求 S=a+aa+aaa+…+aaaa…a 之值，其中a是一个数字。例如：2+22+222+2222+22222（此时n=5）, n由键盘输入。-For S = a+ Aa+ Aaa+ ...+ Aaaa ... a s value, in which a is a number. For example: 2+ 22+ 222+ 2222+ 22222 (At this point n = 5), n from the keyboar

求一个3行3列矩阵的转置矩阵（即第一行为第一列，第二行为第二列，第三行为第三列构成的矩阵）-For a 3-line 3 matrix transpose matrix (the first act of the first column, the second act of the second column, the third act constitute the third column of matrix)