POJ1077&HDU1043 Eight 八数码第七境界 AStar hash 康托展开 最小堆优化 奇偶剪枝
DescriptionThe15-puzzlehasbeenaroundforover100years;evenifyoudon'tknowitbythatname,you'veseenit.Itisconstructedwith15slidingtiles,eachwithanumberfrom1to15onit,andallpackedintoa4by4framewithonetilemiss