Practice
P0834To do[Usaco2005 jan]Muddy Fields 泥泞的牧场Official CodemaoIntermediateP0835To do[SDOI2009]晨跑Official CodemaoUpper intermediateP0836To do[Usaco2008 Mar]The Loathesome Hay Baler麻烦的干草打包机Official CodemaoUpper intermediateP0837To do[Sdoi2011]消耗战Official CodemaoUpper intermediateP0838To do[Usaco2008 Mar]Cow Travelling游荡的奶牛Official CodemaoElementaryP0839To do[Usaco2007 Dec]Building Roads 修建道路Official CodemaoIntermediateP0840To do[Usaco2007 Feb]Cow Sorting牛排序Official CodemaoIntermediateP0841To do[Usaco2005 Oct]Close EncounterOfficial CodemaoElementaryP0842To do[Usaco2007 Feb]Lilypad Pond 荷叶池塘Official CodemaoIntermediateP0843To do[Usaco2005 Mar]Out of Hay 干草危机Official CodemaoElementaryP0844To do[Usaco2008 Feb]Line连线游戏Official CodemaoElementaryP0846To do[Usaco2008 Dec]Hay For Sale 购买干草Official CodemaoElementary100.0%P0847To do[Usaco2005 Dec]Scales 天平Official CodemaoIntermediateP0848To do[Usaco2005 Open]Disease Manangement 疾病管理Official CodemaoIntermediateP0849To do[Hnoi2010]Bus 公交线路Official CodemaoUpper intermediateP0850To do[Usaco2006 Dec]Wormholes 虫洞Official CodemaoElementaryP0851To do[Usaco2005 Oct]Allowance 津贴Official CodemaoIntermediateP0852To doSelling LandOfficial CodemaoUpper intermediateP0853To do[Usaco2007 Open]Dining吃饭Official CodemaoIntermediateP0854To do[Poi2012]SquarksOfficial CodemaoUpper intermediateP0855To do[Baltic2000]Division expressionOfficial CodemaoElementaryP0856To domodeOfficial CodemaoElementaryP0858To doSgu338 CasinoOfficial CodemaoUpper intermediateP0859To do[Usaco2006 Jan]Corral the Cows 奶牛围栏Official CodemaoIntermediateP0860To do矩形计算Official CodemaoAdvancedP0862To do[Cqoi2010]扑克牌Official CodemaoElementaryP0863To do[Zjoi2005]Swamp 沼泽鳄鱼Official CodemaoUpper intermediateP0864To do[JSOI2010]下棋问题Official CodemaoUpper intermediateP0865To do[HNOI2008]GT考试Official CodemaoUpper intermediateP0866To do[SCOI2006]zh_treeOfficial CodemaoIntermediateP0867To do[HAOI2006]数字序列Official CodemaoUpper intermediateP0868To do[CTSC2004]网络改造networkOfficial CodemaoUpper intermediateP0869To do取整矩阵Official CodemaoUpper intermediateP0870To do[HNOI2002]Tinux系统Official CodemaoUpper intermediateP0871To do[Baltic2006]SquintOfficial CodemaoBeginner0.0%P0872To do[HNOI2006]马步距离Official CodemaoUpper intermediateP0873To do[Baltic2001]Mars MapsOfficial CodemaoIntermediateP0874To do[Baltic2004]SCALESOfficial CodemaoElementaryP0875To do最大利润Official CodemaoElementaryP0876To do[Usaco2009 Nov]lights 燈Official CodemaoIntermediateP0877To do[Ioi2000]Post加强版Official CodemaoUpper intermediateP0878To do不相交路径Official CodemaoUpper intermediateP0879To doCountryOfficial CodemaoUpper intermediateP0880To do[Baltic2007]Ranklist sorting名次排序问题Official CodemaoAdvancedP0881To do[Usaco2005 jan]Naptime 午睡时间Official CodemaoIntermediateP0882To do分裂Official CodemaoUpper intermediateP0883To do[Usaco2009 Jan]气象牛BaricOfficial CodemaoIntermediateP0884To do[Usaco2009 Hol]Transmission Delay 传输谍延时Official CodemaoUpper intermediateP0885To do[Usaco2009 Mar]Moon Mooing 哞哞叫Official CodemaoIntermediateP0886To do[Usaco2007 Dec]穿越泥地Official CodemaoElementary