说明： 这是一个基于AStar算法,用于四国军旗中的工兵搜索!(以前这一块是单独写的,后来又加到的主程序中的,但那份不知道放到哪里 (This is based on the AStar algorithm, for the four countries in the flag of the engineer search! (this piece was previously written separately and later added to the main program, but the copy does not know where to put it)
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