DescriptionThecowshaverunoutofhay,ahorribleeventthatmustberemediedimmediately.Bessieintendstovisittheotherfarmstosurveytheirhaysituation.ThereareN(2<=N<=2,000)farms(numbered1..N);BessiestartsatFarm1.She'lltraversesomeoralloftheM(1<=M<=10,000)two-wayroadswhoselengthdoesnotexceed1,000,000,000thatconnectthefarms.Somefarmsmaybemultiplyconnectedwithdifferentlengthroads.Allfarm...
DescriptionGiveatreewithnvertices,eachedgehasalength(positiveintegerlessthan1001).Definedist(u,v)=Themindistancebetweennodeuandv.Giveanintegerk,foreverypair(u,v)ofverticesiscalledvalidifandonlyifdist(u,v)notexceedk.Writeaprogramthatwillcounthowmanypairswhicharevalidforagiventree.InputTheinputcontainsseveraltestcases.Thefirstlineofeachtestcasecontainstwointegersn,k.(n<=10000)Thefollowi...
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