func_code_string: #include <bits/stdc++.h>   using namespace std;   using namespace std::chrono;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     int n;     cin >> n;     if (n % 2 == 0) {       cout <<  NO  << endl;       return 0;     }     cout <<  YES  << endl;     int arr[2 * n + 5];     for (int i = 1, j = 2 * n; i <= n; i++) {       if (i % 2 == 1) {         arr[i] = j;         j--;         arr[i + n] = j;         j--;       } else {         arr[i + n] = j;         j--;         arr[i] = j;         j--;       }     }     for (int i = 1; i <= 2 * n; i++) {       cout << arr[i] <<    ;     }     cout << endl;     return 0;   }   