模拟。
关键符号说明：
| Symbol | Explanation |
|---|---|
| nA/nB | Number of terms in A/B |
| factor | Coefficient of the term with certain exponent; For storing A |
| base | Exponent of a term present in A |
| sum | Coefficient of the term with certain exponent; For storing product of polynomials |
| tB | Temporary variable for holding the exponent of a term |
| tS | Temporary variable for holding the coefficient of a term |
#include<cstdio>
#include<cstring>
using namespace std;
const int MAXN=2000;
int nA,nB;
double factor[MAXN+1];
int base[MAXN+1];
double sum[MAXN+1];
int main(void) {
// freopen("in.txt","r",stdin);
scanf("%d",&nA);
int tB;
double tS;
for(int i=0;i<nA;i++){
scanf("%d%lf",&tB,&tS);
base[i]=tB;
factor[tB]=tS;
}
memset(sum,0,sizeof sum);
scanf("%d",&nB);
for(int i=0;i<nB;i++){
scanf("%d%lf",&tB,&tS);
for(int j=0;j<nA;j++)
sum[tB+base[j]]+=tS*factor[base[j]];
}
int cnt=0;
for(int i=MAXN;i>=0;i--) if(sum[i]!=0) cnt++;
printf("%d",cnt);
for(int i=MAXN;i>=0;i--) if(sum[i]!=0)
printf(" %d %.1f",i,sum[i]);
putchar('\n');
return 0;
}
/*
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
*/
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