func_code_string: #include <bits/stdc++.h>   using namespace std;   long long int f = 1, mod;   void calc(int sum, int t) {     for (int i = 1; i <= sum; i++) {       if (i % 2 or !t)         f = (f * i) % mod;       else         f = (f * (i / 2)) % mod, t--;     }   }   int main() {     int n, p, count = 0, a[200001] = {0};     cin >> n;     vector<pair<int, int> > v;     for (int i = 1; i <= n; i++) cin >> p, v.push_back(make_pair(p, i));     for (int i = 1; i <= n; i++) cin >> p, v.push_back(make_pair(p, i));     sort(v.begin(), v.end());     int i = 0;     cin >> mod;     while (i < v.size()) {       int t = 0, sum = 0;       count++;       a[v[i].second] = count;       i++;       while (i < 2 * n and v[i].first == v[i - 1].first) {         if (a[v[i].second] == count) t++;         a[v[i].second] = count;         sum++;         i++;       }       calc(sum + 1, t);     }     cout << f;   }   