#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  cout.setf(ios::fixed);
  cout.precision(20);
  int T;
  cin >> T;
  while (T--) {
    int n;
    cin >> n;
    n *= 2;
    vector<int> a(n);
    for (int &x : a) {
      cin >> x;
    }
    map<int, int> left, right;
    map<int, bool> was;
    int red = 0, blue = 0;
    int res = n;
    for (int i = n - 1; i >= n / 2; i--) {
      int toEat = n / 2 - (n - i);
      red += (a[i] == 1);
      blue += (a[i] == 2);
      right[red - blue] = toEat;
      was[red - blue] = true;
      if (i == n / 2 && red == blue) {
        res = min(res, n / 2);
      }
      if (red == blue) {
        res = min(res, n / 2 + toEat);
      }
    }
    red = blue = 0;
    for (int i = 0; i < n / 2; i++) {
      int toEat = n / 2 - i - 1;
      red += (a[i] == 1);
      blue += (a[i] == 2);
      if (red == blue) {
        res = min(res, n / 2 + toEat);
      }
      if (was[blue - red]) {
        res = min(res, toEat + right[blue - red]);
      }
      if (i == n / 2 - 1 && red == blue) {
        res = min(res, n / 2);
      }
    }
    cout << res << "\n";
  }
}
