Just do it

#include <bits/stdc++.h>
using namespace std;

int a[1010];

int main() {
    int n;
    cin>>n;
    for (int i = 0; i<n; i++) a[i] = i+1;
    vector<pair<int,int>> toSwap;
    for (int k=n-1; k> 0; k-=2) {
        toSwap.push_back({k-1,(k+1)/2});
    }
    for (int k = ((int)toSwap.size())-1;k>=0;k--) {
        swap(a[toSwap[k].first],a[toSwap[k].second]);
    }
    for (int i=0; i< n; i++) {
        cout << a[i] << " ";
    }
    cout<<"\n";
}

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