甲级-1009 Product of Polynomials (25 分)

题目：

This time, you are supposed to find A×B where A and B are two polynomials.

Input Specification:

Each input file contains one test case. Each case occupies 2 lines, and each line contains the information of a polynomial:
K N₁ a_N1 N₂ a_N2 ...N_K a_NK
where K is the number of nonzero terms in the polynomial, N_i and a_Ni(i=1,2,⋯,K) are the exponents and coefficients, respectively. It is given that 1≤K≤10, 0≤N_K<⋯2 1 ≤1000.

Output Specification:

For each test case you should output the product of A and B in one line, with the same format as the input. Notice that there must be NO extra space at the end of each line. Please be accurate up to 1 decimal place.

Sample Input:

2 1 2.4 0 3.2
2 2 1.5 1 0.5

Sample Output:

3 3 3.6 2 6.0 1 1.6

解题思路：

两层循环，分别将两个序列的每个元素的系数相乘、指数相加，最后再将具有相同指数的系数相加合并即可。
注意在此处只需要将系数真正为0的元素去除，而不需要将系数<0.05的元素去除，虽然后者在保留一位小数的情况下显示出来为0.0。

代码：

编译器：C++(g++)

#include 
#include 
#include