![「BZOJ1648」[Usaco2006 Dec] Cow Picnic 奶牛野餐](http://hzwer.com/wp-content/themes/ly/image/image_post/D7BF1FF0-887A-496F-9101-C08B97A1C442.png)
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...
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