全是wa，救救我！！！

#include <iostream>
#include <vector>
using namespace std;
int main() {
    int n;
    cin >> n;
    vector<bool> arr(n + 1, false); 
    for (int i = 1; i <= n; ++i) {
        for (int j = i; j <= n; j += i) {
            arr[j] = !arr[j]; 
        }
    }
    for (int i = 1; i <= n; ++i) {
        if (!arr[i]) {
            cout<< i << " ";
        }
    }
    return 0;
}