能够完成两个多项式的相加、相减，并将结果输入；

　　在上交资料中请写明：存储结构、多项式相加的基本过程的算法（可以使用程序流程图） 、源程序、测试数据和结果、算法的时间复杂度、另外可以提出算法的改进方法；-Able to complete two polynomial addition, subtraction, and the results input　in hand over data, please specify: storage structure, the basic process of adding polynomial algorithm (you can use the program flow chart), the source procedures, test data and results, the algorithm' s time complexity, the other proposed algorithms can be improved method