#include<bits/stdc++.h>
using namespace std;
double ans;
double a[15]={28.9,32.7,45.6,78,35,86.2,27.8,43,56,65};
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	for(int i=0;i<10;i++)
	{
		int x;
		scanf("%d",&x);
		ans+=x*a[i];
	}
	printf("%.1lf",ans);
	return 0;
}

#include <iostream>
#include <stack>
#include <cmath>
#include <vector>
#include <string.h>
#include <queue>
#include <stdio.h>
#include <iomanip>
#include <cstdio>
#include <algorithm>
#define int long long
using namespace std;
const int N = 1e5 + 10;
const int INF = 0x3f3f3f3f;
double a[11] = {28.9, 32.7, 45.6, 78.0, 35.0, 86.2, 27.8, 43.0, 56.0, 65.0, 0};
double x;
signed main()
{
	double ans = 0;
	for(int i = 0; i < 10; i++)
	{
		cin >> x;
		ans += a[i] * x;
	}
	cout << fixed << setprecision(1) << ans << endl;
	return 0;
}

有打表那味了

#include<bits/stdc++.h> using namespace std; int main(){ double a,b,c,d,e,f,g,h,i,j; cin>>a>>b>>c>>d>>e>>f>>g>>h>>i>>j; cout<<a28.9+b32.7+c45.6+d78+e35+f86.2+g27.8+h43+i56+j65; return 0; }

#include <iostream> #include <cmath> #include <iomanip> #include <stack> #include <algorithm> #include <string> #include <cstring> #include <cstdio> using namespace std; const int INF = 0x3f3f3f3f; const int N = 1e4 + 10; double a[21] = {0 , 28.9 , 32.7 , 45.6 , 78 , 35 , 86.2 , 27.8 , 43 , 56 , 65} , sum , n; int main() { for (int i = 1;i <= 10;i++) { cin >> n; sum = sum + a[i] * n; } cout << sum; return 0; }

#include <iostream>
#include <iomanip>
using namespace std;
double b[20]={0,28.9,32.7,45.6,78,35,86.2,27.8,43,56,65};
double a[110]={ },ans;
int main()
{
	for(int i=1;i<=10;i++)
	{
		cin>>a[i];
	}
	for(int i=1;i<=10;i++)
	{
		ans+=b[i]*a[i];
	}
	cout<<fixed<<setprecision(1)<<ans;
	return 0;
 } 

#include<iostream>
#include<iomanip>
#include<math.h>
using namespace std;
int main(){
	double a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,s;
	cin>>a1>>a2>>a3>>a4>>a5>>a6>>a7>>a8>>a9>>a10;
	s=a1*28.9+a2*32.7+a3*45.6+a4*78+a5*35+a6*86.2+a7*27.8+a8*43+a9*56+a10*65;
	cout<<fixed<<setprecision(1)<<s; 
}

#include <bits/stdc++.h>
using namespace std;
int main(){
	double a[11]={28.9,32.7,45.6,78,35,86.2,27.8,43,56,65},s=0;
	int n;
	for(int i=0;i<=10;i++){
		cin>>n;
		s+=n*a[i];
	}
	cout<<s<<endl;
}

#include <bits/stdc++.h>

using namespace std;

int main(void)
{
	double price[10] = { 28.9, 32.7, 45.6, 78.0, 35.0, 86.2, 27.8, 43.0, 56.0, 65.0 };

	int x[9];

	for (int i = 0; i <= 9; i++)
	{
		cin >> x[i];
	}

	float f = 0;

	for (int i = 0; i <= 9; i++)
	{
		f += price[i] * x[i];
	}

	cout << f;

	return 0;
}

#include<queue>
#include<math.h>
#include<stack>
#include<stdio.h>
#include<iostream>
#include<vector>
#include<iomanip>
#include<string.h>
#include<algorithm>
#include<bits/stdc++.h>
using namespace std;
double a[11]={0,28.9,32.7,45.6,78,35,86.2,27.8,43,56,65};
int main()
{
	int x;
	double sum=0.0;
	for(int i=1;i<=10;i++)
	{
		cin>>x;
		sum+=a[i]*x;
	}
	cout<<fixed<<setprecision(1)<<sum<<endl;
}