/*
/ author : eaugene
/ created at : 25-sep-2018 22:56:45
/
*/
#include <bits/stdc++.h>
using namespace std;
int main() {
int t=0;
cin>>t;
while(t--)
{
int n,x,y;
cin>>n>>x>>y;
int a[n],b[n];
for(int i=0;i<n;i++)
cin>>a[i];
for(int i=0;i<n;i++)
cin>>b[i];
vector < pair < int , int >> v;
for(int i=0;i<n;i++)
{
v.push_back(make_pair(abs(a[i]-b[i]),i));
}
sort(v.begin(),v.end());
int ans=0;
reverse(v.begin(),v.end());
for(int i=0;i<n;i++)
{
int j=v[i].second;
if(x&&y)
{
if(a[j]>b[j])
{
ans+=a[j];
x--;
}
else
{
ans+=b[j];
y--;
}
}
else if(x)
{
ans+=a[j];
x--;
}
else if(y)
{
ans+=b[j];
y--;
}
}
cout<<ans<<endl;
}
return 0;
}
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