func_code_string: #include <bits/stdc++.h>   using namespace std;   int N, arr[1000000];   set<int> st;   int main() {     cin >> N;     if (N % 2 == 0) {       cout <<  NO ;       return 0;     }     for (int i = 1, b = 1, e = N * 2; i <= N; b += 2, e -= 2)       arr[i] = b, i++, arr[i] = e, i++;     for (int i = N + 1; i <= N * 2;) {       arr[i] = arr[i - N] + 1;       i++;       arr[i] = arr[i - N] - 1;       i++;     }     cout <<  YES n ;     for (int i = 1; i <= 2 * N; i++) cout << arr[i] <<    ;     cout <<   n ;   }   