数据结构矩阵旋转 任意构造一个n×n矩阵，将该矩阵逆时针旋转90度并输出 输入的矩阵的阶数0≦n≦50，当输入为0到50之间的小数时，系统自动为其取整-Arbitrary rotation matrix data structure to construct a nn matrix, the matrix is ​ ​ rotated 90 degrees counterclockwise and outputs the input matrix order 0 ≦ n ≦ 50, when the input is a decimal between 0 and 50, the system automatically for Rounding