题解 100% AC

#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,a[10001],sum=0;
    double ans;
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>a[i];
        sum+=a[i];
    }
    ans=sum;
    cout<<sum<<" "<<fixed<<setprecision(5)<<ans/n;
	return 0;
}