1002. A+B for Polynomials (25)

#include<stdio.h>
#define N 1000
int main()
{
    double poly[N+1]={0};
    int n,m,i;
    int exp;
    double coef;
    scanf("%d",&n);
    m=n;
    for(i=0;i<n;i++)
    {
        scanf(" %d %lf",&exp,&coef);
        poly[exp]=coef;
    }
    scanf("%d",&n);
    m+=n;
    for(i=0;i<n;i++)
    {
        scanf(" %d %lf",&exp,&coef);
        if(poly[exp])m--;
        poly[exp]+=coef;
        if(poly[exp]==0)m--;
    }
    printf("%d",m);
    for(i=N;i>=0;i--)
    {
        if(poly[i])printf(" %d %.1lf",i,poly[i]);
    }
}