数据结构，一元多项式相加。已编译通过，书本基本算法-Data structure, the sum of one yuan polynomial. Compiled by, books basic algorithm

一元多项式的计算，(1)输入并建立多项式； (2)输出多项式； (3)两个多项式相加，建立并输出和多项式；如：(x+10)+(2x+5)=3x+15 (4)两个多项式相减，建立并输出差多项式。如：(x+10)-(2x+5)=-x+5 -One yuan polynomial calculation, (1) the input and the establishment of a polynomial (2) polynomial output (3) two polynom

数据结构一元多项式的相加、乘，实现多重*的运算-Data structure is one yuan polynomial addition, multiplication, realize multiple* operation