1020 PAT

在编译器上运行没问题，提交显示编译错误

# include<stdio.h>
# include<stdlib.h>
struct YB
{
    int a,b;
    double c;
}yb[1000];

int cmp( const void *a ,const void *b) 
{ 
   return (*(YB *)a).c > (*(YB *)b).c ? -1 : 1; 
}  

int main()
{
    int N,D,i;
    double sum;
    scanf("%d %d",&N,&D);
    for(i=0;i<N;i++)
    {
        scanf("%d",&yb[i].a);
    }
    for(i=0;i<N;i++)
    {
        scanf("%d",&yb[i].b);
    }
    for(i=0;i<N;i++)
    {
        yb[i].c = yb[i].b *1.0 /  yb[i].a;
    }
    
    qsort(yb,N,sizeof(yb[0]),cmp);
    
     for(i=0;1;i++)
     {
         if(D - yb[i].a <= 0)
         {
             break;
        }
        
        sum = sum + yb[i].b;
        D = D - yb[i].a;
    }
    
    sum = sum + D*yb[i].c;
    
    printf("%.2lf",sum);
    return 0;
}