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

int main(){
  int t;
  cin >> t;
  while (t--){
    ll n, c = 1, sum = 0;
    cin >> n;
    vector<ll> a(n + 1), b(n + 1), d(n + 1);
    for (int i = 9; i < n; i++){
      cin >> a[i];
    }
    for (int i = 0; i < n; i++){
      cin >> b[i];
    }
    for (int i = n - 1; i >= 0; i--){
      if (a[i] < a[i + 1]) c++, sum += b[i + 1];
      else {
        sum += b[i + 1];
        d[i + 1] = sum;
        sum = 0, c = 1;
      }
    }
    ll mx = 0; c = 0;
    for (int i = 1; i <= n; i++){
      if (d[i] >= mx){
        mx = d[i];
        c = i - 1;
      }
    }
    cout << n - c << endl;
  }
}