eight puzzle using RBFS and A* search and manhattan distance heuristic function

8 puzzle是西人喜欢玩的一个小游戏，这段小程序用四种人工智能算法来实现这个小游戏。 首先是A*查找，包括Nilsson’s sequence score；Tiles Out of Place；Manhattan Distance；另外还有一种算法是air distance-8 puzzle a foreigner like to play a little game, this small program with four kinds of artificial intelligen

8/15-Puzzle Solver Algorithm: IDA*, A* Heuristic: Pattern Database, Manhattan Distance