1 #include<cstdio>
 2 struct Poly{
 3     int exp;        //次数
 4     double coe;      //系数
 5 }A[1001];
 6 double Product[2001];
 7 int main(){
 8     int  n1, n2,  count = 0;                 
 9     scanf("%d",&n1); 
10     for(int i = 0; i < n1; i++){
11         scanf("%d %lf", &A[i].exp, &A[i].coe);
12     }
13     scanf("%d",&n2);
14     for(int i = 0; i < n2; i++){
15         int  Temp_exp;
16         double Temp_coe;
17         scanf("%d %lf", &Temp_exp, &Temp_coe);
18         for(int i = 0; i < n1; i++){
19             if(A[i].coe != 0){
20                 Product[A[i].exp + Temp_exp]  +=(A[i].coe * Temp_coe);
21             }
22         }    
23     }
24     for(int i = 0; i <= 2000; i++){
25         if(Product[i] != 0.0) {
26             count++;    
27         }            
28     }
29     printf("%d",count);
30     for(int i = 2000; i >= 0; i--){
31         if(Product[i] != 0.0) {
32             printf(" %d %.1f", i, Product[i]);    
33         }
34     }    
35     return 0;
36 }