把0~2^(n+m)-1的数写成2^n * 2^m的矩阵，使得位置相邻两数的二进制表示只有一位之差。-The 0 ~ 2 ^ (n+ m)-1 is written the number 2 ^ n* 2 ^ m matrix, so that the position adjacent to the two binary numbers that only a difference.