题目描述：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 ... NK a_NK, where K is the number of nonzero terms in the polynomial, Ni and a_Ni (i=1, 2, ..., K) are the exponents and coefficients, respectively. It is given that 1 <= K <= 10, 0 <= NK < ... < N2 < N1 <=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.

2 1 2.4 0 3.2
2 2 1.5 1 0.5

3 3 3.6 2 6.0 1 1.6

#include<cstdio>
#include<map>
using namespace std;

int main(int argc,char *argv[])
{
	int k1,k2;
	int exp;
	float coef;
	int i,j;
	map<int,float> m1;
	map<int,float> m2;
	map<int,float> m3;
	scanf("%d",&k1);
	for(i=0;i<k1;i++)
	{
		scanf("%d%f",&exp,&coef);
		m1.insert(pair<int,float>(exp,coef));
	}
	scanf("%d",&k2);
	for(j=0;j<k2;j++)
	{
		scanf("%d%f",&exp,&coef);
		m2.insert(pair<int,float>(exp,coef));
	}
	map<int,float>::iterator it1=m1.begin();
	for(;it1!=m1.end();it1++)
	{
		map<int,float>::iterator it2=m2.begin();
		for(;it2!=m2.end();it2++)
		{
			exp=it1->first+it2->first;//指数相加
			coef=it1->second*it2->second;//系数相乘
			map<int,float>::iterator it3;
			it3=m3.find(exp);
			if(it3==m3.end())//生成新的指数，且系数不为零则插入
			{
				if(coef==0)
					;
				else
					m3.insert(pair<int,float>(exp,coef));
			}
			else//更新系数即可
			{
				coef=coef+it3->second;
				if(coef==0)
					m3.erase(it3);
				else
				{
					m3.erase(it3);
				    m3.insert(pair<int,float>(exp,coef));
				}
			}
		}
	}
	if(!m3.empty())
	{
		printf("%lu",m3.size());
	    map<int,float>::iterator it3=m3.end();
	    it3--;
	    for(;it3!=m3.begin();it3--)
			printf(" %d %.1f",it3->first,it3->second);
	    printf(" %d %.1f",it3->first,it3->second);
	    printf("\n");
	}
	else
		printf("0\n");//结果为零的特殊情况

	return 0;
}

#include <stdio.h>
#include <stdlib.h>

typedef struct
{
    int expo;//指数
    double coef;//系数
}poly;

int main()
{
    int k1, k2;
    poly *a, *b;
    int i,j;
    int max;//能够出现的最大指数
    poly *c;
    int zhishu, xishu;
    int count;

    while(scanf("%d", &k1) != EOF)
    {
        a = (poly *)malloc(k1 * sizeof(poly));
        for(i = 0; i < k1; i ++)
        {
            scanf("%d %lf", &a[i].expo, &a[i].coef);
        }
        scanf("%d", &k2);
        b = (poly *)malloc(k2 * sizeof(poly));
        for(i = 0; i < k2; i ++)
        {
            scanf("%d %lf", &b[i].expo, &b[i].coef);
        }
        max = a[0].expo + b[0].expo;
        c = (poly *)malloc((max + 1) * sizeof(poly));
        for(i = 0; i <= max; i ++)
        {
            c[i].expo = i;
            c[i].coef = 0;
        }//初始化结果
        for(i = 0; i < k1; i ++)
        {
            for(j = 0; j < k2; j ++)
            {
                zhishu = a[i].expo + b[j].expo;
                c[zhishu].coef += a[i].coef * b[j].coef; 
            }
        }
        count = 0;
        for(i = 0; i <= max; i ++)
        {
            if(c[i].coef != 0)
            {
                count ++;
            }
        }
        printf("%d", count);
        for(i = max; i >= 0; i --)
        {
            if(c[i].coef != 0)
            {
                printf(" %d %.1lf", i, c[i].coef);
            }
        }
        printf("\n");
    }
    return 0;
}