华南理工大学

用python

    from decimal import *
     
    t = int(input())
    for case in range(t):
        with localcontext() as ctx:`加粗样式`
            ctx.prec=600
            n = int(input())
            a = Decimal(sum(map(int,input().strip().split())))
            b = Decimal(sum(map(int,input().strip().split())))
            ans = a*b/n
            print(format(ans,".30f"))

模拟除法

#include<iostream>
#include<stdio.h>
using namespace std;
void solve(long long ans,long long n)
{
    long long res[32];
    res[0]=ans/n;
    ans=ans%n;
    for (int i=1; i<=31; i++)
    {
        ans*=10;
        res[i]=ans/n;
        ans=ans%n;
    }
    if (res[31]>=5)
    {
        res[30]++;
        for (int i=30; i>0; i--)
        {
            if (res[i]>=10)
            {
                res[i]=res[i]%10;
                res[i-1]+=1;
            }
        }
    }
    printf("%lld.",res[0]);
    for (int i=1; i<=30; i++)
    {
        printf("%lld",res[i]);
    }
    printf("\n");
}
int main()
{
    long long t,n;
    long long m;
    cin>>t;
    long long s1=0,s2=0;
    while (t--)
    {
        scanf("%d",&n);
        s1=0;
        s2=0;
        for (int i=1; i<=n; i++)
        {
            scanf("%lld",&m);
            s1+=m;
        }
        for (int i=1; i<=n; i++)
        {
            scanf("%lld",&m);
            s2+=m;
        }
        s1=s1*s2;
        solve(s1,n);
    }
    return 0;
}

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