func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     scanf( %d , &n);     int* x = new int[2 * n];     int odd = 0;     int even = n;     int len = n - 1;     for (int len = n - 1, i = 1; len > 0; len--, i++)       if (i % 2 == 1) {         x[odd] = i;         x[odd + len] = i;         odd++;       } else {         x[even] = i;         x[even + len] = i;         even++;       }     x[2 * n - 1] = n;     if (n % 2 == 0)       x[even] = n;     else       x[odd] = n;     int s = 0;     for (int i = 0; i < 2 * n; i++) printf( %d  , x[i]);     return 0;   }   