PAT 1002. A+B for Polynomials C语言

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

Input

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

For each test case you should output the sum 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 to 1 decimal place.

Sample Input

2 1 2.4 0 3.2
2 2 1.5 1 0.5

Sample Output

3 2 1.5 1 2.9 0 3.2

Tips：double输入使用%lf

#include 
int main(void){
    int n,i,max=0,k,count=0;
    double s,a[1001]={0};
    for (int j=0;j<2;j++){
        scanf("%d",&n);
        for (i=1;i<=n;i++){
            scanf("%d%lf",&k,&s);
            if (a[k]==0) count++;
            a[k]+=s;
            if (a[k]==0) count--;
            if (k>max) max=k;
        }
    }
    printf("%d",count);
    while (max>=0){
        if (a[max]!=0){
            printf(" %d %.1f",max,a[max]);
        }
        max--;
    }
    
}