#include<bits/stdc++.h>
#define ll long long 
using namespace std;

int main(){
  int t;
  cin >> t;
  while (t--){
    int n, c = 0;
    cin >> n;
    vector<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];
    }
    for (int i = 0; i + 1 < n; i++){
      if (a[i] == a[i + 1] && b[i] < b[i + 1]) c++;
      else break;
    }
    cout << n - c << endl;
  }
}