docker_space/frontier_cs_3/examples/gpt5_medium_2.cpp

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

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int subtask, n;
    if (!(cin >> subtask >> n)) return 0;
    
    cout << -1;
    for (int i = 1; i <= n; ++i) {
        cout << ' ' << i;
    }
    cout << '\n';
    cout.flush();
    return 0;
}