说明：  魔方阵，古代又称“纵横图”，是指组成元素为自然数1、2、…、n的平方的n×n的方阵，其中每个元素值都不相等，且每行、每列以及主、副对角线上各n个元素之和都相等。本程序实现的功能有：输入一个随机阶数，可生成本阶数的魔方阵。
(Magic square array, also known as "vertical and horizontal diagram" in ancient times, refers to the natural number 1, 2 The sum of n elements in each row, column and the main and minor diagonals is equal. The function of this program is: input a random order, can generate the magic square matrix of cost order.)