将两个一元n次多项式相加，并输出相加后的新的一元n次多项式

(1) 从input.txt文件读入一元多项式的系数和指数，用尾插法建立一元多项式的链

表。

(2) 以输入系数0为结束标志。

(3) 并约定建立多项式链表时，总是按指数从小到大的顺序排列。

(4) 要求借鉴第一章课件中给出的编程思路，一元多项式链表采用带头结点的单链表

实现。-The two one yuan polynomial of degree n, and outputs the added new one yuan polynomial of degree n (1) from input.txt file is read into one yuan polynomial coefficients and indices, with the tail establish a polynomial interpolation of the list. (2) to enter the coefficient 0 to end flag. (3) They agreed to establish polynomial linked list is always exponentially small to large order. (4) requires learning courseware given in the first chapter programming ideas, one yuan polynomial linked list nodes using the lead single linked list implementation.