CSU七月校赛B

#include <iostream>
#include<cstdio>
#include<algorithm>
#include<cstring>
#include<cmath>
using namespace std;
int cmp(int a,int b)
{
    return a>b;
}
int a[],b[];
int main()
{
    int n;
    int t;
    int sum;
    scanf("%d",&t);
    while(t--)
    {
        sum=;
        scanf("%d",&n);

        for(int i=;i<n;i++)
        {
            scanf("%d",&a[i]);
        }
        sort(a,a+n,cmp);
        for(int i=;i<n;i++)
        {
            scanf("%d",&b[i]);
        }
        sort(b,b+n);
        sum=;
        for(int i=,j=;i<n,j<n;i++,j++)
        {
            sum += (a[i]-b[j])*(a[i]-b[j]);
        }
        printf("%d\n",sum);//错了，lld！！
    }
    return ;
}