求解八数码问题,初始状态存放在文件中，读入后使用A*算法求解8数码问题，目标状态为1238_4765，即从左上角开始为1，然后按顺时针排列在九宫格中。输出为具体求解步骤-Solving the eight digital issues, the initial state stored in the document, read to use the A* algorithm to solve 8 digital issues, the target state for the 1238_476