description: You are given two arrays of integers a_1, a_2, …, a_n and b_1, b_2, …, b_m.
  
  You need to insert all elements of b into a in an arbitrary way. As a result you will get an array c_1, c_2, …, c_{n+m} of size n + m.
  
  Note that you are not allowed to change the order of elements in a, while you can insert elements of b at arbitrary positions. They can be inserted at the beginning, between any elements of a, or at the end. Moreover, elements of b can appear in the resulting array in any order.
  
  What is the minimum possible number of inversions in the resulting array c? Recall that an inversion is a pair of indices (i, j) such that i < j and c_i > c_j.
  
  Input
  
  Each test contains multiple test cases. The first line contains the number of test cases t (1 ≤ t ≤ 10^4). Description of the test cases follows.
  
  The first line of each test case contains two integers n and m (1 ≤ n, m ≤ 10^6).
  
  The second line of each test case contains n integers a_1, a_2, …, a_n (1 ≤ a_i ≤ 10^9).
  
  The third line of each test case contains m integers b_1, b_2, …, b_m (1 ≤ b_i ≤ 10^9).
  
  It is guaranteed that the sum of n for all tests cases in one input doesn't exceed 10^6. The sum of m for all tests cases doesn't exceed 10^6 as well.
  
  Output
  
  For each test case, print one integer — the minimum possible number of inversions in the resulting array c.
  
  Example
  
  Input
  
  
  3
  3 4
  1 2 3
  4 3 2 1
  3 3
  3 2 1
  1 2 3
  5 4
  1 3 5 3 1
  4 3 6 1
  
  
  Output
  
  
  0
  4
  6
  
  Note
  
  Below is given the solution to get the optimal answer for each of the example test cases (elements of a are underscored).
  
    * In the first test case, c = [\underline{1}, 1, \underline{2}, 2, \underline{3}, 3, 4]. 
    * In the second test case, c = [1, 2, \underline{3}, \underline{2}, \underline{1}, 3]. 
    * In the third test case, c = [\underline{1}, 1, 3, \underline{3}, \underline{5}, \underline{3}, \underline{1}, 4, 6]. 
solution: #include <bits/stdc++.h>
  #pragma GCC optimize(2)
  using namespace std;
  const int N = 3e6 + 10, M = 2 * N, mod = 998244353;
  int n, m;
  int a[N], b[N];
  int ans[N];
  void func(int l, int r, int L, int R) {
    if (l > r) return;
    int mid = l + r >> 1;
    int Pos = L, Min = 1e9, first = 0, second = 0;
    for (int i = L; i <= R; i++) {
      if (b[mid] > a[i]) second++;
    }
    for (int i = L; i <= R; i++) {
      if (Min > first + second) {
        Min = first + second;
        Pos = i;
      }
      if (b[mid] < a[i]) first++;
      if (b[mid] > a[i]) second--;
    }
    ans[mid] = Pos;
    func(l, mid - 1, L, Pos), func(mid + 1, r, Pos, R);
  }
  int c[N], tmp[N];
  long long acount;
  void merge_sort(int l, int r) {
    if (l == r) return;
    int mid = l + r >> 1;
    merge_sort(l, mid), merge_sort(mid + 1, r);
    for (int i = l, j = mid; i <= mid; i++) {
      while (j < r && c[j + 1] < c[i]) j++;
      acount += j - mid;
    }
    int i = l, j = mid + 1, cnt = 0;
    while (i <= mid && j <= r) {
      if (c[i] < c[j])
        tmp[++cnt] = c[i++];
      else
        tmp[++cnt] = c[j++];
    }
    while (i <= mid) tmp[++cnt] = c[i++];
    while (j <= r) tmp[++cnt] = c[j++];
    for (int i = l; i <= r; i++) c[i] = tmp[i - l + 1];
  }
  void solve() {
    cin >> n >> m;
    for (int i = 1; i <= n; i++) cin >> a[i];
    for (int i = 1; i <= m; i++) cin >> b[i];
    sort(b + 1, b + m + 1);
    func(1, m, 1, n + 1);
    int cnt = 0, i, j;
    for (i = 1, j = 1; i <= m; i++) {
      while (j < ans[i]) c[++cnt] = a[j++];
      c[++cnt] = b[i];
    }
    while (j <= n) c[++cnt] = a[j++];
    acount = 0;
    merge_sort(1, cnt);
    cout << acount << '\n';
  }
  int main() {
    ios::sync_with_stdio(0), cin.tie(0);
    int t;
    cin >> t;
    while (t--) solve();
    return 0;
  }
  