func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     ;     int n;     cin >> n;     if (n & 1) {       vector<int> v1, v2;       bool flag = true;       for (int i = 1; i <= 2 * n; i++) {         if (flag) {           v1.push_back(i);           flag = !flag;         } else {           v2.push_back(i);           flag = !flag;         }       }       for (int i = 1; i < n; i += 2) {         swap(v1[i], v2[i]);       }       cout <<  YES  << endl;       for (int i = 0; i < n; i++) cout << v1[i] <<    ;       for (int i = 0; i < n; i++) cout << v2[i] <<    ;     } else       cout <<  NO  << endl;     return 0;   }   