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>
  const int N = 1000005;
  int n, t, m;
  inline void read(int &x) {
    register char ch = 0;
    register bool w = 0;
    for (x = 0; !std::isdigit(ch); w |= ch == '-', ch = getchar())
      ;
    for (; std::isdigit(ch); x = x * 10 + ch - '0', ch = getchar())
      ;
    (w) && (x = -x);
    return;
  }
  int ai[N], bi[N], pi[N], tmp[N * 2], cnt = 0, q[N * 2];
  std::vector<int> vec[N];
  long long ans;
  void merge(int l, int r) {
    if (l == r) return;
    int mid = (l + r) >> 1;
    merge(l, mid);
    merge(mid + 1, r);
    int i = l, j = mid + 1, k = l;
    while (i <= mid && j <= r) {
      if (q[i] <= q[j])
        tmp[k++] = q[i++];
      else
        tmp[k++] = q[j++], ans += mid - i + 1;
    }
    while (i <= mid) tmp[k++] = q[i++];
    while (j <= r) tmp[k++] = q[j++];
    for (int i = l; i <= r; ++i) q[i] = tmp[i], tmp[i] = 0;
  }
  int pre[N], suf[N];
  void divide(int l, int r, int pl, int pr) {
    if (pl > pr || l > r) return;
    if (l == r) {
      for (int i = pl; i <= pr; ++i) pi[i] = l;
      return;
    }
    int mid = (pl + pr) >> 1;
    int val = bi[mid];
    for (int i = l - 1; i <= r + 1; ++i) pre[i] = suf[i] = 0;
    for (int i = l; i <= r; ++i) {
      if (ai[i] > val)
        pre[i] = pre[i - 1] + 1;
      else
        pre[i] = pre[i - 1];
    }
    for (int i = r; i >= l; --i) {
      if (ai[i] < val)
        suf[i] = suf[i + 1] + 1;
      else
        suf[i] = suf[i + 1];
    }
    int loc = 0, minn = 1e9;
    for (int i = l; i <= r; ++i) {
      if (pre[i - 1] + suf[i] < minn) {
        minn = pre[i - 1] + suf[i];
        loc = i;
      }
    }
    pi[mid] = loc;
    divide(l, pi[mid], pl, mid - 1);
    divide(pi[mid], r, mid + 1, pr);
  }
  void solve() {
    read(n), read(m);
    for (int i = 1; i <= n; ++i) read(ai[i]);
    for (int i = 1; i <= m; ++i) read(bi[i]);
    cnt = 0, ans = 0;
    std::sort(bi + 1, bi + m + 1);
    divide(1, n + 1, 1, m);
    for (int i = 1; i <= m; ++i) vec[pi[i]].push_back(i);
    for (int i = 1; i <= n + 1; ++i) {
      for (auto v : vec[i]) q[++cnt] = bi[v];
      if (i <= n) q[++cnt] = ai[i];
    }
    merge(1, cnt);
    for (int i = 0; i <= n + 1; ++i) std::vector<int>().swap(vec[i]), ai[i] = 0;
    printf("%lld\n", ans);
  }
  int main() {
    read(t);
    while (t--) solve();
    return 0;
  }
  