DescriptionThecowsarehavingapicnic!EachofFarmerJohn'sK(1<=K<=100)cowsisgrazinginoneofN(1<=N<=1,000)pastures,convenientlynumbered1...N.ThepasturesareconnectedbyM(1<=M<=10,000)one-waypaths(nopathconnectsapasturetoitself).Thecowswanttogatherinthesamepasturefortheirpicnic,but(becauseoftheone-waypaths)somecowsmayonlybeabletogettosomepastures.Helpthecowsoutbyfiguringouth...
DescriptionAcm,atreasure-explorer,isexploringagain.Thistimeheisinaspecialmaze,inwhichtherearesomedoors(atmost5doors,representedby'A','B','C','D','E'respectively).Inordertofindthetreasure,Acmmayneedtoopendoors.However,toopenadoorheneedstofindallthedoor'skeys(atleastone)inthemazefirst.Forexample,ifthereare3keysofDoorA,toopenthedoorheshouldfindallthe3keysfirst(that'sthree'a'swhichdenote...
题目描述FarmerJohn'sfamilypitchesinwiththechoresduringmilking,doingallthechoresasquicklyaspossible.AtFJ'shouse,somechorescannotbestarteduntilothershavebeencompleted,e.g.,itisimpossibletowashthecowsuntiltheyareinthestalls.FarmerJohnhasalistofN(3<=N<=10,000)choresthatmustbecompleted.Eachchorerequiresanintegertime(1<=lengthoftime<=100)tocompleteandtheremaybeotherchoresthatmustbe...
近期评论