编程序，按如下要求来求解n元一次线性方程组（假设方程组具有唯一解）。

　　（1）方程个数n之值由用户通过键盘输入；

　　（2）方程组存放在“增广矩阵”A之中，而n行n+1列的A存储空间通过new来动态分配，且A的各元素值也由用户通过键盘输入；

-Allocation procedures, the following requirements to solve the n-a system of linear equations (assuming a unique solution of equations). (1) the number n of the value equation by the user through the keyboard input　(2) equations stored in the　augmented matrix　A, while n line n+ 1 column A storage space through the new dynamically allocated, and A The value of each element by the user through the keyboard input