func_code_string: #include <bits/stdc++.h>   using namespace std;   int count_inversions(vector<int> v) {     int t = 0;     for (int i = 0; i < (int)v.size(); ++i)       for (int j = i + 1; j < (int)v.size(); ++j)         if (v[i] > v[j]) t++;     return t;   }   int main() {     int n;     scanf( %d , &n);     vector<int> v(n);     for (int i = 0; i < n; ++i) scanf( %d , &v[i]);     int inversions = count_inversions(v);     cout << (inversions / 2) * 4 + (inversions % 2) << endl;   }   