func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     if (n % 2 == 0)       cout <<  NO  << endl;     else {       cout <<  YES  << endl;       cout << 1 <<    ;       for (int i = 4; i < 2 * n; i += 4) cout << i <<     << i + 1 <<    ;       for (int i = 2; i < 2 * n; i += 4) cout << i <<     << i + 1 <<    ;       cout << 2 * n << endl;     }     return 0;   }   