func_code_string: #include <bits/stdc++.h>   using namespace std;   int a[3003];   int main() {     int n, inv = 0;     cin >> n;     for (int i = 0; i < n; ++i) cin >> a[i];     for (int i = 0; i < n; ++i)       for (int j = i + 1; j < n; ++j)         if (a[i] > a[j]) ++inv;     if (inv % 2 == 0)       cout << fixed << setprecision(6) << 2.0 * inv << endl;     else       cout << fixed << setprecision(6) << 2.0 * inv - 1 << endl;     return 0;   }   