usaco-practice/cses/Permutations/index.cpp

#include <iostream>
using namespace std;

int main() {
  int n;
  cin >> n;

  if (n == 1) {
    cout << 1;
    return 0;
  }

  if (n == 2 || n == 3) {
    cout << "NO SOLUTION";
    return 0;
  }

  for (long long i = 1; i <= n; i++) {
    if (i % 2 == 0) {
      cout << i << " ";
    }
  }

  for (long long i = 1; i <= n; i++) {
    if (i % 2 == 1) {
      cout << i << " ";
    }
  }
}