Permutations

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>

using namespace std;
string s;

int main() {
	//freopen("cases.txt", "r", stdin);
	std::ios::sync_with_stdio(false);
	int n;
	cin >> n;

	if(n == 1)
		cout << "1" << endl;

	if (n == 2 || n == 3)
		cout << "NO SOLUTION" << endl;


	for (int i = 2; i <= n; i+=2) {
		cout << i << " ";
	}
	for (int i = 1; i <= n; i += 2) {
		cout << i << " ";
	}

	cout << endl;
	return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED

Test 16

Verdict: ACCEPTED

Test 17

Verdict: ACCEPTED

Test 18

Verdict: ACCEPTED

Test 19

Verdict: ACCEPTED

Test 20

Verdict: ACCEPTED

Test 21

Verdict: ACCEPTED