SPOJ Problem 1025:Fashion Shows

#include<cstring>
#include<iostream>
#include<algorithm>
using namespace std;
int n,t,i,j,ans,x;
int a[1005],b[1005];
int main(){
    cin>>t;
    while(t--){
        ans=0;
        cin>>n;
        for (i=1;i<=n;i++)
            cin>>a[i];
        for (i=1;i<=n;i++)
            cin>>b[i];
        sort(a+1,a+n+1);
        sort(b+1,b+n+1);
        for (i=1;i<=n;i++)
            ans+=a[i]*b[i];
        cout<<ans<<endl;
    }
}