#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic warning "-Wunused-function"
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;

} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int tt;
  cin >> tt;
  while (tt--) {
    int n;
    cin >> n;
    VI a(2 * n);
    rep(i, n) cin >> a[2*i];
    rep(i, n) cin >> a[2*i+1];
    rep(i, n) if (a[2*i] < a[2*i+1]) swap(a[2*i], a[2*i+1]);
    VI d0, d1;
    for (int x : a) {
      auto it = lower_bound(all(d0), x);
      if (it == d0.end()) {
        d0.emplace_back(x);
      } else {
        int y = *it;
        *it = x;
        it = lower_bound(all(d1), y);
        if (it == d1.end()) d1.emplace_back(y);
        else *it = y;
      }
    }
    cout << d0.size() + d1.size() << '\n';
  }
}