#include <bits/stdc++.h>

using namespace std;

int main()
{
    int t;
    cin>>t;
    while(t--){
        int n;
        cin>>n;
        int g[n],w[n],fg[n],fw[n],sg[n],sw[n];
        for(int i=0;i<n;i++){
            cin>>g[i];
            fg[i]=g[i];
        }
        for(int i=0;i<n;i++){
            cin>>w[i];
            fw[i]=w[i];
        }
       
        
        map <int,int> mp;
        for(int i=0;i<n;i++){
            mp.insert({g[i],w[i]});
        }
        int max=0;
        int count=0;
        for(auto it=mp.rbegin();it!=mp.rend();it++){
            if(max<it->second){
                count++;
                max=it->second;
            }
        }
        cout<<count<<endl;
        }

    return 0;
}

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