3613.CowRelays求经过n条边的最短路,floyd+倍增QAQ[crayon-6767f629a35a6772133597/]2728.DesertKing最优比率生成树分数规划[crayon-6767f629a35b2451741322/]1639.PicnicPlanning带度数限制的最小生成树http://wenku.baidu.com/link?url=UKcnK1pZvaVwypQOrIFRTOPzM4edIlBmqvnZjZipGf2o_6u-aB1F2tFsMGdUQbA1O-96menmbgyxNoSoWKWBeJnr-RJKuG2yM4b6Jf7IvR3[crayon-6767f629a35...
Description Duetoalackofrain,FarmerJohnwantstobuildanirrigationsystemtosendwaterbetweenhisNfields(1<=N<=2000).Eachfieldiisdescribedbyadistinctpoint(xi,yi)inthe2Dplane,with0<=xi,yi<=1000.ThecostofbuildingawaterpipebetweentwofieldsiandjisequaltothesquaredEuclideandistancebetweenthem:(xi-xj)^2+(yi-yj)^2FJwouldliketobuildaminimum-costsystemofpipessothatallofhisfieldsarelinkedt...
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