8_puzzle问题，初始状态下8个方块随机排列。编程序排列1～8方块的顺序，使得位于3*3的网格中，并且8个方块处于正确的位置。-8_puzzle problem, the initial state of eight box random order. Programmed with a box-8 in the order, made at the 3 * 3 grid, and eight box at the right place.