题解 100% AC

#include<bits/stdc++.h>
using namespace std;
int main(){
    double money[10]={28.9,32.7,45.6,78,35,86.2,27.8,43,56,65},all=0;
    int id;
    for(int i=0;i<10;i++){
        cin>>id;
        all+=id*money[i];
    }
    cout<<fixed<<setprecision(1)<<all;
	return 0;
}