人工智能中经典的八数码问题的求解。在输入文件中给出初始局面，则算出一个解。输出的是每个步骤之后的局面。最终局面是1-8的环绕排列(中间为空)。-Artificial Intelligence in the classic eight digital problem solving. Given in the input file the initial situation, then figure out a solution. After each step the output is the situation. Final situation is arranged around 1-8 (middle is empty).