i为根的子树，后代到i经过轻边数量不超过j树形dp，要用到前缀后缀积/逆元。。。[crayon-68037f743b438912088862/] TheFirstCube 一眼分...
「CF509A」Maximum in Table
Ann × ntableaisdefinedasfollows:Thefirstrowandthefirstcolumncontainones,thatis:ai, 1 = a1, i = 1foralli = 1, 2, ..., n.Eachoftheremainingnumbersinthetableisequaltothesumofthenumberaboveitandthenumbertotheleftofit.Inotherwords,theremainingelementsaredefinedbytheformulaai, j = ai - 1, j + ai, j - 1.Theseconditionsdefineallthevaluesinthetable.Youaregivenanumbern.Younee...
「CF508A」Pasha and Pixels
Pashaloveshisphoneandalsoputtinghishairup...Butthehairisnowirrelevant.Pashahasinstalledanewgametohisphone.Thegoalofthegameisfollowing.Thereisarectangularfieldconsistingofnrowwithmpixelsineachrow.Initially,allthepixelsarecoloredwhite.Inonemove,Pashacanchooseanypixelandcoloritblack.Inparticular,hecanchoosethepixelthatisalreadyblack,thenaftertheboy'smovethepixeldoesnotchange,thatis,itremains...
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