0分，但是样例正确

#include<iostream>
#include<cstdio>
using namespace std;
int main()
{

    double sum = 0;
    double a[10] = { 28.9,32.7,45.6,78,35,86.2,27.8,43,56,65 };
    double b[10] = { 0 };
    for (int i = 0; i < 10; i++)
    {
        cin >> b[i];
    }
    for (int i = 0; i < 10; i++)
    {
        sum += b[i] * a[i];
    }
    printf("%.1llf", sum);
    return 0;
}